{"title":"Voltage Comparators — LM393, LM339, LM311 ICs","description":"\u003ch2\u003eVoltage Comparator ICs — LM393, LM339, LM311 \u0026amp; More\u003c\/h2\u003e\n\n\u003cp\u003eVoltage comparators are dedicated ICs designed for one purpose: comparing two analog voltages and producing a clean digital output. Unlike op-amps used as comparators, dedicated comparator ICs have open-collector outputs optimized for fast switching, direct TTL\/CMOS interface, and wired-OR bus connections. This collection covers the most widely used comparator ICs for sensor threshold detection, zero-crossing detection, window comparators, and analog-to-digital signal conversion.\u003c\/p\u003e\n\n\u003ch3\u003eAvailable Comparator ICs\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLM393 (Dual):\u003c\/strong\u003e 2 comparators, open-collector, 2V–36V single supply, 1.3μs response — the most popular dual comparator for sensor alarms and threshold detection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLM339 (Quad):\u003c\/strong\u003e 4 comparators, open-collector, 2V–36V — four channels in one DIP-14 package for multi-channel monitoring\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLM311 (Single):\u003c\/strong\u003e Single high-speed comparator, strobe input, faster than LM393 — for high-speed threshold detection and zero-crossing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLM2903 (Dual):\u003c\/strong\u003e Industrial-grade LM393 equivalent, −40°C to +125°C — for automotive and industrial applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eComparator vs Op-Amp — Why Use a Dedicated Comparator?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOpen-collector output:\u003c\/strong\u003e Directly drives LEDs, relays, and TTL\/CMOS logic without additional circuitry\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFaster response:\u003c\/strong\u003e Optimized for switching, not linear amplification — no phase compensation capacitor\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWired-OR:\u003c\/strong\u003e Multiple comparator outputs can share a single pull-up resistor for OR logic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide supply range:\u003c\/strong\u003e 2V–36V single supply — works from a 3V coin cell to a 24V industrial supply\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSensor threshold detection:\u003c\/strong\u003e Temperature, light, and pressure sensor alarm circuits\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eZero-crossing detection:\u003c\/strong\u003e AC waveform zero-crossing for phase control and power electronics\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWindow comparator:\u003c\/strong\u003e Detect if a signal is within a defined voltage window\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery monitor:\u003c\/strong\u003e Low-battery detection and alert circuits\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSchmitt trigger:\u003c\/strong\u003e Add hysteresis with positive feedback for noise-immune switching\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eArduino analog input:\u003c\/strong\u003e External comparator for faster response than internal ADC polling\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAll comparator ICs are new, original, and RoHS compliant. Available in DIP-8, DIP-14, and SOP-8 packages.\u003c\/p\u003e","products":[{"product_id":"lm358-dual-op-amp-module","title":"LM358 Dual Operational Amplifier Module — Comparator \u0026 Signal Conditioning","description":"\u003ch2\u003eLM358 Dual Operational Amplifier Module — Comparator \u0026amp; Signal Conditioning\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eLM358 dual op-amp module\u003c\/strong\u003e provides two independent operational amplifier channels for \u003cstrong\u003esignal conditioning, voltage comparison, and amplification\u003c\/strong\u003e in Arduino projects. The LM358 operates from a \u003cstrong\u003esingle 3V–32V supply\u003c\/strong\u003e — no dual supply needed — making it ideal for battery-powered and 5V Arduino applications. Includes an adjustable threshold potentiometer for comparator applications.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIC: \u003cstrong\u003eLM358\u003c\/strong\u003e | Channels: \u003cstrong\u003e2 independent op-amps\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSupply voltage: \u003cstrong\u003e3–32V single supply\u003c\/strong\u003e | Output: \u003cstrong\u003eAnalog \u0026amp; digital (comparator)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eGain bandwidth: \u003cstrong\u003e1MHz\u003c\/strong\u003e | Slew rate: \u003cstrong\u003e0.6V\/μs\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAdjustable threshold: \u003cstrong\u003eOn-board potentiometer\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompliance: \u003cstrong\u003eRoHS compliant\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSensor signal amplification and conditioning\u003c\/li\u003e\n\u003cli\u003eVoltage comparator with adjustable threshold\u003c\/li\u003e\n\u003cli\u003eVoltage follower and buffer circuits\u003c\/li\u003e\n\u003cli\u003eArduino analog signal processing\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":45670638551275,"sku":"","price":9.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/LM358-Amplifier-Module-1.jpg?v=1723009531"},{"product_id":"lm339-quad-voltage-comparator","title":"LM339 Quad Voltage Comparator","description":"\u003cp\u003e\u003cspan\u003e4 independent precision voltage comparators operate from single or split supply.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eDESCRIPTION\u003c\/h2\u003e\n\u003cp\u003eThe LM339 Quad Voltage Comparator contains four independent precision voltage comparators designed to operate from a single or split supply.\u003c\/p\u003e\n\u003ch2\u003ePACKAGE INCLUDES:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eLM339 Quad Voltage Comparator\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eKEY FEATURES OF LM339 QUAD VOLTAGE COMPARATOR:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eLow input offset voltage of 2.0 mV\u003c\/li\u003e\n\u003cli\u003eLow operating current of 0.8 mA\u003c\/li\u003e\n\u003cli\u003eOperates from a single positive power supply of 2 to 36V\u003c\/li\u003e\n\u003cli\u003eCan also operate from a split supply of ± 1.0 to ±18V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LM339 contains four differential comparators that are completely independent other than they share a common power supply connection.  It can operate on a wide single supply range of 2 to 36V or split supply range of +\/- 1 to 18V\u003cimg decoding=\"async\" class=\"alignright size-full wp-image-5034\" src=\"https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/LM339-Pin-Connections-2.jpg\" alt=\"LM339 Pin Connections\" width=\"334\" height=\"281\" srcset=\"https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/LM339-Pin-Connections-2.jpg 334w, https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/LM339-Pin-Connections-2-200x168.jpg 200w, https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/LM339-Pin-Connections-2-300x252.jpg 300w, https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/LM339-Pin-Connections-2-222x187.jpg 222w\" sizes=\"(max-width: 334px) 100vw, 334px\"\u003e\u003c\/p\u003e\n\u003cp\u003eAs the name implies, voltage comparators are used to compare one voltage to another and output either a logic HIGH or LOW level based on the results of that comparison.\u003c\/p\u003e\n\u003cp\u003eThe most common use for these parts is to monitor an analog signal to see if it goes beyond a threshold that requires some action to be taken.\u003c\/p\u003e\n\u003cp\u003eThese parts are commonly used on modules that provide an adjustment potentiometer to set when we want an output to trip HIGH or LOW based on some threshold being reached, usually from an analog sensor such as for temperature, light or sound.  In this case, the pot is setting a reference voltage on the comparator which is compared to the output voltage of the sensor.\u003c\/p\u003e\n\u003cp\u003eWhen monitoring an analog sensor, one option is to bring that analog sensor signal directly into an analog port on a uC and continually monitor it in the software.  Using a comparator on the other hand allows this monitoring to be done external to the uC and the digital output of the comparator can be brought into a digital pin that can be monitored more simply, similar to how a switch would be  monitored for being either ON or OFF.    The output can also be brought in on an interrupt pin so that no monitoring is required and the uC only takes an action when the comparator tells it to.  In many cases, using a comparator can remove the need for having a uC at all and the output can be used to directly drive a device such as a relay to take some action or LED to indicate some condition has been reached.\u003c\/p\u003e\n\u003ch3\u003eTheory of Operation\u003c\/h3\u003e\n\u003cp\u003eEach of the comparators in the LM339 have two inputs marked ‘+’ and ‘-‘.  The device simply compares the difference in voltage between these two input pins and sets the digital output accordingly.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIf the ‘+’ input voltage is higher than the ‘-‘ voltage, the output goes HIGH.\u003c\/li\u003e\n\u003cli\u003eIf the ‘-‘ input voltage is higher than the ‘+’ voltage, the output goes LOW\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you will be using the device with a uC, you should power the LM339 off the same voltage that the uC is running at so that the output is logic compatible with the uC.\u003c\/p\u003e\n\u003cp\u003eThe output is open collector which means that the LM339 will pull it to ground when it outputs a logic LOW, but when the output goes HIGH, an external pull-up resistor is needed to pull it HIGH.  In most applications, a pull-up resistor will be required on the output.  Most uC have the option to enable pull-up resistors on their digital inputs and so a physical resistor is generally not required.\u003c\/p\u003e\n\u003ch3\u003eNight Light Example Circuit\u003c\/h3\u003e\n\u003cp\u003eThe circuit shown here implements a simple night light using one of the comparators.\u003c\/p\u003e\n\u003cp\u003eThe LDR (Light Dependent Resistor) changes resistance with the amount of light falling on it.  As the amount of light increases, the resistance goes down.  Conversely, when the light intensity decreases the resistance goes up.\u003c\/p\u003e\n\u003cp\u003eThe LDR is in series with a 33K resistor forming a voltage divider.  The 33K value is not overly critical.  With strong lighting, the low resistance of the LDR will keep the voltage on the ‘-‘ pin low.  As the light decreases and the resistance goes up, the voltage will start to rise toward 5V and once it exceeds the voltage on the ‘+’ pin, the output will go LOW, thus turning on the LED night light.\u003c\/p\u003e\n\u003cp\u003eThe potentiometer can be used to adjust the voltage on the ‘+’ pin and therefore set the trip-point for when the comparator switches state.\u003c\/p\u003e\n\u003cp\u003e\u003cimg decoding=\"async\" class=\"wp-image-5038 size-full aligncenter entered lazyloaded\" src=\"https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339.jpg\" alt=\"Comparator Night Light lm339\" width=\"579\" height=\"412\" data-lazy-srcset=\"https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339.jpg 579w, https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339-400x285.jpg 400w, https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339-350x249.jpg 350w, https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339-300x213.jpg 300w, https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339-263x187.jpg 263w\" data-lazy-sizes=\"(max-width: 579px) 100vw, 579px\" data-lazy-src=\"https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339.jpg\" data-ll-status=\"loaded\" sizes=\"(max-width: 579px) 100vw, 579px\" srcset=\"https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339.jpg 579w, https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339-400x285.jpg 400w, https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339-350x249.jpg 350w, https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339-300x213.jpg 300w, https:\/\/protosupplies.com\/wp-content\/uploads\/2018\/05\/Comparator-Night-Light-lm339-263x187.jpg 263w\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe part comes in a DIP-8 package and is breadboard friendly.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNotes: \u003c\/em\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\u003ci\u003eNone\u003c\/i\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003chr\u003e\n\u003ch2\u003eTECHNICAL SPECIFICATIONS\u003c\/h2\u003e\n\u003ctable class=\"table table-hover\" width=\"839\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd width=\"145\"\u003e\u003cstrong\u003e Operational Ratings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd width=\"264\"\u003eV+\u003c\/td\u003e\n\u003ctd width=\"229\"\u003e2-36V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"145\"\u003e\u003c\/td\u003e\n\u003ctd width=\"264\"\u003eV+ \/ V-\u003c\/td\u003e\n\u003ctd width=\"229\"\u003e± 1.0V to ± 18V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"145\"\u003e\u003c\/td\u003e\n\u003ctd width=\"264\"\u003eTypical Sink Current\u003c\/td\u003e\n\u003ctd width=\"229\"\u003e16mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"145\"\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd width=\"264\"\u003e\u003c\/td\u003e\n\u003ctd width=\"229\"\u003eDIP-14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"145\"\u003e\u003cstrong\u003ePackage Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd width=\"264\"\u003e\u003c\/td\u003e\n\u003ctd width=\"229\"\u003ePlastic, thru-hole\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"145\"\u003e\u003cstrong\u003eMfr\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd width=\"264\"\u003e\u003c\/td\u003e\n\u003ctd width=\"229\"\u003eTI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd width=\"145\"\u003e\u003cstrong\u003eDatasheet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd width=\"264\"\u003e\u003c\/td\u003e\n\u003ctd width=\"229\"\u003e\u003cspan\u003e\u003cstrong\u003e\u003ca href=\"http:\/\/www.ti.com\/lit\/ds\/symlink\/lm139.pdf\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eLM339\u003c\/a\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c!----\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":45674465165547,"sku":"","price":1.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/LM339-Quad-Comparator-1.jpg?v=1723007412"},{"product_id":"lm393-dual-voltage-comparator-ic-dip8","title":"LM393 Dual Voltage Comparator IC DIP-8 – Open-Collector, 2V–36V Single Supply","description":"\u003ch2\u003eLM393 Dual Voltage Comparator IC – DIP-8\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eLM393\u003c\/strong\u003e is the industry-standard dual voltage comparator – a dedicated IC designed specifically for comparing two analog voltages and producing a digital output. With open-collector outputs, wide supply voltage range (2V–36V single supply), and the ability to interface directly with TTL and CMOS logic, the LM393 is the go-to comparator for sensor threshold detection, zero-crossing detection, and analog-to-digital signal conversion. Two comparator channels in one DIP-8 package.\u003c\/p\u003e\n\n\u003ch3\u003eElectrical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e LM393 \/ LM393N \/ LM393P\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage:\u003c\/strong\u003e DIP-8 (through-hole, 2.54mm pitch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComparators:\u003c\/strong\u003e 2 (dual, independent)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Type:\u003c\/strong\u003e Open-collector (requires external pull-up resistor)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupply Voltage:\u003c\/strong\u003e 2V – 36V (single) \/ ±1V – ±18V (dual)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput Common-Mode Range:\u003c\/strong\u003e GND to VCC−1.5V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eResponse Time:\u003c\/strong\u003e 1.3μs (typical, 5mV overdrive)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Sink Current:\u003c\/strong\u003e 16mA (max)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupply Current:\u003c\/strong\u003e 0.8mA (typical)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e 0°C to +70°C\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSensor threshold detection:\u003c\/strong\u003e Temperature, light, pressure sensor alarm circuits\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eZero-crossing detection:\u003c\/strong\u003e AC waveform zero-crossing for phase control\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWindow comparator:\u003c\/strong\u003e Detect if signal is within a voltage window\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery monitor:\u003c\/strong\u003e Low-battery detection and alert circuits\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSchmitt trigger:\u003c\/strong\u003e Add hysteresis with positive feedback for noise-immune switching\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eArduino analog comparator:\u003c\/strong\u003e External comparator for faster response than internal ADC\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × LM393 DIP-8 dual voltage comparator IC\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eTwo precision comparators, open-collector outputs, 2V–36V supply – the LM393 is the correct tool for any voltage comparison task in analog and mixed-signal circuit design.\u003c\/p\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":45674468901099,"sku":"","price":6.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/LM393-Dual-Comparator-1.jpg?v=1723007390"},{"product_id":"ua741-lm324-lm393-lm339-ne555-dip-analog-ic-starter-set-10pcs","title":"UA741 \/ LM324 \/ LM393 \/ LM339 \/ NE555 DIP Analog IC Starter Set – Pack of 10","description":"\u003ch2\u003eUA741 \/ LM324 \/ LM393 \/ LM339 \/ NE555 DIP Analog IC Starter Set – Pack of 10\u003c\/h2\u003e\n\n\u003cp\u003eThis \u003cstrong\u003eanalog IC starter set\u003c\/strong\u003e covers the five most essential general-purpose analog ICs in electronics – the building blocks that every electronics student, hobbyist, and engineer should have on hand. From the original op-amp (UA741) to the world's most popular timer (NE555), these ICs appear in virtually every analog electronics textbook and are the foundation of countless circuit designs. This 10-piece DIP pack is the ideal starter kit for electronics education and breadboard prototyping.\u003c\/p\u003e\n\n\u003ch3\u003eIncluded IC Descriptions\u003c\/h3\u003e\n\n\u003ch4\u003eUA741 (DIP-8) – Single General-Purpose Op-Amp\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eThe original op-amp – 1MHz GBW, ±15V dual supply\u003c\/li\u003e\n  \u003cli\u003eUse: Inverting\/non-inverting amplifier, integrator, differentiator, summing amplifier\u003c\/li\u003e\n  \u003cli\u003eBest for: Electronics education and legacy circuit repair\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM324N (DIP-14) – Quad Single-Supply Op-Amp\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e4 op-amps, single supply 3V–32V, input range to GND\u003c\/li\u003e\n  \u003cli\u003eUse: Multi-channel signal conditioning, comparators, active filters, battery circuits\u003c\/li\u003e\n  \u003cli\u003eBest for: Battery-powered analog circuits and sensor amplification\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM393N (DIP-8) – Dual Voltage Comparator\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e2 comparators, open-collector output, 2V–36V single supply\u003c\/li\u003e\n  \u003cli\u003eUse: Threshold detection, zero-crossing, window comparator, sensor alarms\u003c\/li\u003e\n  \u003cli\u003eBest for: Any voltage comparison application\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM339N (DIP-14) – Quad Voltage Comparator\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e4 comparators, open-collector output, 2V–36V single supply\u003c\/li\u003e\n  \u003cli\u003eQuad version of LM393 – 4 channels in one DIP-14 package\u003c\/li\u003e\n  \u003cli\u003eUse: Multi-channel threshold detection, battery monitoring, motor control\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eNE555 (DIP-8) – Timer IC\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eThe world's most popular IC – astable oscillator and monostable timer\u003c\/li\u003e\n  \u003cli\u003e4.5V–16V supply, 200mA output, 0.1Hz–500kHz frequency range\u003c\/li\u003e\n  \u003cli\u003eUse: LED flashers, PWM, tone generators, delay timers, debounce circuits\u003c\/li\u003e\n  \u003cli\u003eBest for: Any timing, oscillator, or PWM application\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy These Five ICs?\u003c\/h3\u003e\n\u003cp\u003eThese five ICs cover the fundamental analog functions: \u003cstrong\u003eamplification\u003c\/strong\u003e (UA741, LM324), \u003cstrong\u003ecomparison\u003c\/strong\u003e (LM393, LM339), and \u003cstrong\u003etiming\u003c\/strong\u003e (NE555). Together they can implement virtually any basic analog circuit – from sensor interfaces to oscillators to power control. They appear in every analog electronics textbook and are the first ICs every electronics student should learn.\u003c\/p\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e10 × DIP analog ICs (select variant: UA741, LM324N, LM393N, LM339N, or NE555)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe five essential analog ICs – op-amps, comparators, and timer in DIP packages for electronics education, breadboard prototyping, and general-purpose analog circuit design.\u003c\/p\u003e","brand":"Keszoox","offers":[{"title":"5PCS-LM339","offer_id":46991416459499,"sku":"14:4044226#20PCS-LM339","price":7.24,"currency_code":"USD","in_stock":true},{"title":"5PCS-LM393","offer_id":46991416492267,"sku":"14:350852#20PCS-LM393","price":5.2,"currency_code":"USD","in_stock":true},{"title":"5PCS-LM324","offer_id":46991416525035,"sku":"14:201659813#20PCS-LM324","price":7.04,"currency_code":"USD","in_stock":true},{"title":"5PCS-LM358","offer_id":46991416557803,"sku":"14:1202#20PCS-LM358","price":5.24,"currency_code":"USD","in_stock":true},{"title":"5PCS-NE555","offer_id":46991416590571,"sku":"14:351074#20PCS-NE555","price":5.24,"currency_code":"USD","in_stock":true},{"title":"5PCS-UA741CN","offer_id":46991416623339,"sku":"14:10#20PCS-UA741CN","price":7.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/ua741-lm324-lm393-lm339-ne555-ic.webp?v=1761890915"},{"product_id":"lm-series-sop8-ic-set-lm358-lm555-lm317-lm393-lm386-lm311-2pcs","title":"LM Series SOP-8 IC Set – LM358 \/ LM555 \/ LM317 \/ LM393 \/ LM386 \/ LM311 and More, Pack of 2","description":"\u003ch2\u003eLM Series SOP-8 IC Set – Pack of 2\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eLM series\u003c\/strong\u003e from Texas Instruments (and compatible manufacturers) represents the most comprehensive family of general-purpose analog ICs ever produced – covering op-amps, comparators, timers, voltage regulators, and audio amplifiers. This SOP-8 IC set covers the most essential LM series devices in surface-mount packages, providing a convenient way to stock multiple commonly needed ICs for PCB repair, prototyping, and production. This 2-piece pack is ideal for repair technicians and engineers who need SMD versions of classic LM series ICs.\u003c\/p\u003e\n\n\u003ch3\u003eAvailable IC Variants\u003c\/h3\u003e\n\n\u003ch4\u003eLM358 (SOP-8) – Dual Single-Supply Op-Amp\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e2 op-amps, single supply 3V–32V, input range to GND\u003c\/li\u003e\n  \u003cli\u003eUse: Sensor amplification, comparators, active filters, battery-powered circuits\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM555 (SOP-8) – Timer IC\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eClassic 555 timer in SMD package, astable and monostable modes\u003c\/li\u003e\n  \u003cli\u003eUse: Oscillators, PWM, one-shot timers, LED flashers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM317 (SOP-8) – Adjustable Voltage Regulator\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1.25V–37V adjustable output, 1.5A, SMD package\u003c\/li\u003e\n  \u003cli\u003eUse: Adjustable power supply, battery charger, LED driver\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM393 (SOP-8) – Dual Voltage Comparator\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e2 comparators, open-collector output, 2V–36V single supply\u003c\/li\u003e\n  \u003cli\u003eUse: Threshold detection, zero-crossing, window comparator\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM2904 \/ LM258DR (SOP-8) – Dual Op-Amp (Industrial Grade)\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLM358 equivalent with extended temperature range (−40°C to +85°C)\u003c\/li\u003e\n  \u003cli\u003eUse: Industrial signal conditioning, automotive electronics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM293DR \/ LM2903DR (SOP-8) – Dual Comparator (Industrial)\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLM393 equivalent with extended temperature range\u003c\/li\u003e\n  \u003cli\u003eUse: Industrial comparator applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM311 (SOP-8) – Single High-Speed Comparator\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSingle comparator, faster than LM393, strobe input\u003c\/li\u003e\n  \u003cli\u003eUse: High-speed threshold detection, zero-crossing detection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM386 (SOP-8) – Low-Voltage Audio Amplifier\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e0.25W–1W audio output, 4V–12V supply, 20–200× gain\u003c\/li\u003e\n  \u003cli\u003eUse: Portable speaker driver, intercom, Arduino audio output\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM4871MX (SOP-8) – 3W BTL Audio Amplifier\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3W BTL mono audio amplifier, 2.2V–5.5V supply\u003c\/li\u003e\n  \u003cli\u003eUse: Portable speaker, toy audio, USB-powered speaker\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM2675MX-ADJ (SOP-8) – Adjustable Step-Down Regulator\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSimple switcher buck converter, 1A, adjustable output\u003c\/li\u003e\n  \u003cli\u003eUse: Efficient DC-DC step-down from 8V–40V input\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eLM7171 (SOP-8) – High-Speed Op-Amp\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e200MHz GBW, 4100 V\/μs slew rate – high-speed video amplifier\u003c\/li\u003e\n  \u003cli\u003eUse: Video signal amplification, high-speed signal processing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 × LM series SOP-8 ICs (select variant from available options)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe essential LM series in SMD – op-amps, comparators, timers, regulators, and audio amplifiers in SOP-8 packages for PCB repair, prototyping, and production.\u003c\/p\u003e","brand":"Keszoox","offers":[{"title":"LM2903DR","offer_id":46991438053611,"sku":"14:496#LM2903DR","price":6.76,"currency_code":"USD","in_stock":true},{"title":"LM4871MX","offer_id":46991438086379,"sku":"14:366#LM4871MX","price":7.56,"currency_code":"USD","in_stock":true},{"title":"LM2675M-ADJ","offer_id":46991438119147,"sku":"14:1202#LM2675M-ADJ","price":35.0,"currency_code":"USD","in_stock":true},{"title":"LM358","offer_id":46991438151915,"sku":"14:350852#LM358","price":6.72,"currency_code":"USD","in_stock":true},{"title":"LM2904","offer_id":46991438184683,"sku":"14:29#LM2904","price":6.68,"currency_code":"USD","in_stock":true},{"title":"LM393","offer_id":46991438217451,"sku":"14:10#LM393","price":6.76,"currency_code":"USD","in_stock":true},{"title":"LM311","offer_id":46991438250219,"sku":"14:173#LM311","price":8.04,"currency_code":"USD","in_stock":true},{"title":"LM293DR","offer_id":46991438282987,"sku":"14:94#LM293DR","price":6.72,"currency_code":"USD","in_stock":true},{"title":"LM386","offer_id":46991438315755,"sku":"14:193#LM386","price":6.76,"currency_code":"USD","in_stock":true},{"title":"LM258DR","offer_id":46991438348523,"sku":"14:175#LM258DR","price":6.68,"currency_code":"USD","in_stock":true},{"title":"LM317","offer_id":46991438381291,"sku":"14:201659813#LM317","price":6.76,"currency_code":"USD","in_stock":true},{"title":"LM555","offer_id":46991438414059,"sku":"14:351074#LM555","price":8.32,"currency_code":"USD","in_stock":true},{"title":"LM7171","offer_id":46991438446827,"sku":"14:4044226#LM7171","price":12.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/lm-series-sop8-ic-chip-set-lm2675mx-adj-lm358-lm555-lm7171-lm317-lm393-lm2904-lm293dr-lm311-lm258dr-lm386-lm4871mx-lm2903dr.webp?v=1761879452"},{"product_id":"lm393p-lm393n-dual-voltage-comparator-dip8-2-36v-open-collector-5pack","title":"LM393P \/ LM393N Dual Voltage Comparator IC — DIP-8, 2–36V, Open-Collector (5-Pack)","description":"\u003ch2\u003eLM393P \/ LM393N Dual Voltage Comparator — DIP-8, 2–36V, Open-Collector Output (5-Pack)\u003c\/h2\u003e\u003cp\u003eThe LM393P and LM393N are dual independent voltage comparator ICs in a DIP-8 through-hole package. With a wide supply voltage range of 2V to 36V (single supply) or ±1V to ±18V (dual supply), open-collector outputs, and a 1.3μs response time, they are the industry-standard comparators for threshold detection, zero-crossing detection, window comparators, and analog-to-digital signal conversion in both 3.3V and 5V embedded systems.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eDIP-8 (through-hole)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComparators per IC\u003c\/td\u003e\n\u003ctd\u003e2 (independent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage (single)\u003c\/td\u003e\n\u003ctd\u003e2V – 36V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage (dual)\u003c\/td\u003e\n\u003ctd\u003e±1V – ±18V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eOpen-collector (requires pull-up resistor)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResponse Time\u003c\/td\u003e\n\u003ctd\u003e1.3μs typ.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Offset Voltage\u003c\/td\u003e\n\u003ctd\u003e2mV typ., 5mV max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Common-Mode Range\u003c\/td\u003e\n\u003ctd\u003eGND to VCC−1.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0°C to +70°C (LM393P) \/ -40°C to +85°C (LM393N)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e5 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eLM393 vs LM741 vs LM358 — Comparator vs Op-Amp\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eIC\u003c\/th\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003cth\u003eOutput\u003c\/th\u003e\n\u003cth\u003eBest For\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLM393\u003c\/td\u003e\n\u003ctd\u003eVoltage comparator\u003c\/td\u003e\n\u003ctd\u003eOpen-collector\u003c\/td\u003e\n\u003ctd\u003eThreshold detection, digital output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLM741\u003c\/td\u003e\n\u003ctd\u003eOp-amp (used as comparator)\u003c\/td\u003e\n\u003ctd\u003ePush-pull (limited swing)\u003c\/td\u003e\n\u003ctd\u003eAmplification; slow comparator use only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLM358\u003c\/td\u003e\n\u003ctd\u003eOp-amp (used as comparator)\u003c\/td\u003e\n\u003ctd\u003ePush-pull\u003c\/td\u003e\n\u003ctd\u003eSingle-supply amplifier; slow comparator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eWhy Choose LM393?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue comparator design\u003c\/strong\u003e — faster response (1.3μs) than op-amps used as comparators\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen-collector output\u003c\/strong\u003e — wire-OR capability, directly drives optocouplers, relays, and logic inputs with pull-up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2–36V single supply\u003c\/strong\u003e — works from 3.3V MCU supply to 24V industrial supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput range includes GND\u003c\/strong\u003e — can compare signals near ground on single supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5-pack value\u003c\/strong\u003e — sufficient for multiple comparator circuit builds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible With \/ Common Use Cases\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eArduino analog threshold detection\u003c\/strong\u003e: Compare sensor voltage to reference, output digital HIGH\/LOW to Arduino GPIO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero-crossing detector\u003c\/strong\u003e: Detect AC mains zero-crossing for phase control (with optocoupler isolation)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWindow comparator\u003c\/strong\u003e: Two LM393 comparators detect if voltage is within a defined range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery low-voltage alarm\u003c\/strong\u003e: Trigger LED or buzzer when battery drops below threshold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor current sensing\u003c\/strong\u003e: Compare shunt resistor voltage to reference for overcurrent protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight\/dark detector\u003c\/strong\u003e: LDR + LM393 comparator for automatic light switching\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Why does LM393 output need a pull-up resistor?\u003c\/strong\u003e\u003cbr\u003eA: LM393 has an open-collector output — the output transistor can only pull LOW (sink current). To get a HIGH output, an external pull-up resistor (typically 10kΩ) to VCC is required. Without a pull-up, the output floats when the comparator output is HIGH. Connect pull-up to the same voltage as your logic supply (3.3V or 5V).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can LM393 compare signals above its supply voltage?\u003c\/strong\u003e\u003cbr\u003eA: No — both inputs must stay within the common-mode input range (GND to VCC−1.5V). For signals above VCC, use a resistor divider to scale the signal down before the comparator input. Never exceed VCC on the input pins.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the difference between LM393P and LM393N?\u003c\/strong\u003e\u003cbr\u003eA: Both are DIP-8 dual comparators with identical electrical specifications. LM393P is rated 0°C to +70°C (commercial grade); LM393N is rated -40°C to +85°C (industrial grade). For outdoor or industrial applications, use LM393N.\u003c\/p\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e5× LM393P \/ LM393N Dual Voltage Comparator IC (DIP-8)\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991460106475,"sku":"\u003cnone\u003e","price":4.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/lm393p-lm393n-dip-8-dual-comparator-ic-chipset.webp?v=1761794929"}],"url":"https:\/\/keszoox.com\/collections\/voltage-comparator-ics.oembed","provider":"Keszoox","version":"1.0","type":"link"}