{"product_id":"tl431-tl431a-cj431-sot-23-shunt-voltage-reference-ic-smd-25pcs","title":"TL431 TL431A CJ431 SOT-23 Shunt Voltage Reference IC SMD (25-Pack)","description":"\u003ch2\u003eTL431 \/ TL431A \/ CJ431 — SOT-23 Adjustable Shunt Voltage Reference\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eTL431\u003c\/strong\u003e is a precision programmable shunt voltage reference widely used in SMPS feedback loops, voltage regulators, and ADC reference circuits. This listing provides \u003cstrong\u003e25 pieces\u003c\/strong\u003e in compact \u003cstrong\u003eSOT-23 SMD\u003c\/strong\u003e package — new and original parts.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Numbers\u003c\/td\u003e\n\u003ctd\u003eTL431 \/ TL431A \/ CJ431\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eSOT-23 (3-pin SMD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e2.5V – 36V (adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference Voltage (Vref)\u003c\/td\u003e\n\u003ctd\u003e2.495V (typ.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCathode Current\u003c\/td\u003e\n\u003ctd\u003e1mA – 100mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Coefficient\u003c\/td\u003e\n\u003ctd\u003e≤50 ppm\/°C (TL431A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0°C to +70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e25 PCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch3\u003eWhy Choose TL431 SOT-23?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003eIndustry-standard reference\u003c\/strong\u003e — used in virtually every SMPS feedback circuit\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eCompact SOT-23 package\u003c\/strong\u003e — ideal for space-constrained PCB designs\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eAdjustable output\u003c\/strong\u003e — set any voltage from 2.5V to 36V with two resistors\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eNew \u0026amp; original\u003c\/strong\u003e — genuine TL431A grade, not remarked\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e25-pack value\u003c\/strong\u003e — cost-effective for prototyping and production\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eCompatible With \/ Works With\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSMPS optocoupler feedback (PC817 + TL431 classic topology)\u003c\/li\u003e\n\u003cli\u003eLM358, LM324 op-amp comparator circuits\u003c\/li\u003e\n\u003cli\u003eArduino ADC external reference (2.5V fixed)\u003c\/li\u003e\n\u003cli\u003eRaspberry Pi voltage monitoring circuits\u003c\/li\u003e\n\u003cli\u003eBattery charger termination circuits\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSMPS Feedback Loop\u003c\/strong\u003e — flyback\/forward converter output regulation via optocoupler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Voltage Reference\u003c\/strong\u003e — ADC reference for STM32, ATmega, ESP32\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOvervoltage Protection\u003c\/strong\u003e — crowbar circuit with SCR or thyristor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLED Driver Constant Current\u003c\/strong\u003e — simple 2-resistor current sink\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Charger\u003c\/strong\u003e — charge termination voltage detection\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the difference between TL431 and TL431A?\u003c\/strong\u003e\u003cbr\u003eA: TL431A has tighter tolerance on Vref (±0.5% vs ±2%), making it preferred for precision applications. Both are electrically interchangeable in most circuits.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is CJ431 a direct replacement for TL431?\u003c\/strong\u003e\u003cbr\u003eA: Yes. CJ431 is a Chinese-manufactured equivalent with identical pinout and electrical characteristics, fully interchangeable in standard circuits.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can TL431 be used as a 5V regulator?\u003c\/strong\u003e\u003cbr\u003eA: Yes, with two resistors (R1 and R2) to set the output: Vout = Vref × (1 + R1\/R2). For 5V: use R1=100kΩ, R2=40.2kΩ.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e25× TL431 \/ TL431A \/ CJ431 SOT-23 Shunt Voltage Reference IC\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991477637355,"sku":"\u003cnone\u003e","price":4.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/tl431-431-cj431-sot23-shunt-voltage-reference-ic.webp?v=1761629016","url":"https:\/\/keszoox.com\/products\/tl431-tl431a-cj431-sot-23-shunt-voltage-reference-ic-smd-25pcs","provider":"Keszoox","version":"1.0","type":"link"}