{"product_id":"uc3842-sop8-current-mode-pwm-controller-ic-smd","title":"UC3842A\/B SOP-8 Current-Mode PWM Controller IC UC3842 SMD (5-Pack)","description":"\u003ch2\u003eUC3842A\/B SOP-8 Current-Mode PWM Controller IC — 500kHz\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eUC3842\u003c\/strong\u003e is a high-performance current-mode PWM controller IC in a compact \u003cstrong\u003eSOP-8\u003c\/strong\u003e surface-mount package. With a \u003cstrong\u003e500kHz\u003c\/strong\u003e maximum switching frequency, \u003cstrong\u003e1A peak gate drive\u003c\/strong\u003e, and built-in UVLO (undervoltage lockout), it is the go-to controller for single-ended flyback and forward converter designs in SMPS repair and new designs alike.\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\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eUC3842A \/ UC3842B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eSOP-8 (SMD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage (VCC)\u003c\/td\u003e\n\u003ctd\u003e10V – 30V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUVLO Start Threshold\u003c\/td\u003e\n\u003ctd\u003e16V (UC3842A) \/ 16V (UC3842B)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUVLO Stop Threshold\u003c\/td\u003e\n\u003ctd\u003e10V (UC3842A) \/ 10V (UC3842B)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Oscillator Frequency\u003c\/td\u003e\n\u003ctd\u003e500kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGate Drive Output\u003c\/td\u003e\n\u003ctd\u003e1A peak source\/sink\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReference Voltage\u003c\/td\u003e\n\u003ctd\u003e5V ±1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Sense Input\u003c\/td\u003e\n\u003ctd\u003e1V threshold\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\u003eUC3842A vs UC3842B\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eUC3842A\u003c\/th\u003e\n\u003cth\u003eUC3842B\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUVLO Hysteresis\u003c\/td\u003e\n\u003ctd\u003e6V\u003c\/td\u003e\n\u003ctd\u003e6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Duty Cycle\u003c\/td\u003e\n\u003ctd\u003e100%\u003c\/td\u003e\n\u003ctd\u003e100%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemp Range\u003c\/td\u003e\n\u003ctd\u003e0°C to +70°C\u003c\/td\u003e\n\u003ctd\u003e−40°C to +85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eWhy Choose UC3842?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent-Mode Control\u003c\/strong\u003e — Inherent cycle-by-cycle current limiting for robust protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1A Gate Drive\u003c\/strong\u003e — Directly drives power MOSFETs without external buffer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500kHz Operation\u003c\/strong\u003e — Enables smaller transformer and filter components\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in UVLO\u003c\/strong\u003e — Prevents operation below safe supply voltage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustry Standard\u003c\/strong\u003e — Compatible with UC2842, UC1842, KA3842, NCP3842\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFlyback SMPS for chargers, adapters, and LED drivers\u003c\/li\u003e\n\u003cli\u003eForward converter power supplies\u003c\/li\u003e\n\u003cli\u003eATX power supply repair (common UC3842 failure point)\u003c\/li\u003e\n\u003cli\u003eDC-DC converter modules\u003c\/li\u003e\n\u003cli\u003eIndustrial power supply design\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: What’s the difference between UC3842 and UC3843?\u003c\/strong\u003e\u003cbr\u003eA: UC3843 has a lower UVLO threshold (8.5V start \/ 7.6V stop) and is better for low-voltage bus applications. UC3842 suits higher-voltage offline supplies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can UC3842 SOP-8 replace the DIP-8 version?\u003c\/strong\u003e\u003cbr\u003eA: Electrically yes, but requires SMD PCB footprint. Use a SOP-8 to DIP-8 adapter for through-hole board repair.\u003c\/p\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e5× UC3842A\/B SOP-8 Current-Mode PWM Controller IC\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991484846315,"sku":"\u003cnone\u003e","price":6.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/uc3842-sop8-pwm-ic.webp?v=1761543596","url":"https:\/\/keszoox.com\/products\/uc3842-sop8-current-mode-pwm-controller-ic-smd","provider":"Keszoox","version":"1.0","type":"link"}