UC3842 Current-Mode PWM Controller IC
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Prices updated: 12 Oct 2026
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About this product
The UC3842 is a fixed-frequency current-mode PWM controller from the UC1842/3/4/5 family. It is used in off-line and DC-DC switching power supplies, with built-in undervoltage lockout, a precision reference, current limiting and a totem-pole output for driving N-channel MOSFETs.
Specifications
- Control method
- Current-mode PWM / PWM بالتحكم بالتيار
- Operating frequency
- Fixed frequency / تردد ثابت
- Startup current
- Less than 1 mA / أقل من 1 mA
- Output stage
- Totem-pole for N-channel MOSFET / لمفتاح MOSFET من النوع N
- Protection
- Undervoltage lockout, current limit / قفل انخفاض الجهد وتحديد التيار
- Package
- 8-pin DIP / SOIC
Frequently asked questions
What circuits is the UC3842 used in?
It is used in off-line flyback or forward switch-mode power supplies and in DC-DC converters. Its output drives an external N-channel MOSFET, usually through a gate resistor.
How do the UC1842/3/4/5 variants differ?
The variants differ mainly in undervoltage lockout thresholds and maximum duty cycle. Check the datasheet for the exact version before replacing one with another.
