SMPS Controller

Obsolete as of 14-Sep-2013

    The KA3842AC/KA3842AE are fixed PWM controller for Off Line and DC to DC converter applications. The internal circuits include UVLO, low start up current circuit, temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totem pole output for driving a POWER MOSFET. Also KA3842AC/KA3842AE provides low start up current below 0.3mA and short shutdown delay time typ. 100ns. The KA3842AC/KA3842AE has UVLO threshold of 16V(on) and 10V(off). The KA3842AC/KA3842AE can operate within 100% duty cycle.


    • Low Start Current 0.2mA (Typ)
    • Operating Range up to 500kHz
    • Cycle by Cycle Current Limiting
    • Under Voltage Lock Out With Hysteresis
    • Short Shutdown Delay Time: Typ.100ns
    • High Current Totem-Pole Output
    • Output Swing Limiting: 22V
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    Product Product &
    Eco Status
    Replacement Part Number Packing Method Convention Package Marking
    KA3842ACS Obsolete as of 14-Sep-2013
    ROHS Compliant as of 27-Feb-2006

    MDIP 8L  -  Details
    0.13 x 0.25 x 0.381mm,  RAIL

    PDF MDIP 8L  Drawing
    Last Update: Jan 2015 PDF Dip 8 Tube Packing drawing
    Last Update: Oct 2015 PDF DIP 8 TUBE PACKING DRAWING
    Last Update: May 2013
    Line 1$Y (Fairchild logo)
    &Z (Plant Code)
    &2 (2-Digit Date Code)

    Line 2KA3842A

    FIT 4.4 @55°C
    change temp

    RƟJA 95°C/W

    PDF RoHS IPC1752
    • Other Consumer Electronics
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