component

UC3842BNG

Public Made by Adom

by adom

onsemi AC-DC Controllers & Regulators, PDIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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UC3842BNG

onsemi · AC-DC Controllers & Regulators · PDIP-8

UC3842BNG from onsemi, in a PDIP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 Compensation output Error Amplifier output made available for loop compensation.
2 Voltage Feedback input Inverting input of the Error Amplifier, normally connected to the switching power supply output through a resistor divider (input range -0.3 to +5.5 V).
3 Current Sense input Receives a voltage proportional to inductor current, which the PWM uses to terminate output switch conduction (input range -0.3 to +5.5 V).
4 RT/CT passive Oscillator frequency and maximum output duty cycle are set by resistor RT to Vref and capacitor CT to ground, with operation to 500 kHz possible.
5 GND power_in Combined control circuitry and power ground.
6 Output output Totem pole output that directly drives the gate of a power MOSFET, sourcing and sinking peak currents up to 1.0 A.
7 VCC power_in Positive supply of the control IC (maximum 30 V).
8 Vref power_out 5.0 V reference output that provides charging current for capacitor CT through resistor RT.

Key specifications

Parameter Value
Manufacturer onsemi
Package PDIP-8
Category Power Management ICs
Pins 8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Reference Output Voltage Vref 4.9 5 5.1 V IO = 1.0 mA, TJ = 25°C 3
Line Regulation Regline 2 20 mV VCC = 12 V to 25 V 3
Load Regulation Regload 3 25 mV IO = 1.0 mA to 20 mA 3
Temperature Stability TS 0.2 mV/°C 3
Total Output Variation Vref 4.82 5.18 V over line, load, and temperature 3
Long Term Stability S 5 mV TA = 125°C for 1000 Hours 3
Output Short Circuit Current ISC -30 -85 -180 mA 3
Oscillator Frequency fOSC 49 52 55 kHz TJ = 25°C 3
Oscillator Frequency over temperature fOSC 48 56 kHz TA = Tlow to Thigh 3
Oscillator Frequency fOSC 225 250 275 kHz TJ = 25°C (RT = 6.2 k, CT = 1.0 nF) 3
Frequency Change with Voltage fOSC/V 0.2 1 % VCC = 12 V to 25 V 3
Frequency Change with Temperature fOSC/T 0.5 % TA = Tlow to Thigh 3
Oscillator Voltage Swing VOSC 1.6 V Peak-to-Peak 3
Discharge Current Idischg 7.8 8.3 8.8 mA VOSC = 2.0 V, TJ = 25°C 3
Discharge Current over temperature Idischg 7.6 8.8 mA VOSC = 2.0 V, TA = Tlow to Thigh, UC384XB 3
Voltage Feedback Input VFB 2.42 2.5 2.58 V VO = 2.5 V 3
EA Input Bias Current IIB -0.1 -2 µA VFB = 5.0 V 3
Open Loop Voltage Gain AVOL 65 90 dB VO = 2.0 V to 4.0 V 3
Unity Gain Bandwidth BW 0.7 1 MHz TJ = 25°C 3
EA Power Supply Rejection Ratio PSRR 60 70 dB VCC = 12 V to 25 V 3
EA Output Sink Current ISink 2 12 mA VO = 1.1 V, VFB = 2.7 V 3
EA Output Source Current ISource -0.5 -1 mA VO = 5.0 V, VFB = 2.3 V 3
EA Output Voltage Swing High VOH 5 6.2 V RL = 15 k to ground, VFB = 2.3 V 3
EA Output Voltage Swing Low VOL 0.8 1.1 V RL = 15 k to Vref, VFB = 2.7 V 3
Current Sense Input Voltage Gain AV 2.85 3 3.15 V/V UC384XB 3
Maximum Current Sense Input Threshold Vth 0.9 1 1.1 V UC384XB 3
Current Sense PSRR PSRR 70 dB VCC = 12 V to 25 V 3
Current Sense Input Bias Current IIB -2 -10 µA 3
Propagation Delay tPLH(In/Out) 150 300 ns Current Sense Input to Output 3
Output Voltage Low State VOL 0.1 0.4 V ISink = 20 mA 4
Output Voltage Low State VOL 1.6 2.2 V ISink = 200 mA 4
Output Voltage High State VOH 13 13.5 V ISource = 20 mA 4
Output Voltage High State VOH 12 13.4 V ISource = 200 mA 4
Output Voltage with UVLO Activated VOL(UVLO) 0.1 1.1 V VCC = 6.0 V, ISink = 1.0 mA 4
Output Voltage Rise Time tr 50 150 ns CL = 1.0 nF, TJ = 25°C 4
Output Voltage Fall Time tf 50 150 ns CL = 1.0 nF, TJ = 25°C 4
Startup Threshold (VCC) UCX842B Vth 14.5 16 17.5 V UCX842B 4
Minimum Operating Voltage After Turn-On UCX842B VCC(min) 8.5 10 11.5 V UCX842B 4
Maximum Duty Cycle DC(max) 94 96 % UC384XB 4
Minimum Duty Cycle DC(min) 0 % 4
Power Supply Current Startup ICC + IC 0.3 0.5 mA Startup, VCC = 14 V for UCX842B 4
Power Supply Current Operating ICC + IC 12 17 mA 4
Power Supply Zener Voltage VZ 30 36 V ICC = 25 mA 4
Bias and Driver Voltages VCC, VC 30 V Zero series impedance 2
Total Power Supply and Zener Current ICC + IZ 30 mA 2
Output Current, Source or Sink IO 1 A 2
Output Energy W 5 J Capacitive load per cycle 2
Current Sense and Voltage Feedback Inputs Vin -0.3 5.5 V 2
Error Amp Output Sink Current IO 10 mA 2
Maximum Power Dissipation PD 1.25 W N Suffix PDIP, TA = 25°C 2
Thermal Resistance, Junction-to-Air RθJA 100 °C/W N Suffix, Case 626 2
Operating Junction Temperature TJ 150 °C 2
Operating Ambient Temperature TA 0 70 °C UC3842B 2
Storage Temperature Range Tstg -65 150 °C 2

CAD (KiCad official)

  • Symbol: UC3842BNG
  • Footprint: Package_DIP:DIP-8_W7.62mm
  • 3D model: PDIP-8 (KiCad packages3D, STEP)
  • 3D model files: uc3842bng-etched.step / uc3842bng-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3842bng.step / uc3842bng.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: onsemi datasheet (21 pp, sha256 0a568e6a851b8837, retrieved 2026-10-22, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF