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UC3842AP-S08-R

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UTC Unisonic Tech AC-DC Controllers And Regulators, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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UC3842AP-S08-R

UTC Unisonic Tech · AC-DC Controllers And Regulators · SOIC-8

UC3842AP-S08-R from UTC Unisonic Tech, in a SOIC-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 COMP output Error amplifier output for loop compensation (sink current max 10 mA, source about 0.5 mA); pulling it below two diode drops above ground shuts down the output.
2 VFB input Error amplifier inverting input (feedback voltage, 2.5 V nominal) with an analog input range of -0.3 to +6.3 V.
3 Current Sense input Current sense comparator input with 1 V maximum trip level (peak current = 1.0 V/Rs) and an analog input range of -0.3 to +6.3 V; raising it above 1 V shuts down the output.
4 RT/CT passive Oscillator timing pin where the external RT to VREF and CT to ground set the fixed frequency (500 kHz operation max, 52 kHz typical at 10 kΩ/3.3 nF).
5 GND power_in Ground; timing and bypass capacitors should be connected close to this pin in a single-point ground.
6 Output output High-current totem-pole output driving a MOSFET gate directly, with ±1 A peak output current, and high impedance during under-voltage lockout (shunt to GND with a bleeder resistor).
7 VCC power_in Positive supply with 30 V maximum from a low impedance source (self-limiting for ICC<30 mA), with UVLO start threshold 16 V typ and 10 V typ minimum operating for UC3842A.
8 VREF power_out Internally trimmed 5 V reference output (4.9 to 5.1 V at 1 mA) with 100 mA typical short-circuit current.

Key specifications

Parameter Value
Manufacturer UTC Unisonic Tech
Package SOIC-8
Category Power Management (PMIC)
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
Supply Voltage (Low Impedance Source) VCC 30 V Low Impedance Source 3
Analog Inputs (Pin 2,3) VI(ANA) -0.3 6.3 V Pin 2,3 3
Output Current (Peak) IO(PEAK) -1 1 A 3
Error Amplifier Output Sink Current ISINK(EA) 10 mA 3
Output Energy (Capacity Load) 5 μJ Capacity Load 3
Power Dissipation (SOP-8) PD 800 mW TA≦25℃ 3
Junction Temperature TJ 150 ℃ 3
Storage Temperature TSTG -65 150 ℃ 3
Output Voltage VREF 4.9 5 5.1 V TJ=25℃,IOUT=1mA 3
Line Regulation ΔVREF 6 20 mV 12≦VIN25V 3
Load Regulation ΔVREF 6 25 mV 1≦IOUT=20mA 3
Temperature Stability 0.2 0.4 mV/℃ 3
Total Output Variation 4.82 5.18 V Line, Load, Temp 3
Long Term Stability 5 25 mV TA=25℃,1000Hrs 3
Output Short Circuit ISC -30 -100 -180 mA 3
Initial Accuracy f 47 52 57 kHz TJ=25℃ 3
Voltage Stability Δf/ΔVCC 0.2 1 % 12≦VCC≦25V 3
Temperature Stability (oscillator) 5 % TMIN≦TA≦TMAX 3
Input Voltage VI(EA) 2.42 2.5 2.58 V VPIN1=2.5V 3
Input Bias Current II(BIAS) -0.3 -2 μA 3
Open Loop Voltage Gain AVOL 60 90 dB 2V≦VOUT≦4V 3
Unity Gain Bandwidth 0.7 1 MHz TJ=25℃ 3
Power Supply Rejection Ratio (error amplifier) 60 70 dB I2≦VCC≦25V 3
Output Sink Current IO(SINK) 2 6 mA VPIN2=2.7V,VPIN1=1.1V 3
Output Source Current IO(SOURCE) -0.5 -0.8 mA VPIN2=2.3V,VPIN1=5V 3
VOUT High VOH 5 6 V VPIN2=2.3V, RL=15kΩ to GND 3
VOUT Low VOL 0.7 1.1 V VPIN2=2.7V,VPIN1=1.1V 3
Gain GV 2.85 3 3.15 V/V Note 2, 3 4
Maximum Input Signal VI(MAX) 0.9 1 1.1 V VPIN1=5V (Note 2) 4
Power Supply Rejection Ratio (current sense) 70 dB 12V≦VCC≦25V 4
Input Bias Current (current sense) IBIAS -2 -10 μA 4
Delay to Output 150 300 ns VPIN3=0 to 2V 4
Output Level Low VOL 0.1 0.4 V IO(SINK)=20mA 4
Output Level Low VOL 1.5 2.2 V IO(SINK)=200mA 4
Output Level High VOH 13 13.5 V IO(SOURCE)=20mA 4
Output Level High VOH 12 13.5 V IO(SOURCE)=200mA 4
Rise Time tR 50 150 ns TJ=25℃,CL=1nF 4
Fall Time tF 50 150 ns TJ=25℃,CL=1nF 4
Start Threshold (3842A) VTH(ST) 14.5 16 17.5 V 3842A variant 4
Minimum Operating Voltage (3842A) VOPR(MIN) 8.5 10 11.5 V After Turn On 4
Duty Cycle MAX D(MAX) 95 97 100 % 4
Duty Cycle MIN D(MIN) 0 % 4
Start-up Current IST 0.12 0.3 mA 4
Operating Supply Current ICC(OPR) 11 17 mA VPIN2=VPIN3=0V 4
Amplitude (peak to peak) VOSC 1.7 V VPIN4 peak to peak 3
VCC Zener Voltage Vz 34 V ICC=25mA 4
Output Noise Voltage VOSC 50 μV 10Hz≦f≦10kHz,TJ=25℃ 3

CAD (KiCad official)

  • Symbol: UC3842AP-S08-R
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: uc3842ap-s08-r-etched.step / uc3842ap-s08-r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3842ap-s08-r.step / uc3842ap-s08-r.glb are the bare package body.

Provenance

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

  • Datasheet: UTC Unisonic Tech datasheet (9 pp, sha256 156578ac13622df2, retrieved 2026-10-19, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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