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UC3869AG-S08-R

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

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UC3869AG-S08-R

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

UC3869AG-S08-R from UTC Unisonic Tech, in a SOP-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 RT input Connected through an NTC resistor to ground for over-temperature shutdown; the RT pin sources about 100 µA (93 to 107 µA at VRT=0.9V) and OTP trips when the RT voltage falls below about 1.04 V (0.98 to 1.10 V).
2 FB input Feedback input whose voltage, together with the CS pin current-sense signal, sets the PWM duty cycle; the datasheet gives an open-loop voltage of 5.4 V and a PWM input gain of 3 V/V.
3 CS input Current sense input for cycle-by-cycle current limiting, with a peak current flat threshold of 0.92 V and a valley threshold of 0.57 to 0.67 V, and 200 to 550 ns leading edge blanking.
4 GND power_in Ground reference for the controller.
5 GATE output Totem-pole gate driver output for the power MOSFET, with a typical output high level of 9 V and output low level of 1 V at 20 mA with VDD=15 V, and an internal 16 V clamp for gate protection.
6 VDD power_in Power supply pin; the recommended supply range is 10 to 24 V, with a start threshold of 16 to 21 V, minimum operating voltage of 6 to 8 V, and a zener clamp of 32 to 36 V.
7 NC unconnected No connection.
8 HV input Connected to the line input or bulk capacitor through resistors for start-up; the high-voltage pin absolute maximum rating is -0.3 to 500 V and it supplies about 0.25 mA to charge VDD during power-on.

Key specifications

Parameter Value
Manufacturer UTC Unisonic Tech
Package SOP-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
VDD DC Supply Voltage VDD 36 V 4
High-Voltage Pin, HV -0.3 500 V 4
VDD DC Clamp Current 10 mA 4
FB Input Voltage -0.3 7 V 4
CS Input Voltage -0.3 7 V 4
RT Input Voltage -0.3 7 V 4
Operating Junction Temperature TJ -40 150 °C 4
Storage Temperature TSTG -55 160 °C 4
VDD Supply Voltage (recommended) VDD 10 24 V 4
Operating Ambient Temperature TA -20 85 °C 4
Operation Current I_VDD_Operation 0.8 1.8 mA VFB=3V 4
Start Up Current (leakage into VDD) Istartup 2 15 μA VDD=UVLO(OFF)-1V, Measure Leakage Current into VDD 4
Start Threshold Voltage VTHD(ON) 16 18 21 V 4
Min. Operating Voltage VDD(MIN) 6 7 8 V 4
VCC Zener Clamp Voltage VCC(clamp) 32 34 36 V IVDD=5mA 4
Over Voltage Protection Voltage OVP(ON) 25 27 29 V FB=4V Ramp up VDD Until Gate Clock is Off 4
Max Duty Cycle 70 78 90 % VFB=3.5V, VSENSE=0 4
Power Limiting Debounce Time TD_PL 60 88 120 mS 4
Leading Edge Blanking Time T_blanking 200 350 550 ns 5
Peak Current Valley Threshold Voltage VCS-V 0.57 0.62 0.67 V VFB=3.9V, Duty=0% 5
Normal Oscillation Frequency FOSC 60 65 70 kHz VDD=15V, FB=3V 5
Frequency Jittering △f_OSC -9 9 % 5
Output Current of RT Pin IRT 93 100 107 μA VRT=0.9V 5
Threshold Voltage for OTP VTH_OTP 0.98 1.04 1.1 V 5
HV Pin Supply Current IHV 0.75 mA VDD=2V, HV=100V 4
HV Pin Leakage Current After Startup 10 μA VDD=15V, HV=500V 4
VFB Open Loop Voltage VFB_Open 5.4 V 4
PWM Input Gain AVCS 3 V/V 4
Burst-Mode Out FB Voltage VFB(OUT) 1.5 V VSENSE =0 4
Burst-Mode Enter FB Voltage VFB(IN) 1.35 V VSENSE =0 4
FB Pin Short Circuit Current IFB_Short 240 μA Short FB Pin to GND and Measure Current 4
Power Limiting FB Threshold Voltage VTH_PL 4.2 V 4
OTP Threshold T(THR) 150 °C 4
Soft Start Time SST 5 ms 5
Peak Current Flat Threshold Voltage VCS-F 0.92 V 5
Frequency Temperature Stability △f_Temp 10 % T=-40~85°C 5
Frequency Voltage Stability △f_VDD 10 % 5
Burst Mode Switch Frequency F_Burst 20 kHz 5
Output Low Level VOL 1 V VDD=15V, IO=20mA 5
Output High Level VOH 9 V VDD=15V, IO=20mA 5
Output Rising Time 1V~10V T_r 150 nS CL=1000pF 5
Output Falling Time 10V~1V T_f 60 nS CL=1000pF 5

CAD (KiCad official)

  • Symbol: UC3869AG-S08-R
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: uc3869ag-s08-r-etched.step / uc3869ag-s08-r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3869ag-s08-r.step / uc3869ag-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 d0649d6bbddd8561, retrieved 2026-10-18, 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