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UC3843B-HXY

Public Made by Adom

by adom

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

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UC3843B-HXY

HXY MOSFET · AC-DC Controllers And Regulators · SOP-8

UC3843B-HXY from HXY MOSFET, 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 COMP output Error amplifier output, usable for loop compensation, with the datasheet giving an error amplifier output sink current absolute maximum of 10 mA.
2 VFB input Inverting input of the error amplifier, normally fed through a resistor divider from the switching supply output; the internal reference on the non-inverting side is 2.50 V (2.42 V to 2.58 V).
3 Sen input Current sense input whose voltage sets whether the output is switched off, with a maximum input signal of 1.0 V typical (0.9 V to 1.1 V) and a current sense/voltage feedback input absolute range of -0.3 V to 5.5 V.
4 OSC passive Oscillator pin where RT connects to VREF and CT connects to GND, setting the switching frequency and maximum duty cycle, with frequency up to 500 kHz.
5 GND power_in Ground reference for the controller.
6 OUTPUT output Drives the power MOSFET gate directly, sourcing or sinking peak currents of up to 1 A.
7 Vcc power_in Positive supply input for the control IC, with an absolute maximum supply voltage of 30 V.
8 VREF power_out Reference voltage output of 5.00 V typical (4.90 V to 5.10 V at Io = 1 mA), which also supplies the charging current through RT to CT.

Key specifications

Parameter Value
Manufacturer HXY MOSFET
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
Supply voltage Vcc 30 V 2
Output current Io -1 1 A 2
Output energy W 5 J 2
Error amplifier output sink current Io 10 mA 2
Current sense and voltage feedback input voltage Vin -0.3 5.5 V 2
Operating junction temperature Tj 150 ℃ 2
Power dissipation PD 1 W 2
Storage temperature Tstg -55 150 ℃ 2
Operating ambient temperature Tamb 0 70 ℃ 2
Reference output voltage Vref 4.9 5 5.1 V Tj=25℃ Io=1mA 2
Line regulation ⊿Vref 6 20 mV 12V≤Vi≤25V 2
Load regulation ⊿Vref 6 25 mV 1mA≤Vi≤20mA 2
Short-circuit output current Isc -30 -100 -180 mA Ta=25℃ 2
Oscillator frequency fosc 47 52 57 kHz Tj=25℃ 2
Oscillator voltage stability ⊿fosc/V 0.2 1 % Vcc=12V to 25V 2
Discharge current Idischg 7.8 8.3 8.8 mA Tj=25℃ 3
Error amplifier reference voltage (feedback input) Vfb 2.42 2.5 2.58 V Vpin1=2.5V 3
Error amplifier input bias current Ibias -0.1 -2 μA Vfb=5V 3
Error amplifier open-loop voltage gain Gvo1 65 90 dB 2V≤Vo≤4V 3
Unity-gain bandwidth BW 0.7 1 MHz Tj=25℃ 3
Error amplifier power supply rejection ratio PSRR 60 70 dB 12V≤Vi≤25V 3
Error amplifier output sink current Isink 2 12 mA Vpin2=2.7V,Vpin1=1.1V 3
Error amplifier output source current Isource -0.5 -1 mA Vpin2=2.3V,Vpin1=5V 3
Error amplifier output high level VOH 5 6.2 V Vpin2=2.3V; Rl=15kΩ to Ground 3
Error amplifier output low level VOL 0.8 1.1 V Vpin2=2.7V; Rl=15kΩ to Pin8 3
Current sense gain Gv 2.85 3 3.15 V/V 3
Maximum input signal V3 0.9 1 1.1 V Vpin1=5V(注 1) 3
Current sense input bias current Ib -2 -10 μA 3
Propagation delay, current sense input to output TPLH(in/off) 150 300 ns 3
Output low voltage VOL 0.1 0.4 V Isink=20mA 3
Output low voltage VOL 1.6 2.2 V Isink=200mA 3
Output high voltage VOH 13 13.5 V Isource=20 mA 3
Output high voltage VOH 12 13.5 V Isource=200 mA 3
Undervoltage lockout output voltage Vols 0.7 1.2 V Vcc=6V;Isink=1mA 3
Output voltage rise time tr 50 150 ns Tj=25℃ Cl=1nF(注 3) 3
Output voltage fall time tf 50 150 ns Tj=25℃ Cl=1nF(注 3) 3
Start-up (UVLO turn-on) threshold voltage Vth 7.8 8.4 9 V 3
Minimum operating voltage after turn-on (UVLO turn-off) Vcc(min) 7 7.6 8.2 V 3
Maximum duty cycle D (max) 94 96 100 % 3
Start-up current Ist 0.12 0.3 mA Vi=14V 3
Operating supply current Ii 12 17 mA Vpin2=Vpin3=0V 3
Zener voltage Viz 30 36 V Ii=25mA 3
Output noise voltage en 50 μV 10Hz≤f≤10kHz 2
Oscillator temperature stability fosc/T 5 % Ta=Tlow to Thigh 3
Oscillator peak-to-peak amplitude Vosc 1.6 V peak to peak 3
Current sense supply voltage rejection ratio SVR 70 dB 12V≤Vi≤25V(注 1) 3
Minimum duty cycle D (min) 0 % 3

CAD (KiCad official)

  • Symbol: UC3843B-HXY
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: uc3843b-hxy-etched.step / uc3843b-hxy-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3843b-hxy.step / uc3843b-hxy.glb are the bare package body.

Provenance

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

  • Datasheet: HXY MOSFET datasheet (9 pp, sha256 ca0661eca62c4222, retrieved 2026-10-19, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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