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UC3843B-HXY
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HXY MOSFET AC-DC Controllers And Regulators, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownUC3843B-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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc3843b-hxy.step/uc3843b-hxy.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-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).