component
UC2843BD1
Public Made by Adomby adom
STMicroelectronics AC-DC Controllers And Regulators, SO-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
markdownUC2843BD1
STMicroelectronics · AC-DC Controllers And Regulators · SO-8
UC2843BD1 from STMicroelectronics, in a SO-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, made available for loop compensation, with the error amplifier output sink current rated at 10 mA maximum. |
| 2 | VFB | input | Inverting input of the error amplifier, normally connected to the switching power supply output through a resistor divider; the analog inputs (pins 2 and 3) are rated -0.3 V to 5.5 V. |
| 3 | ISENSE | input | Input receiving a voltage proportional to inductor current, which the PWM uses to terminate output switch conduction; the analog input is rated -0.3 V to 5.5 V and the current-sense maximum input signal is 1 V typical. |
| 4 | RT/CT | passive | Oscillator timing pin, with resistor RT connected to Vref and capacitor CT to ground to program the oscillator frequency and maximum output duty cycle; operation to 500 kHz is possible. |
| 5 | GROUND | power_in | Combined control circuitry and power ground, to which all voltages on the device are referenced. |
| 6 | OUTPUT | output | Drives the gate of a power MOSFET directly, sourcing and sinking peak currents of up to 1 A. |
| 7 | VCC | power_in | Positive supply of the control IC, rated at 30 V maximum from a low-impedance source; the supply is self-limiting when Ii is below 30 mA. |
| 8 | Vref | power_out | Reference output providing a trimmed 5.00 V (4.90 to 5.10 V over temperature for UC384XB; 4.95 to 5.05 V at 25 °C for UC284XB) with up to 50 mA, also supplying charging current for CT through RT. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SO-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
UC2843BD1 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files:
uc2843bd1-etched.step/uc2843bd1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc2843bd1.step/uc2843bd1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (15 pp, sha256
fedfd7362400f8b3, retrieved 2026-10-07, tier: lcsc) - 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).