component
UC2843BD1R2G
Public Unreviewedby Ray
onsemi AC-DC Controllers and Regulators, SOIC-8. Datasheet-verified pinout, 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
markdownUC2843BD1R2G
onsemi · AC-DC Controllers and Regulators · SOIC-8
UC2843BD1R2G from onsemi, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | Compensation | output | Error Amplifier output made available for loop compensation. Typical output swing 0.8 V (low) to 6.2 V (high); source ~0.5 mA, sink ~12 mA. |
| 2 | Voltage Feedback | input | Inverting input of the Error Amplifier, normally connected to the switching supply output through a resistor divider. Reference input threshold ~2.5 V; input bias current typ -0.1 uA. |
| 3 | Current Sense | input | A voltage proportional to inductor current is applied to this pin. The PWM uses this information to terminate output switch conduction. Max input threshold ~1.0 V; comparator gain Av = 3.0 V/V. |
| 4 | RT/CT | passive | Oscillator frequency and maximum duty cycle are programmed by connecting resistor RT to Vref and capacitor CT to ground. Operation to 500 kHz is possible. Peak/valley thresholds ~2.8 V / 1.2 V; discharge current ~8.3 mA. |
| 5 | GND | power_in | Combined control circuitry and power ground return (SOIC-8 / PDIP-8 packages combine these grounds into a single pin). |
| 6 | Output | output | High-current totem-pole output that directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are sourced and sunk by this pin. Rise/fall times ~50 ns (CL = 1 nF). |
| 7 | VCC | power_in | Positive supply of the control IC. Absolute maximum 30 V; startup current 0.3 mA typ; operating current 12 mA typ. UC2843B UVLO: 8.5 V (on) / 7.6 V (off). |
| 8 | Vref | power_out | 5.0 V reference output (tolerance +/-1% at 25 C). Provides charging current for capacitor CT through timing resistor RT. Short-circuit current typ -85 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-8 |
| Category | PMIC |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
UC2843BD1R2GUC2843BD1R2GD1GUC2843BD1R2GNUC2843BD1R2GNGUC2843BD1R2GDGUC2843BD1R2GDR2G
CAD (KiCad official)
- Symbol:
UC2843BD1R2G - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (22 pp, sha256
581ae31fbd1f3e07, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).