component
UC3843BNG
Public Made by Adomby adom
onsemi AC-DC Controllers and Regulators, PDIP-8. Pinout extracted from 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
markdownUC3843BNG
onsemi · AC-DC Controllers and Regulators · PDIP-8
UC3843BNG from onsemi, in a PDIP-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. Available for loop compensation; an external RC network from this pin to Voltage Feedback (pin 2) sets the closed-loop frequency response of the error amplifier. |
| 2 | Voltage Feedback | input | Inverting input of the error amplifier. Normally connected to the switching power supply output through a resistor divider; the amplifier's non-inverting input is internally biased to 2.5 V. |
| 3 | Current Sense | input | Non-inverting input of the current sense comparator. Monitors switch current via a ground-referenced sense resistor; the internal PWM latch resets when this input reaches ~1.0 V, providing cycle-by-cycle current limiting. |
| 4 | RT/CT | passive | Oscillator timing pin. A resistor from Vref to this pin (RT) and a capacitor from this pin to GND (CT) program the oscillator frequency and maximum output duty cycle. Guaranteed operation to 500 kHz. |
| 5 | GND | power_in | Signal and power ground return for the IC. In the PDIP-8 / SOIC-8 package, control and power ground share this single pin (the SOIC-14 splits these into separate GND and Power Ground pins). |
| 6 | Output | output | High-current totem-pole PWM output, directly drives the gate of a power MOSFET. Sources/sinks up to 1.0 A peak (200 mA typical); output is low when UVLO is active. Rise/fall times ~50 ns into 1.0 nF. |
| 7 | VCC | power_in | Positive supply for control logic and the totem-pole output stage. For the UC3843B, UVLO turn-on is 8.4 V typical and turn-off is 7.6 V typical; startup current is 0.3 mA typical, with an internal zener clamp at ~36 V. |
| 8 | Vref | power_out | Trimmed 5.0 V reference output (±1% for UC3843B; ±2% for UC2843B/NCV3843BV). Delivers up to 20 mA to external loads and is used to bias the RT/CT timing resistor. Short-circuit protected (~-85 mA typical). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | PDIP-8 |
| Category | PMIC |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
UC3843BNGNUC3843BNGUC3843BNGD1UC3843BNGD1GUC3843BNGD1R2UC3843BNGD1R2GUC3843BNGDUC3843BNGDGUC3843BNGDR2UC3843BNGDR2G
CAD (KiCad official)
- Symbol:
UC3843BNG - Footprint:
Package_DIP:DIP-8_W7.62mm - 3D model: PDIP-8 (KiCad packages3D, STEP)
- 3D model files:
uc3843bng-etched.step/uc3843bng-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc3843bng.step/uc3843bng.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (21 pp, sha256
0a568e6a851b8837, 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).