UC2843AD8TR
Public Made by Adomby adom
Texas Instruments DC-DC Converters, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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README
markdownUC2843AD8TR
Texas Instruments · DC-DC Converters · SOIC-8
UC2843AD8TR from Texas Instruments, 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 | COMP | output | Output of the low-impedance 1-MHz internal error amplifier and input to the peak current limit / PWM comparator. Open-loop gain (AVOL) 80 dB; capable of sinking up to 6 mA and is not internally current limited. |
| 2 | FB | input | Inverting input to the error amplifier, used to control the power converter voltage-feedback loop for stability. |
| 3 | ISENSE | input | Input to the peak current limit / PWM comparator. Used with a current sense resistor; the error-amplifier output voltage controls cycle-by-cycle peak current limit. Maximum peak current sense signal is internally clamped to 1 V. |
| 4 | RT/CT | input | Input to the internal oscillator, programmed with an external timing resistor (RT) and timing capacitor (CT). TI recommends CT of 470 pF to 4.7 nF and RT of 5 kΩ to 100 kΩ. |
| 5 | GND | power_in | Controller signal ground. In the 8-pin package, both signal ground and gate-driver return share this pin. |
| 6 | OUTPUT | output | Totem-pole gate-driver output. Can sink and source up to 1 A; a gate-drive resistor must be used to limit gate-driver current. |
| 7 | VCC | power_in | Bias input to the gate driver and the IC. Requires a bypass capacitor at least 10× the gate capacitance of the main switching FET. UC2843A UVLO on/off = 8.4 V / 7.6 V; absolute max 30 V. |
| 8 | VREF | power_out | 5-V reference voltage output of the PWM controller. Must supply no more than 10 mA under normal operation; short-circuit protected at ~100 mA. Requires a 1 µF high-frequency bypass capacitor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | PMIC |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
UC2843AD8TRDUC2843AD8TRUC2843AD8TRDRUC2843AD8TRPUC2843AD8TRNUC2843AD8TRJGUC2843AD8TRDWUC2843AD8TRDWRUC2843AD8TRFKUC2843AD8TRFN
CAD (KiCad official)
- Symbol:
UC2843AD8TR - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
uc2843ad8tr-etched.step/uc2843ad8tr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc2843ad8tr.step/uc2843ad8tr.glbare the bare package body.
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
uc2843ad8tr.step |
122 KB | You want the bare part, or you mark your own boards. |
uc2843ad8tr-etched.step |
2.6 MB | You want the part with UC2843AD8TR already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 620 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (48 pp, sha256
2105c9079933cb44, 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).