# TPB1A40-523

**TECH PUBLIC** · MOSFETs · SOD-523

TPB1A40-523 from TECH PUBLIC, in a SOD-523. 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 | K | passive | Cathode, the end marked with the band in the package drawing; reverse voltage rated 40 V DC (VR) and mean rectifying current 1 A. |
| 2 | A | passive | Anode of the Schottky barrier diode; forward voltage 0.51 V typ and 0.61 V max at IF = 1 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECH PUBLIC |
| Package | SOD-523 |
| Category | Transistors/Thyristors |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `TPB1A40-523`
- Footprint: `Diode_SMD:D_SOD-523`
- 3D model: SOD-523 (KiCad packages3D, STEP)
- 3D model files: `tpb1a40-523-etched.step` / `tpb1a40-523-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tpb1a40-523.step` / `tpb1a40-523.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [TECH PUBLIC datasheet](docs/tpb1a40-523-datasheet.pdf) (3 pp, sha256 `ed02cba94f043080`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-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).

[Datasheet PDF](docs/tpb1a40-523-datasheet.pdf)