# TPB1A40-523-1

**TECH PUBLIC** · MOSFETs · SOD-523

TPB1A40-523-1 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 terminal marked by the dark band and the "−" sign on the outline drawing; the diode's DC reverse voltage is rated 40 V maximum and mean rectifying current is 1 A. |
| 2 | A | passive | Anode, the terminal marked "+" on the outline drawing; the diode's non-repetitive peak forward surge current is 7 A (t=8.3 ms) and the junction temperature range is -40 to +125 °C. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `TPB1A40-523-1`
- Footprint: `Diode_SMD:D_SOD-523`
- 3D model: SOD-523 (KiCad packages3D, STEP)
- 3D model files: `tpb1a40-523-1-etched.step` / `tpb1a40-523-1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tpb1a40-523-1.step` / `tpb1a40-523-1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603102146837962752) (3 pp, sha256 `41d125ab2ce39063`, retrieved 2026-10-15, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/tpb1a40-523-1-datasheet.pdf)