# TPMMDT5551

**TECH PUBLIC** · Bipolar (BJT) · SOT-363

TPMMDT5551 from TECH PUBLIC, in a SOT-363. 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 | E1 | passive | Emitter of the first NPN transistor (Q1), per the circuit diagram; VEBO is 6 V maximum. |
| 2 | B1 | passive | Base of the first NPN transistor (Q1), per the circuit diagram; VEBO is 6 V maximum. |
| 3 | C2 | passive | Collector of the second NPN transistor (Q2), per the circuit diagram; VCBO is 180 V, VCEO is 160 V, and IC is 0.2 A continuous. |
| 4 | E2 | passive | Emitter of the second NPN transistor (Q2), per the circuit diagram; VEBO is 6 V maximum. |
| 5 | B2 | passive | Base of the second NPN transistor (Q2), per the circuit diagram; VEBO is 6 V maximum. |
| 6 | C1 | passive | Collector of the first NPN transistor (Q1), per the circuit diagram; VCBO is 180 V, VCEO is 160 V, and IC is 0.2 A continuous. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECH PUBLIC |
| Package | SOT-363 |
| Category | Transistors/Thyristors |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `TPMMDT5551`
- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`
- 3D model: SOT-363 (KiCad packages3D, STEP)
- 3D model files: `tpmmdt5551-etched.step` / `tpmmdt5551-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tpmmdt5551.step` / `tpmmdt5551.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/8603080450889818112) (4 pp, sha256 `13fa943e01de3f94`, retrieved 2026-10-18, 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/tpmmdt5551-datasheet.pdf)