# TIP31C

**STMicroelectronics** · Bipolar (BJT) · TO-220

TIP31C from STMicroelectronics, in a TO-220. 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 | Base | input | Base terminal of the NPN power transistor; base current IB is rated up to 1 A absolute maximum. |
| 2 | Collector | passive | Collector terminal, internally connected to the metal mounting tab; rated for collector-emitter voltage up to 100 V and collector current up to 3 A (5 A peak). |
| 3 | Emitter | passive | Emitter terminal of the NPN power transistor; emitter-base voltage rated up to 5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | TO-220 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Collector-base voltage | VCBO |  |  | 100 | V | IE = 0 | 3 |
| Collector-emitter voltage | VCEO |  |  | 100 | V | IB = 0 | 3 |
| Emitter-base voltage | VEBO |  |  | 5 | V | IC = 0 | 3 |
| Collector current | IC |  |  | 3 | A |  | 3 |
| Collector peak current | ICM |  |  | 5 | A |  | 3 |
| Base current | IB |  |  | 1 | A |  | 3 |
| Total dissipation | PTOT |  |  | 40 | W | Tcase = 25°C | 3 |
| Total dissipation | PTOT |  |  | 2 | W | Tamb = 25°C | 3 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 3 |
| Max. operating junction temperature | TJ |  |  | 150 | °C |  | 3 |
| Collector cut-off current | ICEO |  |  | 0.3 | mA | IB = 0, VCE = 60V | 4 |
| Emitter cut-off current | IEBO |  |  | 1 | mA | IC = 0, VEB = 5V | 4 |
| Collector cut-off current | ICES |  |  | 0.2 | mA | VBE = 0, VCE = 100V | 4 |
| Collector-emitter sustaining voltage | VCEO(sus) | 100 |  |  | V | IB = 0, IC = 30mA; pulsed duration = 300 ms, duty cycle ≥ 1.5% | 4 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 1.2 | V | IC = 3A, IB = 375mA; pulsed duration = 300 ms, duty cycle ≥ 1.5% | 4 |
| Base-emitter voltage | VBE(on) |  |  | 1.8 | V | IC = 3A, VCE = 4V | 4 |

## CAD (KiCad official)

- Symbol: `TIP31C`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files: `tip31c-etched.step` / `tip31c-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tip31c.step` / `tip31c.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/tip31c.pdf) (10 pp, sha256 `01acd35a9e756d39`, retrieved 2026-09-22, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-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/tip31c-datasheet.pdf)