# 1N5908

**STMicroelectronics** · TVS · DO-201

1N5908 from STMicroelectronics, in a DO-201. 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 of the unidirectional Transil, marked by the cathode band on the DO-201 package; stand-off voltage 5 V, breakdown 6 V min at 1 mA. |
| 2 | A | passive | Anode of the unidirectional Transil (1500 W, 10/1000 µs peak pulse power) on the DO-201 axial package. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | DO-201 |
| Category | TVS/Fuse/Board Level Protection |
| Pins | 2 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Leakage current at VRM | IRM |  |  | 300 | µA | @ VRM = 5 V, Tamb = 25 °C | 3 |
| Stand-off voltage | VRM |  | 5 |  | V | Tamb = 25 °C | 3 |
| Breakdown voltage | VBR | 6 |  |  | V | @ IR = 1 mA, pulse test tp < 50 ms | 3 |
| Clamping voltage 1 | VCL |  |  | 7.6 | V | @ IPP = 30 A, 10/1000 µs | 3 |
| Clamping voltage 2 | VCL |  |  | 8 | V | @ IPP = 60 A, 10/1000 µs | 3 |
| Clamping voltage 3 | VCL |  |  | 8.5 | V | @ IPP = 120 A, 10/1000 µs | 3 |
| Peak pulse power dissipation | PPP |  |  | 1500 | W | Tj initial = Tamb, Tamb = 25 °C, 10/1000 µs | 2 |
| Storage temperature range | Tstg | -65 |  | 175 | °C |  | 2 |
| Operating junction temperature range | Tj | -55 |  | 175 | °C |  | 2 |
| Maximum lead temperature for soldering | TL |  |  | 260 | °C | during 10 s | 2 |
| Thermal resistance junction to leads | Rth(j-l) |  |  | 20 | °C/W | DO-201 | 2 |
| Thermal resistance junction to ambient | Rth(j-a) |  |  | 75 | °C/W | DO-201 | 2 |
| Voltage temperature coefficient | αT |  |  | 5.7 | 10-4/°C | Tamb = 25 °C | 3 |
| Junction capacitance | C |  | 9500 |  | pF | Tamb = 25 °C | 3 |

## CAD (KiCad official)

- Symbol: `1N5908`
- Footprint: `Diode_THT:D_DO-201AD_P15.24mm_Horizontal`
- 3D model: DO-201 (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/1n5908.pdf) (9 pp, sha256 `cd9d5412f7db212a`, retrieved 2026-10-22, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-sonnet-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/1n5908-datasheet.pdf)