# SM6T22AY

**STMicroelectronics** · TVS · SMB(DO-214AA)

SM6T22AY from STMicroelectronics, in a SMB(DO-214AA). 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 TVS (SM6T22AY); for bidirectional types the two terminals are interchangeable, with 22 V stand-off and 30.6 V max clamping at 20 A (10/1000 µs). |
| 2 | A | passive | Anode of the unidirectional TVS (SM6T22AY), with 600 W peak pulse power (10/1000 µs) and 20.9-23.1 V breakdown at 1 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SMB(DO-214AA) |
| Category | Circuit 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 |
|---|---|---|---|---|---|---|---|
| Reverse leakage current at VRM | IRM |  |  | 0.2 | µA | at VRM, 25 °C | 3 |
| Reverse leakage current at VRM | IRM |  |  | 1 | µA | at VRM, 85 °C | 3 |
| Breakdown voltage | VBR | 20.9 | 22 | 23.1 | V | at IBR = 1 mA | 3 |
| Clamping voltage 10/1000 µs | VCL |  |  | 30.6 | V | 10/1000 µs, IPP = 20 A | 3 |
| Peak pulse current 10/1000 µs | IPP |  |  | 20 | A | 10/1000 µs | 3 |
| Dynamic resistance 10/1000 µs | RD |  |  | 0.375 | Ω | 10/1000 µs | 3 |
| Clamping voltage 8/20 µs | VCL |  |  | 39.3 | V | 8/20 µs, IPP = 102 A | 3 |
| Peak pulse current 8/20 µs | IPP |  |  | 102 | A | 8/20 µs | 3 |
| Dynamic resistance 8/20 µs | RD |  |  | 0.159 | Ω | 8/20 µs | 3 |
| Voltage temperature coefficient | αT |  |  | 9.2 | 10-4/°C |  | 3 |
| Peak pulse power dissipation | PPP |  |  | 600 | W | 10/1000 µs, Tj initial = Tamb | 2 |
| Peak pulse voltage ISO10605 contact discharge | VPP |  |  | 30 | kV | C = 330 pF, R = 330 Ω | 2 |
| Peak pulse voltage ISO10605 air discharge | VPP |  |  | 30 | kV | C = 330 pF, R = 330 Ω | 2 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 2 |
| Operating junction temperature range | Tj | -55 |  | 150 | °C |  | 2 |
| Maximum lead temperature for soldering | TL |  |  | 260 | °C | during 10 s | 2 |
| Stand-off voltage | VRM |  | 18.8 |  | V | Table 2 first voltage column, Tamb = 25 °C | 3 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | • Lead finishing: matte tin plating Complies with the following standards | 1 |

## CAD (KiCad official)

- Symbol: `SM6T22AY`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
- 3D model files: `sm6t22ay-etched.step` / `sm6t22ay-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sm6t22ay.step` / `sm6t22ay.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/sm6t22ay.pdf) (15 pp, sha256 `a139eecdd64ba8b1`, retrieved 2026-11-02, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), 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/sm6t22ay-datasheet.pdf)