# SMA6J28A-TR

**STMicroelectronics** · TVS · SMA(DO-214AC)

SMA6J28A-TR from STMicroelectronics, in a SMA(DO-214AC). 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 diode, marked by the cathode band on the package; for the bidirectional CA types the terminals are interchangeable. |
| 2 | A | passive | Anode of the unidirectional TVS diode (SMA6J28A is a 28 V stand-off type with 31.1 V to 34.4 V breakdown at 1 mA); for the bidirectional CA types the terminals are interchangeable. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SMA(DO-214AC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak pulse power dissipation | PPP |  |  | 600 | W | Tj initial = Tamb | 2 |
| Power dissipation on infinite heatsink | P |  |  | 4 | W | Tamb = 55 °C | 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) |  |  | 30 | °C/W |  | 2 |
| Thermal resistance junction to ambient | Rth(j-a) |  |  | 120 | °C/W | on printed circuit on recommended pad layout | 2 |
| Reverse leakage current | IRM |  |  | 0.2 | µA | at VRM, 25 °C | 3 |
| Reverse leakage current | IRM |  |  | 1 | µA | at VRM, 85 °C | 3 |
| Stand-off voltage | VRM |  | 28 |  | V |  | 3 |
| Breakdown voltage | VBR | 31.1 | 32.7 | 34.4 | V | at IR = 1 mA | 3 |
| Clamping voltage 10/1000 µs | VCL |  |  | 44 | V | 10/1000 µs, IPP = 13.8 A | 3 |
| Peak pulse current 10/1000 µs | IPP |  |  | 13.8 | A | 10/1000 µs | 3 |
| Dynamic resistance 10/1000 µs | RD |  |  | 0.697 | Ω | 10/1000 µs | 3 |
| Clamping voltage 8/20 µs | VCL |  |  | 59 | V | 8/20 µs, IPP = 68 A | 3 |
| Peak pulse current 8/20 µs | IPP |  |  | 68 | A | 8/20 µs | 3 |
| Dynamic resistance 8/20 µs | RD |  |  | 0.363 | Ω | 8/20 µs | 3 |
| Voltage temperature coefficient | αT |  |  | 9.8 | 10-4/°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 | copper |  | copper surface under each lead (printed circuit board | 6 |

## CAD (KiCad official)

- Symbol: `SMA6J28A-TR`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `sma6j28a-tr-etched.step` / `sma6j28a-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sma6j28a-tr.step` / `sma6j28a-tr.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/sma6j28a-tr.pdf) (13 pp, sha256 `6de68bfe2405caa1`, retrieved 2026-10-31, 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/sma6j28a-tr-datasheet.pdf)