# SMAJ70CA-TR

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

SMAJ70CA-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 | Terminal 1 (bidirectional, no polarity) | passive | One of two identical bidirectional Transil terminals for the SMAJ70CA, which has no cathode band and clamps in both polarities at a 70 V stand-off voltage, with 77.8 V min and 81.9 V max breakdown at 1 mA. |
| 2 | Terminal 2 (bidirectional, no polarity) | passive | The second of two identical bidirectional Transil terminals for the SMAJ70CA, rated for 400 W peak pulse power (10/1000 µs) and an operating junction temperature up to 150 °C. |

## 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 |
|---|---|---|---|---|---|---|---|
| Reverse leakage current (25 °C) | IRM |  |  | 0.2 | µA | @VRM, 25 °C | 3 |
| Reverse leakage current (85 °C) | IRM |  |  | 1 | µA | @VRM, 85 °C | 3 |
| Breakdown voltage | VBR | 70 | 77.8 | 81.9 | V | @IR = 1 mA; pulse test tp < 50 ms | 3 |
| Clamping voltage (10/1000 µs) | VCL |  |  | 113 | V | @IPP = 3.5 A, 10/1000 µs | 3 |
| Dynamic resistance (10/1000 µs) | RD |  |  | 7.72 | Ω | 10/1000 µs | 3 |
| Clamping voltage (8/20 µs) | VCL |  |  | 146 | V | @IPP = 16 A, 8/20 µs | 3 |
| Dynamic resistance (8/20 µs) | RD |  |  | 3.75 | Ω | 8/20 µs | 3 |
| Voltage temperature coefficient | αT |  | 10.5 |  | 10-4/° C |  | 3 |
| Peak pulse power dissipation | PPP |  |  | 400 | W | Tj initial = Tamb | 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 |
| 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 |

## CAD (KiCad official)

- Symbol: `SMAJ70CA-TR`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `smaj70ca-tr-etched.step` / `smaj70ca-tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smaj70ca-tr.step` / `smaj70ca-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/smaj70ca-tr.pdf) (10 pp, sha256 `4bb181453198810d`, retrieved 2026-10-21, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/smaj70ca-tr-datasheet.pdf)