# P4SMA12A

**Yangzhou Yangjie Elec Tech** · TVS · DO-214AC(SMA)

P4SMA12A from Yangzhou Yangjie Elec Tech, in a DO-214AC(SMA). 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; on the unidirectional P4SMA12A the band marks this end, with VBR 11.40-12.60 V at 1 mA, VRWM 10.2 V and clamping voltage 16.7 V at IPP 23.95 A. |
| 2 | A | passive | Anode; the unmarked terminal of the unidirectional P4SMA12A (the bidirectional P4SMA12CA has no polarity marking), mounted on 5.0 x 5.0 mm copper pads per the ratings. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | DO-214AC(SMA) |
| 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 |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage | VBR | 11.4 |  | 12.6 | V | @ IT = 1 mA | 2 |
| Test current | IT |  | 1 |  | mA | Pulse test: tp≤50ms | 2 |
| Maximum Reverse Leakage | IR |  |  | 5 | μA | @ VRWM | 2 |
| Working Peak Reverse Voltage | VRWM |  |  | 10.2 | V |  | 2 |
| Maximum Reverse Surge Current | IPP |  |  | 23.95 | A | 10/1000us waveform | 2 |
| Maximum Clamping Voltage | Vc |  |  | 16.7 | V | @ IPP | 2 |
| Maximum instantaneous forward voltage | VF |  |  | 3.5 | V | at 25A, unidirectional only; 3.5 for VBR<200V | 1 |
| Maximum instantaneous forward voltage | VF |  |  | 1.5 | V | at 1A, unidirectional only | 1 |
| Peak power dissipation | PPPM |  |  | 400 | W | 10/1000us waveform | 1 |
| Power dissipation | PD |  |  | 1 | W | on infinite heat sink at TL=75℃ | 1 |
| Peak forward surge current | IFSM |  |  | 40 | A | 8.3 ms single half sine-wave, unidirectional only | 1 |
| Operating junction and storage temperature range | TJ,TSTG | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance junction to lead | RθJL |  | 30 |  | ℃/W | Typical | 2 |
| Thermal resistance junction to ambient | RθJA |  | 120 |  | ℃/W | Typical | 2 |

## 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 | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |

## CAD (KiCad official)

- Symbol: `P4SMA12A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files: `p4sma12a-etched.step` / `p4sma12a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `p4sma12a.step` / `p4sma12a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](docs/p4sma12a-datasheet.pdf) (6 pp, sha256 `257386f7d53ca6f9`, retrieved 2026-10-22, tier: lcsc)
- **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/p4sma12a-datasheet.pdf)