# SMCJ28CAQ

**Yangzhou Yangjie Elec Tech** · Electrostatic And Surge Protection (TVS/ESD) · DO-214AB(SMC)

SMCJ28CAQ from Yangzhou Yangjie Elec Tech, in a DO-214AB(SMC). 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 | A1 | passive | Bi-directional terminal 1 of the SMCJ28CAQ TVS (VRWM 28 V, VBR 31.1-34.4 V at 1 mA, Vc 45.4 V at 33.0 A); no polarity, no marking band on bi-directional types. |
| 2 | A2 | passive | Bi-directional terminal 2 of the SMCJ28CAQ TVS (VRWM 28 V, VBR 31.1-34.4 V at 1 mA, Vc 45.4 V at 33.0 A); interchangeable with terminal 1 since the bi-directional part has no cathode band. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | DO-214AB(SMC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage | VBR | 31.1 |  | 34.4 | V | @ IT = 1 mA | 2 |
| Test Current | IT |  | 1 |  | mA | Pulse test tp≤50ms | 2 |
| Maximum Reverse Leakage | IR |  |  | 1 | μA | @ VRWM | 2 |
| Working Peak Reverse Voltage | VRWM |  | 28 |  | V |  | 2 |
| Maximum Reverse Surge Current | IPP |  |  | 33 | A | 10/1000us waveform | 2 |
| Maximum Clamping Voltage | Vc |  |  | 45.4 | V | @ IPP | 2 |
| Peak power dissipation | PPPM |  |  | 1500 | W | 10/1000us waveform, Ta=25℃ | 1 |
| Power dissipation on infinite heat sink | PD |  |  | 6.5 | W | TL=75℃ | 1 |
| Operating junction temperature | TJ | -55 |  | 175 | ℃ |  | 1 |
| Storage temperature range | TSTG | -55 |  | 175 | ℃ |  | 1 |
| Thermal Resistance junction to ambient | RθJ-A |  | 75 |  | ℃/W | junction to ambient, minimum recommended pad layout | 3 |
| Thermal Resistance junction to lead | RθJ-L |  | 15 |  | ℃/W | junction to lead | 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 |
|---|---|---|---|---|
| housing |  | black | 4. Body color: Black | 4 |
| contacts |  | tin | ● Terminals: Matte tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |

## CAD (KiCad official)

- Symbol: `SMCJ28CAQ`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: DO-214AB(SMC) (KiCad packages3D, STEP)
- 3D model files: `smcj28caq-etched.step` / `smcj28caq-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smcj28caq.step` / `smcj28caq.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](docs/smcj28caq-datasheet.pdf) (7 pp, sha256 `bc358d52c706a87f`, 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/smcj28caq-datasheet.pdf)