# SMCJ400A

**JUXING** · ESD And Surge Protection (TVS/ESD) · SMC

SMCJ400A from JUXING, in a 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 | Cathode | passive | Cathode terminal of the unidirectional SMCJ400A transient voltage suppressor, identified as pin 1 in the PINNING table for the SMC outline. |
| 2 | Anode | passive | Anode terminal of the unidirectional SMCJ400A transient voltage suppressor, identified as pin 2 in the PINNING table for the SMC outline. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JUXING |
| Package | SMC |
| 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 | PPPM |  |  | 1500 | W | Tp=1ms, TA=25°C (Note 1) | 1 |
| Peak Forward Surge Current | IFSM |  |  | 200 | A | 8.3ms single half sine wave superimposed on rated load (JEDEC method), unidirectional only (Note 2,3) | 1 |
| Maximum Instantaneous Forward Voltage | VF |  |  | 3.5 | V | at 100A, unidirectional only (Note 4); single die parts (Note 3) | 1 |
| Reverse Stand-off Voltage | VRMW |  | 400 |  | V |  | 2 |
| Breakdown Voltage (min) | VBR | 447 |  |  | V | IT = 1 mA | 2 |
| Breakdown Voltage (max) | VBR |  |  | 494 | V | IT = 1 mA | 2 |
| Maximum Clamping Voltage | VC |  |  | 648 | V | at IPP = 2.3 A | 2 |
| Maximum Reverse Leakage | IR |  |  | 1 | µA |  | 2 |
| VBR Temperature Coefficient | αT |  | 0.1 |  | % | typical value; VBR @ TJ = VBR@25°C x (1+αT x (TJ - 25)) | 1 |
| Operating Junction and Storage Temperature Range | Tj, TSTG | -55 |  | 150 | ℃ |  | 1 |

## 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 | terminal fnish material is tin(Sn) (IPC/JEDEC J-STD-609A.01) | 1 |

## CAD (KiCad official)

- Symbol: `SMCJ400A`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: SMC (KiCad packages3D, STEP)
- 3D model files: `smcj400a-etched.step` / `smcj400a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smcj400a.step` / `smcj400a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [JUXING datasheet](docs/smcj400a-datasheet.pdf) (4 pp, sha256 `2aadbc84ce310c24`, retrieved 2026-10-22, tier: lcsc)
- **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/smcj400a-datasheet.pdf)