# SMCJ220A

**MDD（Microdiode Electronics）** · TVS · DO-214AB(SMC)

SMCJ220A from MDD（Microdiode Electronics）, 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 | K | passive | Cathode, marked by the cathode band on the unidirectional SMCJ220A; connect to the positive side of the protected line (VRWM 220 V, VBR 246-272 V at 1 mA, VC max 356 V at IPP 4.2 A). |
| 2 | A | passive | Anode, the terminal opposite the cathode band on the unidirectional SMCJ220A; connect to the return/ground side (1500 W peak pulse power at 10/1000 µs). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MDD（Microdiode Electronics） |
| 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 | 246 |  | 272 | V | @IT=1mA | 3 |
| Reverse Stand-Off Voltage | VRWM |  | 220 |  | V |  | 3 |
| Maximum Clamping Voltage | VC |  |  | 356 | V | @IPP=4.2A | 3 |
| Peak Pulse Current | IPP |  |  | 4.2 | A | 10/1000μs waveform | 3 |
| Reverse Leakage Current | IR |  |  | 1 | μA | @VRWM | 3 |
| Test Current | IT |  | 1 |  | mA |  | 3 |
| Peak pulse power dissipation | PPPM | 1500 |  |  | W | 10/1000μs waveform, TA=25℃ | 1 |
| Steady state power dissipation | PM(AV) |  |  | 6.5 | W | TA=50℃ | 1 |
| Peak forward surge current | IFSM |  |  | 200 | A | 8.3ms single half sine-wave superimposed on rated load, JEDEC Method | 1 |
| Operating junction and storage temperature range | TJ,TSTG | -65 |  | 150 | ℃ |  | 1 |
| Thermal resistance junction to lead | RθJL |  | 15 |  | ℃/W | Typical | 1 |
| Thermal resistance junction to ambient | RθJA |  | 75 |  | ℃/W | Typical | 1 |
| Breakdown voltage tolerance | VBR | -5 |  | 5 | % | A suffix: 5% VBR voltage tolerance | 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 | copper |  | 2. Mounted on 5.0mm×5.0mm (0.03mm thick) copper pads to each terminal. | 1 |

## CAD (KiCad official)

- Symbol: `SMCJ220A`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: DO-214AB(SMC) (KiCad packages3D, STEP)
- 3D model files: `smcj220a-etched.step` / `smcj220a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smcj220a.step` / `smcj220a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MDD（Microdiode Electronics） datasheet](docs/smcj220a-datasheet.pdf) (5 pp, sha256 `7671c30795f6c653`, 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/smcj220a-datasheet.pdf)