# SMBJ43A

**GOODWORK** · TVS · DO-214AA(SMB)

SMBJ43A from GOODWORK, in a DO-214AA(SMB). 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 color band on the unidirectional SMBJ43A; reverse stand-off voltage VRWM 43 V, breakdown 47.8 V min to 54.9 V max at 1 mA, clamping 69.4 V at 8.6 A peak pulse current. |
| 2 | A | passive | Anode, the end opposite the color band of the unidirectional SMBJ43A; reverse leakage 5 uA max at VRWM 43 V, 600 W peak pulse power (10/1000 us). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | GOODWORK |
| Package | DO-214AA(SMB) |
| 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 Stand-off Voltage | VRWM |  | 43 |  | V |  | 3 |
| Breakdown Voltage (min) | VBR | 47.8 |  | 54.9 | V | @IT = 1 mA | 3 |
| Test Current | IT |  | 1 |  | mA |  | 3 |
| Maximum Clamping Voltage | Vc |  |  | 69.4 | V | @Ipp = 8.6 A | 3 |
| Peak Pulse Current | Ipp |  |  | 8.6 | A |  | 3 |
| Reverse Leakage Current | IR |  |  | 5 | uA | @VRWM | 3 |
| Peak Power Dissipation | PPK | 600 |  |  | Watts | TA=25 C, TP=1ms (Note 1) | 1 |
| Peak Forward Surge Current | IFSM |  |  | 100 | Amps | 8.3ms single half sine-wave superimposed on rated load (JEDEC method) | 1 |
| Operating and Storage Temperature Range | TJ, TSTG | -55 |  | 150 | C |  | 1 |
| Thermal Resistance Junction to Case | RθJ-C |  | 20 |  | C/W | Between junction and case, typical | 1 |
| Thermal Resistance Junction to Air | RθJ-A |  | 95 |  | C/W | Between junction and air, typical | 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 Copper Pad area of 5.0mm (.013mm Thick) to each terminal. | 1 |

## CAD (KiCad official)

- Symbol: `SMBJ43A`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: DO-214AA(SMB) (KiCad packages3D, STEP)
- 3D model files: `smbj43a-etched.step` / `smbj43a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smbj43a.step` / `smbj43a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [GOODWORK datasheet](docs/smbj43a-datasheet.pdf) (7 pp, sha256 `30a80bd88d27f7ca`, 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/smbj43a-datasheet.pdf)