# H12VSD3B

**hongjiacheng** · ESD And Surge Protection (TVS/ESD) · SOD-323

H12VSD3B from hongjiacheng, in a SOD-323. 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 | 1 | passive | Bi-directional TVS terminal 1, interchangeable with pin 2, for protection with 12V max reverse working voltage, 1.5pF max junction capacitance and ±30kV IEC 61000-4-2 ESD rating. |
| 2 | 2 | passive | Bi-directional TVS terminal 2, interchangeable with pin 1, for protection with 12V max reverse working voltage, 20A 8/20µs peak pulse current and 32V max clamping at 20A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| Package | SOD-323 |
| 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 Reverse Working Voltage | VRWM |  |  | 12 | V | Ta=25℃ | 2 |
| Breakdown Voltage | VBR | 13.3 |  | 16.5 | V | IR=1mA,Ta=25℃ | 2 |
| Reverse Leakage Current | IR |  |  | 1 | μA | VR=12V,Ta=25℃ | 2 |
| Clamping Voltage | VC |  |  | 20 | V | IPP=5A, tp=8/20μs | 2 |
| Clamping Voltage | VC |  |  | 28 | V | IPP=15A,tp=8/20μs | 2 |
| Clamping Voltage | VC |  |  | 32 | V | IPP=20A,tp=8/20μs | 2 |
| Junction Capacitance | CJ |  |  | 1.5 | pF | VR=0V,f=1MHz | 2 |
| ESD Electrostatic Discharge Voltage (IEC 61000-4-2 Air) | VESD | -30 |  | 30 | KV | ESD per IEC 61000-4-2 (Air) | 1 |
| ESD Electrostatic Discharge Voltage (IEC 61000-4-2 Contact) | VESD | -30 |  | 30 | KV | ESD per IEC 61000-4-2 (Contact) | 1 |
| Peak Pulse Power | PPP |  |  | 640 | W | tp = 8/20 µs | 1 |
| Rated Peak Pulse Current | IPP |  |  | 20 | A | tp = 8/20 µs | 1 |
| Operating Junction Temperature Range | TJ | -55 |  | 125 | ℃ |  | 1 |
| Operating JunctionTemperature Range (storage, as labelled) | TSTG | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `H12VSD3B`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `h12vsd3b-etched.step` / `h12vsd3b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `h12vsd3b.step` / `h12vsd3b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [hongjiacheng datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8756315152532541440) (3 pp, sha256 `1609741588deee25`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/h12vsd3b-datasheet.pdf)