# BSD3C121L

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

BSD3C121L from BORN, 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 | TVS terminal 1 of the single protected line (VWM 12.0V, min VBR 13.3V @ 1mA, max VC 19.0V @ IP=1A, 350W peak pulse power 8/20μs). |
| 2 | 2 | passive | TVS terminal 2 of the single protected line (VWM 12.0V, min VBR 13.3V @ 1mA, max VC 19.0V @ IP=1A, 350W peak pulse power 8/20μs). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BORN |
| 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 Pulse Power | PPP |  |  | 350 | Watts | tp=8/20μs | 2 |
| Operating Temperature (Junction) | TJ | -55 |  | 150 | °C |  | 2 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 2 |
| Rated Stand-off Voltage | VWM |  |  | 12 | V |  | 2 |
| Minimum Breakdown Voltage | VBR | 13.3 |  |  | V | @ 1mA | 2 |
| Maximum Clamping Voltage | VC |  |  | 19 | V | @ IP = 1A | 2 |
| Maximum Clamping Voltage | VC |  |  | 28.6 | V | @ 8/20μs, IPP = 11.0A | 2 |
| Maximum Leakage Current | Id |  |  | 1 | μA | @VWM | 2 |
| Typical Capacitance | C |  | 1 |  | pF | @0V, 1 MHz | 2 |

## CAD (KiCad official)

- Symbol: `BSD3C121L`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `bsd3c121l-etched.step` / `bsd3c121l-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bsd3c121l.step` / `bsd3c121l.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BORN datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588880608223236096) (4 pp, sha256 `69bb5803b335e2b4`, 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/bsd3c121l-datasheet.pdf)