# BSD3A311V

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

BSD3A311V 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 | Cathode | passive | Cathode of the unidirectional TVS diode, connected to the protected line (e.g. USB VBUS/power line) with 30 V reverse stand-off voltage and 31.5 V minimum breakdown at 1 mA. |
| 2 | A | passive | Anode of the unidirectional TVS diode, normally connected to ground, clamping surges to 48 V max at IPP = 5 A (8/20 µs). |

## 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 |
|---|---|---|---|---|---|---|---|
| Reverse Stand-Off Voltage | VRWM |  |  | 30 | V |  | 2 |
| Reverse Breakdown Voltage | VBR | 31.5 | 34 | 36 | V | IT=1mA | 2 |
| Reverse Leakage Current | IR |  |  | 0.5 | uA | VRWM=30V,T=25℃ | 2 |
| Clamping Voltage | VC |  | 44 | 48 | V | IPP=5A,tp=8/20μs | 2 |
| Junction Capacitance | Cj |  | 38 | 45 | pF | VR = 0V, f = 1MHz | 2 |
| Peak Pulse Power | PPP |  |  | 220 | Watts | tp =8/20μs | 2 |
| Peak Pulse Current | Ipp |  |  | 5 | A | tp =8/20μs | 2 |
| ESD per IEC 61000-4-2 (Air) | VESD |  |  | 25 | kV | IEC 61000-4-2 Air | 2 |
| ESD per IEC 61000-4-2 (Contact) | VESD |  |  | 25 | kV | IEC 61000-4-2 Contact | 2 |
| Lead Soldering Temperature | TL |  |  | 260 | ℃ | 10seconds | 2 |
| Junction Temperature | TJ | -55 |  | 150 | ℃ |  | 2 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 2 |

## CAD (KiCad official)

- Symbol: `BSD3A311V`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `bsd3a311v-etched.step` / `bsd3a311v-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bsd3a311v.step` / `bsd3a311v.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/8602849029839597568) (4 pp, sha256 `095f9cb8d4c1c383`, 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/bsd3a311v-datasheet.pdf)