# BST363A054U

**UMW** · ESD And Surge Protection (TVS/ESD) · SOT-363

BST363A054U from UMW, in a SOT-363. 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 | I/O | bidirectional | Protected data/power line that carries the ESD and surge protection, rated to IEC 61000-4-2 ±15kV contact and ±20kV air. |
| 2 | GND | power_in | Ground reference for the protection clamps; the datasheet gives the I/O-to-GND capacitance measured at VR=0V, f=1MHz. |
| 3 | I/O | bidirectional | Protected data/power line that carries the ESD and surge protection, rated to IEC 61000-4-2 ±15kV contact and ±20kV air. |
| 4 | I/O | bidirectional | Protected data/power line that carries the ESD and surge protection, rated to IEC 61000-4-2 ±15kV contact and ±20kV air. |
| 5 | VCC | power_in | Supply pin of the device; the datasheet specifies a working peak reverse voltage VRWM of 5V for the protected line. |
| 6 | I/O | bidirectional | Protected data/power line that carries the ESD and surge protection, rated to IEC 61000-4-2 ±15kV contact and ±20kV air. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| Package | SOT-363 |
| Category | Circuit Protection |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `BST363A054U`
- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`
- 3D model: SOT-363 (KiCad packages3D, STEP)
- 3D model files: `bst363a054u-etched.step` / `bst363a054u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bst363a054u.step` / `bst363a054u.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UMW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8755876619720368128) (7 pp, sha256 `1626324228960cf7`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/bst363a054u-datasheet.pdf)