component
BST143A053U
Public Made by Adomby adom
BORN ESD And Surge Protection (TVS/ESD), SOT-143. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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BST143A053U
BORN · ESD And Surge Protection (TVS/ESD) · SOT-143
BST143A053U from BORN, in a SOT-143. 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 | REF1 | power_in | Negative reference (REF1) of the steering diodes; it should be connected directly to a ground plane with the shortest possible path to minimize parasitic inductance. |
| 2 | I/O1 | passive | Protected data line 1; the steering diodes clamp transients on this line to the reference, and the device has a 5.0 V reverse stand-off voltage (VRWM). |
| 3 | I/O2 | passive | Protected data line 2; the steering diodes clamp transients on this line to the reference, and the device has a 5.0 V reverse stand-off voltage (VRWM). |
| 4 | REF2 | passive | Positive reference (REF2); it may be tied directly to VCC, tied to VCC through a 10 kΩ series resistor for supply isolation, or left unconnected so the internal TVS is used as the reference. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | BORN |
| Package | SOT-143 |
| Category | Circuit Protection |
| Pins | 4 |
CAD (KiCad official)
- Symbol:
BST143A053U - Footprint:
Package_TO_SOT_SMD:SOT-143 - 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files:
bst143a053u-etched.step/bst143a053u-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bst143a053u.step/bst143a053u.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: BORN datasheet (7 pp, sha256
01ad1a8633e1c096, retrieved 2026-10-09, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).
# BST143A053U
**BORN** · ESD And Surge Protection (TVS/ESD) · SOT-143
BST143A053U from BORN, in a SOT-143. 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 | REF1 | power_in | Negative reference (REF1) of the steering diodes; it should be connected directly to a ground plane with the shortest possible path to minimize parasitic inductance. |
| 2 | I/O1 | passive | Protected data line 1; the steering diodes clamp transients on this line to the reference, and the device has a 5.0 V reverse stand-off voltage (VRWM). |
| 3 | I/O2 | passive | Protected data line 2; the steering diodes clamp transients on this line to the reference, and the device has a 5.0 V reverse stand-off voltage (VRWM). |
| 4 | REF2 | passive | Positive reference (REF2); it may be tied directly to VCC, tied to VCC through a 10 kΩ series resistor for supply isolation, or left unconnected so the internal TVS is used as the reference. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | BORN |
| Package | SOT-143 |
| Category | Circuit Protection |
| Pins | 4 |
## CAD (KiCad official)
- Symbol: `BST143A053U`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `bst143a053u-etched.step` / `bst143a053u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bst143a053u.step` / `bst143a053u.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/8586200271357272064) (7 pp, sha256 `01ad1a8633e1c096`, 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/bst143a053u-datasheet.pdf)