# BTC900N

**BORN** · Gas Discharge Tube Arresters (GDT) · 1812

BTC900N from BORN, in a 1812. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | A1 | passive | Gas discharge tube electrode 1. Symmetric bidirectional overvoltage-protection terminal; connects between the protected line (e.g. Tip/Ring) and ground or the opposite electrode. Fires at DC spark-over ~90 V (±30%) and clamps at ~15 V arc voltage while diverting surge current (up to 2.0 kA, 8/20 μs). |
| 2 | A2 | passive | Gas discharge tube electrode 2. Symmetric counterpart to electrode 1; the two electrodes are electrically equivalent and the tube is non-polarized. Under normal operation the electrodes are open (>=1 GΩ insulation @50 V DC); above the spark-over voltage the tube ionizes and shunts surge current between the two terminals. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BORN |
| Package | 1812 |
| Category | Circuit Protection |
| Pins | 2 |

## Ordering variants

Same part, different packaging or reel option.

- `BTC900N`

## CAD (KiCad official)

- Symbol: `BTC900N`
- Footprint: `Resistor_SMD:R_1812_4532Metric`
- 3D model: 1812 (KiCad packages3D, STEP)
- 3D model files: `btc900n-etched.step` / `btc900n-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `btc900n.step` / `btc900n.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/8588905305464193024) (3 pp, sha256 `703f08479fe7208f`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/btc900n-datasheet.pdf)