# NUP2125WTT1G

**TECH PUBLIC** · ESD And Surge Protection (TVS/ESD) · SOT-323

NUP2125WTT1G from TECH PUBLIC, in a SOT-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 | PIN 1 | passive | Protected CAN bus line 1 (bidirectional TVS path to common pin 3), reverse working voltage 24V max, ESD ±30kV air/contact per IEC 61000-4-2. |
| 2 | PIN 2 | passive | Protected CAN bus line 2 (bidirectional TVS path to common pin 3), reverse working voltage 24V max, ESD ±30kV air/contact per IEC 61000-4-2. |
| 3 | PIN 3 | passive | Common pin joining the back-to-back diode pairs of pins 1 and 2 as shown in the schematic; the datasheet does not label it as ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECH PUBLIC |
| Package | SOT-323 |
| Category | Circuit Protection |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `NUP2125WTT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `nup2125wtt1g-etched.step` / `nup2125wtt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `nup2125wtt1g.step` / `nup2125wtt1g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589836788463673344) (4 pp, sha256 `1c5b586bfc6eb8b0`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-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/nup2125wtt1g-datasheet.pdf)