# TPNUP2105LT1G

**TECH PUBLIC** · ESD Protection Devices · SOT-23

TPNUP2105LT1G from TECH PUBLIC, in a SOT-23. 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 1 | passive | Protected line 1 of the bi-directional TVS pair, connected through the back-to-back diodes to pin 3, with 25pF typical junction capacitance between pin 1 and pin 2. |
| 2 | I/O 2 | passive | Protected line 2 of the bi-directional TVS pair, connected through the back-to-back diodes to pin 3, with reverse working voltage of 24V max. |
| 3 | Common | passive | Common node joining both TVS diode branches (pin 1 and pin 2 each connect to it), with ESD rating of ±30kV air and contact per IEC 61000-4-2. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECH PUBLIC |
| Package | SOT-23 |
| Category | Circuit Protection |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `TPNUP2105LT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `tpnup2105lt1g-etched.step` / `tpnup2105lt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tpnup2105lt1g.step` / `tpnup2105lt1g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](docs/tpnup2105lt1g-datasheet.pdf) (4 pp, sha256 `c5a2a4805d76fa15`, retrieved 2026-11-04, 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/tpnup2105lt1g-datasheet.pdf)