# TP4040C25S3

**TECH PUBLIC** · Voltage Reference · SOT-23

TP4040C25S3 from TECH PUBLIC, in a SOT-23. 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 | CATHODE | passive | Cathode (+) of the shunt voltage reference. Regulates to VR = 2.5 V (±0.5%) above the anode when biased through an external series resistor RS. Reverse current range IRMIN = 45 µA to IR(max) = 20 mA; forward current limit 10 mA. |
| 2 | ANODE | passive | Anode (−) of the shunt voltage reference; typically tied to circuit ground/return. All voltage values in the datasheet are referenced to this pin. |
| 3 | NC | unconnected | No internal connection to the reference circuit; pin is attached to the die substrate and must be connected to ANODE or left open. |

## Key specifications

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

## Ordering variants

Same part, different packaging or reel option.

- `TP4040C25S3`

## CAD (KiCad official)

- Symbol: `TP4040C25S3`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `tp4040c25s3-etched.step` / `tp4040c25s3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tp4040c25s3.step` / `tp4040c25s3.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](docs/tp4040c25s3-datasheet.pdf) (6 pp, sha256 `f9ce38855720d349`, 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/tp4040c25s3-datasheet.pdf)