# TPTLV431BQDBZR

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

TPTLV431BQDBZR 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 | REF | input | Reference input pin. Compared internally to the ~1.24V bandgap reference; used with an external resistor divider between CATHODE and ANODE to set the cathode voltage (Vka = Vref*(1+R1/R2) + Iref*R1). Reference input current typ 0.7µA, max 4µA. |
| 2 | CATHODE | passive | Cathode (K) of the shunt regulator. Sinks the regulation current; Vka rated to 18V max, continuous cathode current range 0.1mA to 100mA (abs max -100 to +150mA). Dynamic impedance 0.05Ω typ. |
| 3 | ANODE | passive | Anode (A) of the shunt regulator. All voltages in the datasheet are referenced to this pin; typically tied to the low-side of the feedback divider / ground return. |

## Key specifications

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

## Ordering variants

Same part, different packaging or reel option.

- `TPTLV431BQDBZR`

## CAD (KiCad official)

- Symbol: `TPTLV431BQDBZR`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `tptlv431bqdbzr-etched.step` / `tptlv431bqdbzr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tptlv431bqdbzr.step` / `tptlv431bqdbzr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](docs/tptlv431bqdbzr-datasheet.pdf) (5 pp, sha256 `84693c4980b7f19d`, 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/tptlv431bqdbzr-datasheet.pdf)