# AN431BN-ATRG1

**Diodes Incorporated** · Voltage Reference · SOT-23

AN431BN-ATRG1 from Diodes Incorporated, 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 (K) terminal of the shunt regulator. Sinks the regulated current when VREF pin reaches the internal 2.5 V reference. Operating cathode voltage 2.5 V to 36 V; cathode current 1 mA to 100 mA; absolute max VKA = 40 V. |
| 2 | REF | input | Reference input pin. Regulates the cathode so that VREF equals the internal 2.5 V bandgap. Typical reference input current 0.7 μA (max 4 μA); absolute max IREF = 10 mA. |
| 3 | ANODE | passive | Anode (A) terminal, the current return of the shunt regulator, typically tied to circuit ground in the standard divider-programmed shunt topology. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-23 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

- `AN431BN-ATRG1`

## CAD (KiCad official)

- Symbol: `AN431BN-ATRG1`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `an431bn-atrg1-etched.step` / `an431bn-atrg1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `an431bn-atrg1.step` / `an431bn-atrg1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/AN431BN-ATRG1.pdf) (13 pp, sha256 `abb5965f39adbd33`, retrieved 2026-08-17, tier: manufacturer)
- **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/an431bn-atrg1-datasheet.pdf)