# AS431ANTR-G1

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

AS431ANTR-G1 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 | REF | input | Reference / feedback input. Internal op-amp compares this pin against the 2.500V bandgap reference and drives the internal shunt transistor. Typical reference input current IREF = 0.7µA (max 4µA). Absolute maximum input current 10mA. |
| 2 | CATHODE | passive | Cathode (K) of the shunt regulator. Sinks the regulation current when VREF pin reaches 2.500V. Operating cathode voltage range VREF to 36V, cathode current IKA 1mA to 100mA; absolute max VKA = 40V and IKA = 150mA. Off-state leakage 0.05µA typ at VKA = 36V. |
| 3 | ANODE | passive | Anode (A) of the shunt regulator. Common return terminal for the internal reference, op-amp and shunt transistor; typically connected to circuit ground in shunt-regulator use. |

## Key specifications

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

## Ordering variants

- `AS431ANTR-G1`
- `AS431ANTR-G1BNTR-G1`
- `AS431ANTR-G1ANTR-E1`
- `AS431ANTR-G1BNTR-E1`
- `AS431ANTR-G1AKTR-G1`
- `AS431ANTR-G1BKTR-G1`
- `AS431ANTR-G1AKTR-E1`
- `AS431ANTR-G1BKTR-E1`
- `AS431ANTR-G1ARTR-G1`
- `AS431ANTR-G1BRTR-G1`
- `AS431ANTR-G1ARTR-E1`
- `AS431ANTR-G1BRTR-E1`
- `AS431ANTR-G1AZ-G1`
- `AS431ANTR-G1AZTR-G1`
- `AS431ANTR-G1BZ-G1`
- `AS431ANTR-G1BZTR-G1`
- `AS431ANTR-G1AZ-E1`
- `AS431ANTR-G1AZTR-E1`
- `AS431ANTR-G1BZ-E1`
- `AS431ANTR-G1BZTR-E1`

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Cathode Voltage (recommended operating) | VKA |  |  | 36 | V | Min printed as VREF (not a numeric value) | 4 |
| Cathode Current (recommended operating) | IKA | 1 |  | 100 | mA |  | 4 |
| Operating Ambient Temperature Range | TA | -40 |  | 125 | °C |  | 4 |
| Cathode Voltage (absolute maximum) | VKA |  |  | 40 | V |  | 4 |
| Cathode Current Range (continuous, absolute maximum) | IKA | -100 |  | 150 | mA | Continuous | 4 |
| Reference Input Current Range (absolute maximum) | IREF |  |  | 10 | mA | Printed as a single value, recorded as max | 4 |
| Power Dissipation (N package, SOT23) | PD |  |  | 370 | mW | N, K package | 4 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage Temperature Range | TSTG | -65 |  | 150 | °C |  | 4 |
| ESD (Human Body Model) | ESD |  |  | 2000 | V | Human Body Model | 4 |
| Reference Voltage (0.5% grade) | VREF | 2.487 | 2.5 | 2.512 | V | VKA = VREF, IKA = 10mA | 5 |
| Deviation of Reference Voltage over temperature 0 to +70°C | ΔVREF |  | 4.5 | 8 | mV | VKA = VREF, IKA = 10mA, 0 to +70°C | 5 |
| Deviation of Reference Voltage over temperature -40 to +85°C | ΔVREF |  | 4.5 | 10 | mV | VKA = VREF, IKA = 10mA, -40 to +85°C | 5 |
| Deviation of Reference Voltage over temperature -40 to +125°C | ΔVREF |  | 4.5 | 16 | mV | VKA = VREF, IKA = 10mA, -40 to +125°C | 5 |
| Ratio of Change in Reference Voltage to Change in Cathode Voltage (10V to VREF) | ΔVREF/ΔVKA |  | -1 | -2.7 | mV/V | IKA = 10mA, ΔVKA = 10V to VREF | 5 |
| Ratio of Change in Reference Voltage to Change in Cathode Voltage (36V to 10V) | ΔVREF/ΔVKA |  | -0.5 | -2 | mV/V | IKA = 10mA, ΔVKA = 36V to 10V | 5 |
| Reference Current | IREF |  | 0.7 | 4 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 5 |
| Deviation of Reference Current over full temperature range | ΔIREF |  | 0.4 | 1.2 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞, TA = -40 to +125°C | 5 |
| Minimum Cathode Current for Regulation | IKA(Min) |  | 0.4 | 1 | mA | VKA = VREF | 5 |
| Off-state Cathode Current | IKA(Off) |  | 0.05 | 1 | µA | VKA = 36V, VREF = 0 | 5 |
| Dynamic Impedance | ZKA |  | 0.15 | 0.5 | Ω | VKA = VREF, IKA = 1 to 100mA, f ≤ 1.0kHz | 5 |
| Thermal Resistance (SOT23) | θJC |  | 135.9 |  | °C/W |  | 5 |

## CAD (KiCad official)

- Symbol: `AS431ANTR-G1`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `as431antr-g1-etched.step` / `as431antr-g1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `as431antr-g1.step` / `as431antr-g1.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`as431antr-g1.step`](as431antr-g1.step) | 59 KB | You want the bare part, or you mark your own boards. |
| [`as431antr-g1-etched.step`](as431antr-g1-etched.step) | 1.8 MB | You want the part with `AS431ANTR-G1` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 457 faces against 69 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/AS431ANTR-G1.pdf) (20 pp, sha256 `03f54aac77941ed9`, 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/as431antr-g1-datasheet.pdf)