# AS431BNTR-G1

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

AS431BNTR-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 to the internal error amplifier. Regulates the cathode current so this pin sits at VREF = 2.500 V above ANODE. Typical input bias current IREF = 0.7 uA (max 4 uA); absolute-max reference input current 10 mA. |
| 2 | CATHODE | power_in | Cathode of the internal shunt element. Sinks 1 mA to 100 mA in normal regulation; absolute-max cathode voltage 40 V, recommended operating range VREF (2.5 V) to 36 V. Off-state leakage 0.05 uA typ at VKA = 36 V. Dynamic impedance 0.15 Ω typ. |
| 3 | ANODE | power_in | Anode / common return of the shunt regulator. Reference is measured with respect to this pin; usually tied to circuit ground in shunt-regulator configurations. |

## Key specifications

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

## Ordering variants

- `AS431BNTR-G1ANTR-E1`
- `AS431BNTR-G1BNTR-E1`
- `AS431BNTR-G1ANTR-G1`
- `AS431BNTR-G1`
- `AS431BNTR-G1AKTR-E1`
- `AS431BNTR-G1BKTR-E1`
- `AS431BNTR-G1AKTR-G1`
- `AS431BNTR-G1BKTR-G1`
- `AS431BNTR-G1ARTR-E1`
- `AS431BNTR-G1BRTR-E1`
- `AS431BNTR-G1ARTR-G1`
- `AS431BNTR-G1BRTR-G1`
- `AS431BNTR-G1AZ-E1`
- `AS431BNTR-G1AZTR-E1`
- `AS431BNTR-G1BZ-E1`
- `AS431BNTR-G1BZTR-E1`
- `AS431BNTR-G1AZ-G1`
- `AS431BNTR-G1AZTR-G1`
- `AS431BNTR-G1BZ-G1`
- `AS431BNTR-G1BZTR-G1`

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reference Voltage (1.0% grade) | VREF | 2.475 | 2.5 | 2.525 | V | VKA = VREF, IKA = 10mA | 5 |
| Deviation of Reference Voltage Over Full Temperature Range (0 to +70°C) | ∆VREF |  | 4.5 | 8 | mV | VKA = VREF, IKA = 10mA, 0 to +70°C | 5 |
| Deviation of Reference Voltage Over Full Temperature Range (-40 to +85°C) | ∆VREF |  | 4.5 | 10 | mV | VKA = VREF, IKA = 10mA, -40 to +85°C | 5 |
| Deviation of Reference Voltage Over Full Temperature Range (-40 to +125°C) | ∆VREF |  | 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) | ∆VREF/∆VKA |  | -1 | -2.7 | mV/V | IKA = 10mA, ∆VKA = 10V to VREF | 5 |
| Ratio of Change in Reference Voltage to Change in Cathode Voltage (36V to 10V) | ∆VREF/∆VKA |  | -0.5 | -2 | mV/V | IKA = 10mA, ∆VKA = 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 | ∆IREF |  | 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 |
| Cathode Voltage (recommended operating) | VKA |  |  | 36 | V |  | 4 |
| Cathode Current (recommended operating) | IKA | 1 |  | 100 | mA |  | 4 |
| Operating Ambient Temperature Range | TA | -40 |  | 125 | °C |  | 4 |
| Cathode Voltage | VKA |  |  | 40 | V |  | 4 |
| Cathode Current Range (Continuous) | IKA | -100 |  | 150 | mA | Continuous | 4 |
| Reference Input Current Range | IREF |  |  | 10 | mA |  | 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 |
| Thermal Resistance (SOT23) | θJC |  | 135.9 |  | °C/W | SOT23 | 5 |

## CAD (KiCad official)

- Symbol: `AS431BNTR-G1`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `as431bntr-g1-etched.step` / `as431bntr-g1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `as431bntr-g1.step` / `as431bntr-g1.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`as431bntr-g1.step`](as431bntr-g1.step) | 59 KB | You want the bare part, or you mark your own boards. |
| [`as431bntr-g1-etched.step`](as431bntr-g1-etched.step) | 1.9 MB | You want the part with `AS431BNTR-G1` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 486 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](docs/as431bntr-g1-datasheet.pdf) (20 pp, sha256 `03f54aac77941ed9`, 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/as431bntr-g1-datasheet.pdf)