# AP431SARTR-G1

**Diodes Incorporated** · Voltage Reference · SOT-89-3

AP431SARTR-G1 from Diodes Incorporated, in a SOT-89-3. 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. Feedback sense input compared against the internal 2.500V (AP431SA/B) / 2.495V (AP431SHA/B) bandgap reference by the internal error amplifier. Typical reference input current 0.2µA (0.5µA max) at IKA=1mA, R1=10kΩ. Absolute maximum IREF = 10mA. |
| 2 | ANODE | power_in | Anode terminal (device return/ground). Emitter of the internal shunt transistor and low-side of the internal amplifier - typically connected to circuit ground in a shunt regulator configuration. |
| 3 | CATHODE | power_in | Cathode terminal (shunt regulation node). Sinks current from the regulated node when VKA rises above the programmed threshold. Recommended operating VKA range: VREF to 36V; IKA range 0.1mA to 100mA. Absolute maximum VKA = 40V; continuous IKA = -100 to 150mA. Dynamic impedance 0.1Ω typ. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-89-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `AP431SARTR-G1`
- `AP431SARTR-G1HAR`
- `AP431SARTR-G1BR`
- `AP431SARTR-G1HBR`
- `AP431SARTR-G1AN`
- `AP431SARTR-G1AN1`
- `AP431SARTR-G1HAN`
- `AP431SARTR-G1HAN1`
- `AP431SARTR-G1BN`
- `AP431SARTR-G1BN1`
- `AP431SARTR-G1HBN`
- `AP431SARTR-G1HBN1`
- `AP431SARTR-G1AZ`
- `AP431SARTR-G1HAZ`
- `AP431SARTR-G1BZ`
- `AP431SARTR-G1HBZ`

## 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 (AP431SA, 0.5%) | VREF | 2.487 | 2.5 | 2.512 | V | VKA = VREF, IKA = 1mA | 5 |
| Deviation of Reference Voltage over Full Temperature Range | VREF |  | 3 | 6 | mV | VKA = VREF, IKA = 1mA, 0°C to +70°C | 5 |
| Deviation of Reference Voltage over Full Temperature Range | VREF |  | 6 | 10 | mV | VKA = VREF, IKA = 1mA, -40°C to +85°C | 5 |
| Deviation of Reference Voltage over Full Temperature Range | VREF |  | 11 | 18 | mV | VKA = VREF, IKA = 1mA, -40°C to +125°C | 5 |
| Ratio of Change in Reference Voltage to Change in Cathode Voltage | VREF/VKA |  | -1 | -2.7 | mV/V | IKA = 1mA, VKA = 10V to VREF | 5 |
| Ratio of Change in Reference Voltage to Change in Cathode Voltage | VREF/VKA |  | -0.5 | -2 | mV/V | IKA = 1mA, VKA = 36V to 10V | 5 |
| Reference Current | IREF |  | 0.2 | 0.5 | µA | IKA = 1mA, R1 = 10kΩ | 5 |
| Deviation of Reference Current over Full Temperature Range | IREF |  | 0.1 | 0.3 | µA | IKA = 1mA, R1 = 10kΩ, TA = -40°C to +125°C | 5 |
| Minimum Cathode Current for Regulation | IKA (Min) |  | 50 | 100 | µA | VKA = VREF | 5 |
| Off-state Cathode Current | IKA (Off) |  | 0.05 | 1 | µA | VKA = 36V, VREF = 0 | 5 |
| Dynamic Impedance | ZKA |  | 0.1 | 0.3 | Ω | VKA = VREF, IKA = 1mA to 100mA, f 1.0kHz | 5 |
| Cathode Voltage (recommended) | VKA |  |  | 36 | V |  | 4 |
| Cathode Current (recommended) | IKA | 0.1 |  | 100 | mA |  | 4 |
| Operating Ambient Temperature Range | TA | -40 |  | 125 | °C |  | 4 |
| Cathode Voltage (absolute maximum) | VKA |  |  | 40 | V |  | 4 |
| Cathode Current Range (Continuous) | IKA | -100 |  | 150 | mA | Continuous | 4 |
| Reference Input Current Range | IREF |  |  | 10 | mA |  | 4 |
| Power Dissipation (SOT89) | PD |  |  | 750 | mW | SOT89 | 4 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage Temperature Range | TSTG | -65 |  | 150 | °C |  | 4 |
| ESD (Human Body Model) | ESD |  |  | 5500 | V | Human Body Model | 4 |
| ESD (Machine Model) | ESD |  |  | 300 | V | Machine Model | 4 |
| Thermal Resistance Junction-to-Case (SOT89) | θJC |  | 80 |  | °C/W | SOT89 | 5 |

## CAD (KiCad official)

- Symbol: `AP431SARTR-G1`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files: `ap431sartr-g1-etched.step` / `ap431sartr-g1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ap431sartr-g1.step` / `ap431sartr-g1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Diodes Incorporated datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8560088301572562944) (None pp, sha256 `770b9144c5e6fc10`, 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/ap431sartr-g1-datasheet.pdf)