LM431AIZ

Texas Instruments · Voltage Reference · TO-92-3

LM431AIZ from Texas Instruments, in a TO-92-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	Cathode	bidirectional	Shunt current/output voltage pin; the datasheet limits cathode voltage to 37 V and continuous cathode current to -10 to 150 mA absolute maximum, with 1 to 100 mA recommended.
2	Reference	input	Reference pin for setting the adjustable output voltage (VREF is 2.5 V typical per the device description), with reference input current limited to 10 mA absolute maximum.
3	Anode	power_in	Anode pin, normally grounded; the datasheet lists it as an output (O) type, but it is classed here as power_in because it is the normally grounded common terminal.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TO-92-3
Category	Power Management (PMIC)
Pins	3

CAD (KiCad official)

Symbol: LM431AIZ
Footprint: Package_TO_SOT_THT:TO-92_Inline
3D model: TO-92-3 (KiCad packages3D, STEP)
3D model files: lm431aiz-etched.step / lm431aiz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm431aiz.step / lm431aiz.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (37 pp, sha256 9c0bcff4967eaad2, retrieved 2026-10-08, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

# LM431AIZ

**Texas Instruments** · Voltage Reference · TO-92-3

LM431AIZ from Texas Instruments, in a TO-92-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | Cathode | bidirectional | Shunt current/output voltage pin; the datasheet limits cathode voltage to 37 V and continuous cathode current to -10 to 150 mA absolute maximum, with 1 to 100 mA recommended. |
| 2 | Reference | input | Reference pin for setting the adjustable output voltage (VREF is 2.5 V typical per the device description), with reference input current limited to 10 mA absolute maximum. |
| 3 | Anode | power_in | Anode pin, normally grounded; the datasheet lists it as an output (O) type, but it is classed here as power_in because it is the normally grounded common terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-92-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `LM431AIZ`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92-3 (KiCad packages3D, STEP)
- 3D model files: `lm431aiz-etched.step` / `lm431aiz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm431aiz.step` / `lm431aiz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lm431) (37 pp, sha256 `9c0bcff4967eaad2`, retrieved 2026-10-08, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/lm431aiz-datasheet.pdf)