# LM431CCZ

**onsemi** · Voltage References · TO-92

LM431CCZ from onsemi, in a TO-92. 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 | Ref | input | Reference input of the programmable shunt regulator, where VREF is approximately 2.5 V and the output is set with two external resistors up to 36 V. |
| 2 | Anode | passive | Anode terminal of the three-terminal adjustable regulator, through which the cathode current returns. |
| 3 | Cathode | output | Cathode output of the regulator, with recommended cathode voltage from VREF to 36 V and cathode current from 1.0 to 100 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TO-92 |
| Category | Power Management ICs |
| Pins | 3 |

## 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 Input Voltage | VREF | 2.482 | 2.495 | 2.508 | V | VKA = VREF, IKA = 10 mA | 3 |
| Deviation of Reference Input Voltage Over-Temperature | VREF/T |  | 4.5 | 17 | mV | VKA = VREF, IKA = 10 mA, TMIN ≤ TA ≤ TMAX (Note 1) | 3 |
| Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage | VREF/VKA |  | -1 | -2.7 | mV/V | IKA = 10 mA, VKA = 10 V−VREF | 3 |
| Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage | VREF/VKA |  | -0.5 | -2 | mV/V | IKA = 10 mA, VKA = 36 V−10 V | 3 |
| Reference Input Current | IREF |  | 1.5 | 4 | A | IKA = 10 mA, R1 = 10 k, R2 = ∞ | 3 |
| Deviation of Reference Input Current Over Full Temperature Range | IREF/T |  | 0.4 | 1.2 | A | IKA = 10 mA, R1 = 10 k, R2 = ∞, TA = Full Range | 3 |
| Minimum Cathode Current for Regulation | IKA(MIN) |  | 0.45 | 1 | mA | VKA = VREF | 3 |
| Off-Stage Cathode Current | IKA(OFF) |  | 0.05 | 1 | A | VKA = 36 V, VREF = 0 | 3 |
| Dynamic Impedance | ZKA |  | 0.15 | 0.5 |  | VKA = VREF, IKA = 1 to 100 mA, f ≥ 1.0 kHz | 3 |
| Cathode Voltage | VKA |  |  | 36 | V |  | 3 |
| Cathode Current | IKA | 1 |  | 100 | mA |  | 3 |
| Output Voltage Tolerance (LM431CCZ) |  | -0.5 |  | 0.5 | % | LM431CCZ, Output Voltage Tolerance 0.5% | 7 |
| Cathode Voltage | VKA |  |  | 37 | V |  | 3 |
| Cathode Current Range (Continuous) | IKA | -100 |  | 150 | mA |  | 3 |
| Reference Input Current Range | IREF | -0.05 |  | 10 | mA |  | 3 |
| Power Dissipation | PD |  |  | 770 | mW |  | 3 |
| Thermal Resistance, Junction to Ambient | RθjA |  |  | 160 | °C/W |  | 3 |
| Operating Temperature Range − LM431xC | TOPR | -25 |  | 85 | °C | LM431xC | 3 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 3 |
| Storage Temperature Range | TSTG | -65 |  | 150 | °C |  | 3 |

## CAD (KiCad official)

- Symbol: `LM431CCZ`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `lm431ccz-etched.step` / `lm431ccz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm431ccz.step` / `lm431ccz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/lm431ccz-d.pdf) (10 pp, sha256 `1426c7f876f1bc6f`, retrieved 2026-10-28, tier: manufacturer)
- **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/lm431ccz-datasheet.pdf)