# TL431AILPG

**onsemi** · Voltage Reference · TO-92

TL431AILPG 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 | Reference | input | Reference input (REF) that sets the programmed output voltage through the external resistor divider; the datasheet gives a reference input current range of -0.05 to +10 mA continuous and a Vref of 2.5 V. |
| 2 | Anode | passive | Common anode terminal; the cathode-to-anode voltage must stay between Vref and 36 V in recommended operation, with a 37 V absolute maximum. |
| 3 | Cathode | passive | Cathode terminal of the shunt regulator, which carries 1.0 to 100 mA in recommended operation and 150 mA maximum continuous (-100 to +150 mA range). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TO-92 |
| Category | Power Management (PMIC) |
| 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, TA = 25°C | Vref | 2.47 | 2.495 | 2.52 | V | VKA = Vref, IK = 10 mA, TA = 25°C | 4 |
| Reference Input Voltage, TA = Tlow to Thigh | Vref | 2.44 |  | 2.55 | V | VKA = Vref, IK = 10 mA, TA = Tlow to Thigh (Note 6) | 4 |
| Reference Input Voltage Deviation Over Temperature Range | Vref |  | 7 | 30 | mV | VKA = Vref, IK = 10 mA | 4 |
| Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage (VKA = 10 V to Vref) | Vref |  | -1.4 | -2.7 | mV/V | IK = 10 mA (Figure 2), VKA = 10 V to Vref | 4 |
| Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage (VKA = 36 V to 10 V) | VKA |  | -1 | -2 | mV/V | IK = 10 mA (Figure 2), VKA = 36 V to 10 V | 4 |
| Reference Input Current, TA = 25°C | Iref |  | 1.1 | 2 | μA | IK = 10 mA, R1 = 10 k, R2 = ∞, TA = 25°C | 4 |
| Reference Input Current, TA = Tlow to Thigh | Iref |  |  | 4 | μA | IK = 10 mA, R1 = 10 k, R2 = ∞, TA = Tlow to Thigh (Note 6) | 4 |
| Reference Input Current Deviation Over Temperature Range | Iref |  | 0.8 | 2.5 | μA | IK = 10 mA, R1 = 10 k, R2 = ∞ | 4 |
| Minimum Cathode Current For Regulation | Imin |  | 0.5 | 1 | mA | VKA = Vref (Figure 1) | 4 |
| Off-State Cathode Current | Ioff |  | 20 | 1000 | nA | VKA = 36 V, Vref = 0 V | 4 |
| Dynamic Impedance | /ZKA/ |  | 0.22 | 0.5 | Ω | VKA = Vref, IK = 1.0 mA to 100 mA, f ≤ 1.0 kHz | 4 |
| Cathode to Anode Voltage (maximum rating) | VKA |  |  | 37 | V |  | 2 |
| Cathode Current Range, Continuous | IK | -100 |  | 150 | mA |  | 2 |
| Reference Input Current Range, Continuous | Iref | -0.05 |  | 10 | mA |  | 2 |
| Operating Junction Temperature | TJ |  |  | 150 | °C |  | 2 |
| Operating Ambient Temperature Range (TL431AI) | TA | -40 |  | 85 | °C | Full operating ambient temperature range, TL431AI grade | 2 |
| Storage Temperature Range | Tstg | -65 |  | 150 | °C |  | 2 |
| ESD Human Body Model | HBM | 2000 |  |  | V | Per JEDEC JESD22-A114F; printed as >2000 | 2 |
| ESD Machine Model | MM | 200 |  |  | V | Per JEDEC JESD22-A115C; printed as >200 | 2 |
| ESD Charged Device Model | CDM | 500 |  |  | V | Per JEDEC JESD22-C101E; printed as >500 | 2 |
| Cathode to Anode Voltage (recommended) | VKA |  |  | 36 | V | Minimum printed as Vref (symbolic, not numeric) | 2 |
| Cathode Current (recommended) | IK | 1 |  | 100 | mA |  | 2 |
| Derating above 25°C Ambient Temperature, D/LP Suffix Plastic Package | PD |  | 0.7 |  | W | Derate above 25°C ambient temperature, D and LP suffix plastic package | 2 |
| Derating above 25°C Case Temperature, D/LP Suffix Plastic Package | PD |  | 1.5 |  | W | Derate above 25°C case temperature, D and LP suffix plastic package | 2 |
| Thermal Resistance, Junction-to-Ambient (LP Suffix, TO-92) | RJA |  | 178 |  | °C/W | LP suffix package | 3 |
| Thermal Resistance, Junction-to-Case (LP Suffix, TO-92) | RJC |  | 83 |  | °C/W | LP suffix package | 3 |
| Reference Voltage Tolerance (ordering table, TL431AILPG) |  |  | 1 |  | % |  | 13 |

## CAD (KiCad official)

- Symbol: `TL431AILPG`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `tl431ailpg-etched.step` / `tl431ailpg-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl431ailpg.step` / `tl431ailpg.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588890167533326336) (22 pp, sha256 `c82bb95655b732ca`, retrieved 2026-10-09, 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/tl431ailpg-datasheet.pdf)