component
TL431AQPK
Public Made by Adomby adom
Texas Instruments Voltage References, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownTL431AQPK
Texas Instruments · Voltage References · SOT-89-3
TL431AQPK from Texas Instruments, in a SOT-89-3. 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 | REF | input | Threshold reference input relative to the common anode; it cannot be left floating (IREF ≥ 4µA needed) and is regulated to about 2.5V (Vref), with input current abs max of 10mA. |
| 2 | ANODE | power_in | Common pin, normally connected to ground. |
| 3 | CATHODE | bidirectional | Shunt current/voltage input, operated from Vref to 36V (37V abs max) with 1mA to 100mA continuous cathode current. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-89-3 |
| 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 Voltage | Vref | 2470 | 2495 | 2520 | mV | VKA = Vref, IKA = 10mA | 11 |
| Deviation of reference input voltage over full temperature range | VI(dev) | 14 | 34 | mV | VKA = Vref, IKA = 10mA | 11 | |
| Ratio of change in reference voltage to change in cathode voltage (VKA = 10V - Vref) | ΔVref/ΔVKA | -1.4 | -2.7 | mV/V | IKA = 10mA, ΔVKA = 10V- Vref | 11 | |
| Ratio of change in reference voltage to change in cathode voltage (VKA = 36V - 10V) | ΔVref/ΔVKA | -1 | -2 | mV/V | IKA = 10mA, ΔVKA = 36V- 10V | 11 | |
| Reference Input Current | Iref | 2 | 4 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 11 | |
| Deviation of reference input current over full temperature range | II(dev) | 0.8 | 2.5 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 11 | |
| Minimum cathode current for regulation | Imin | 0.4 | 0.7 | mA | VKA = Vref | 11 | |
| Off-state cathode current | Ioff | 0.1 | 0.5 | µA | VKA = 36V, Vref = 0 | 11 | |
| Dynamic Impedance | /ZKA/ | 0.2 | 0.5 | Ω | VKA = Vref, f ≤ kHz, IKA = 1mA to 100mA | 11 | |
| Cathode Voltage | VKA | 37 | V | with respect to ANODE | 5 | ||
| Continuous Cathode Current Range | IKA | -100 | 150 | mA | 5 | ||
| Reference Input Current | II(ref) | -0.05 | 10 | mA | 5 | ||
| Operating Junction Temperature Range | TJ | 150 | °C | 5 | |||
| Storage Temperature Range | Tstg | -65 | 150 | °C | 5 | ||
| Continuous Cathode Current Range | IKA | 1 | 100 | mA | 5 | ||
| Operating Free-Air Temperature | TA | -40 | 125 | °C | TL43xxQ | 5 | |
| Junction-to-ambient thermal resistance | RθJA | 52 | °C/W | PK package | 5 | ||
| Junction-to-case (top) thermal resistance | RθJC(top) | 9 | °C/W | PK package | 5 | ||
| ESD HBM | V(ESD) | -2000 | 2000 | V | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 | 5 | |
| ESD CDM | V(ESD) | -1000 | 1000 | V | Charged-device model (CDM), per JEDEC specification JESD22-C101 | 5 |
CAD (KiCad official)
- Symbol:
TL431AQPK - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files:
tl431aqpk-etched.step/tl431aqpk-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431aqpk.step/tl431aqpk.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (85 pp, sha256
ed2e90697de4e2c5, retrieved 2026-10-27, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).