component
TL431BIPK
Public Made by Adomby adom
Texas Instruments Voltage Reference, 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
markdownTL431BIPK
Texas Instruments · Voltage Reference · SOT-89-3
TL431BIPK from Texas Instruments, 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 threshold input compared to internal 2.5V reference; requires minimum 4µA bias current. |
| 2 | ANODE | power_in | Common anode return pin typically connected to ground; serves as reference for all voltage and current measurements. |
| 3 | CATHODE | output | Shunt regulator output with programmable voltage from 2.5V to 36V; output impedance 0.2Ω typical with 1-100mA sink current capability. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-89-3 |
| 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 voltage | Vref | 2483 | 2495 | 2507 | mV | VKA = Vref, IKA = 10mA | 14 |
| Reference voltage deviation over full temperature range | VI(dev) | 14 | 34 | mV | VKA = Vref, IKA = 10mA | 14 | |
| Ratio of change in reference voltage to change in cathode voltage | ΔVref/ΔVKA | -1.4 | -2.7 | mV/V | IKA = 10mA; ΔVKA = 10V - Vref | 14 | |
| Ratio of change in reference voltage to change in cathode voltage | ΔVref/ΔVKA | -1 | -2 | mV/V | IKA = 10mA; ΔVKA = 36V - 10V | 14 | |
| Reference input current | Iref | 2 | 4 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 14 | |
| Reference input current deviation over full temperature range | II(dev) | 0.8 | 2.5 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 14 | |
| Minimum cathode current for regulation | Imin | 0.4 | 0.7 | mA | VKA = Vref | 14 | |
| Off-state cathode current | Ioff | 0.1 | 0.5 | µA | VKA = 36V, Vref = 0 | 14 | |
| Dynamic impedance | /ZKA/ | 0.2 | 0.5 | Ω | VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA | 14 | |
| Cathode voltage (recommended operating) | VKA | 36 | V | 6 | |||
| Continuous cathode current range (recommended operating) | IKA | 1 | 100 | mA | 6 | ||
| Operating free-air temperature range (TL43xxI) | TA | -40 | 85 | °C | Free-air, natural ventilation | 6 | |
| Cathode voltage (absolute maximum) | VKA | 37 | V | Referenced to ANODE | 6 | ||
| Continuous cathode current range (absolute maximum) | IKA | -100 | 150 | mA | 6 | ||
| Reference input current (absolute maximum) | II(ref) | -0.05 | 10 | mA | 6 | ||
| Operating junction temperature range | TJ | 150 | °C | 6 | |||
| Storage temperature range | Tstg | -65 | 150 | °C | 6 | ||
| Junction-to-ambient thermal resistance (PK package) | RθJA | 52 | °C/W | PK package column of thermal table | 6 | ||
| Junction-to-case (top) thermal resistance (PK package) | RθJC(top) | 9 | °C/W | PK package column of thermal table | 6 |
CAD (KiCad official)
- Symbol:
TL431BIPK - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files:
tl431bipk-etched.step/tl431bipk-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431bipk.step/tl431bipk.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (86 pp, sha256
313277b9351e61ed, retrieved 2026-09-22, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).