component
TL431BCPK
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
markdownTL431BCPK
Texas Instruments · Voltage Reference · SOT-89-3
TL431BCPK 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 | Reference/control input relative to ANODE; the internal amplifier forces this node to the internal threshold (Vref = 2483 mV min / 2495 mV typ / 2507 mV max for the BC grade at IKA=10 mA) and requires a reference input current of typically 2 µA (max 4 µA) to bias the internal NPN, so it must not be left floating. |
| 2 | ANODE | passive | Common/reference terminal of the device, normally connected to ground, serving as the return path for cathode current. |
| 3 | CATHODE | passive | Shunt current/voltage node that sinks a regulated cathode current over the recommended range of 1 mA to 100 mA (absolute maximum -100 mA to 150 mA) at a cathode voltage from Vref up to 36 V (absolute maximum 37 V). |
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 (grade B, 25°C) | Vref | 2483 | 2495 | 2507 | mV | VKA = Vref, IKA = 10mA | 13 |
| Reference voltage deviation over temperature range | VI(dev) | 6 | 16 | mV | VKA = Vref, IKA = 10mA | 13 | |
| Reference voltage change ratio, cathode step 10V to Vref | ΔVref/ΔVKA | -1.4 | -2.7 | mV/V | IKA = 10mA, ΔVKA = 10V - Vref | 13 | |
| Reference voltage change ratio, cathode step 36V to 10V | ΔVref/ΔVKA | -1 | -2 | mV/V | IKA = 10mA, ΔVKA = 36V - 10V | 13 | |
| Reference input current | Iref | 2 | 4 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 13 | |
| Reference input current deviation over temperature range | II(dev) | 0.8 | 1.2 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 13 | |
| Minimum cathode current for regulation | Imin | 0.4 | 0.6 | mA | VKA = Vref | 13 | |
| Off-state cathode current | Ioff | 0.1 | 0.5 | µA | VKA = 36V, Vref = 0 | 13 | |
| Dynamic impedance | /ZKA/ | 0.2 | 0.5 | Ω | VKA = Vref, f ≤ 1kHz, IKA = 1mA to 100mA | 13 | |
| Cathode voltage | VKA | 37 | V | 6 | |||
| Continuous cathode current range | IKA | -100 | 150 | mA | 6 | ||
| Reference input current | II(ref) | -0.05 | 10 | mA | 6 | ||
| Operating junction temperature range | TJ | 150 | °C | 6 | |||
| Storage temperature range | Tstg | -65 | 150 | °C | 6 | ||
| Cathode voltage (recommended) | VKA | 36 | V | 6 | |||
| Continuous cathode current range (recommended) | IKA | 1 | 100 | mA | 6 | ||
| Operating free-air temperature range (TL43xxC grade) | TA | 0 | 70 | °C | TL43xxC, natural air | 6 | |
| Junction-to-ambient thermal resistance (PK package) | RθJA | 52 | °C/W | 6 | |||
| Junction-to-case (top) thermal resistance (PK package) | RθJC(top) | 9 | °C/W | 6 |
CAD (KiCad official)
- Symbol:
TL431BCPK - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files:
tl431bcpk-etched.step/tl431bcpk-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);tl431bcpk.step/tl431bcpk.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 2026-09-24, 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).