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TL431BCPK

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Texas Instruments Voltage Reference, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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docs tl431bcpk: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers tl431bcpk: viewers · Ray 1mo ago
package.json tl431bcpk: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray 1mo ago
page.json tl431bcpk: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray 25d ago
README.md tl431bcpk: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray 25d ago
tl431bcpk-etched.fit.json tl431bcpk: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431bcpk-etched.glb tl431bcpk: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431bcpk-etched.step tl431bcpk: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
tl431bcpk.glb Publish 0.1.0 · Ray 1mo ago
tl431bcpk.kicad_mod Publish 0.1.0 · Ray 1mo ago
tl431bcpk.kicad_sym Publish 0.1.0 · Ray 1mo ago
tl431bcpk.lbr Publish 0.1.0 · Ray 1mo ago
tl431bcpk.step Publish 0.1.0 · Ray 1mo ago

TL431BCPK

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431bcpk.step / tl431bcpk.glb are 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, primary claude-haiku-4-5-20251001 (text), consensus claude-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).

Datasheet PDF