component

TL431LA

Public Made by Adom

by adom

PJSEMI Voltage Reference, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TL431LA

PJSEMI · Voltage Reference · SOT-23

TL431LA from PJSEMI, in a SOT-23. 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 input that sets the cathode voltage through an external R1/R2 divider, with Vref of 2.5V (2.488V to 2.512V for the 0.5% TL431LA) and typical input current of 1 µA.
2 CATHODE passive Cathode (K) of the programmable shunt reference, regulating from VREF to 36V (37V absolute maximum) with cathode current of 0.5mA to 100mA.
3 ANODE power_in Anode (A) of the shunt reference, normally connected to the lowest potential (ground).

Key specifications

Parameter Value
Manufacturer PJSEMI
Package SOT-23
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 VREF 2.488 2.5 2.512 V VKA=VREF, IKA=10mA, Fig1 (TL431LA 0.5% row) 5
Deviation of Reference Input Voltage Over Temperature ΔVREF 16 25 mV VKA=VREF, IKA=10mA, TMIN ≤ TA ≤ TMAX, Fig1 5
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (10V to VREF) ΔVREF/ΔVKA -1 -2.7 mV/V IKA=10mA, ΔVKA=10V~VREF, Fig2 5
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (36V to 10V) ΔVREF/ΔVKA -1 -2 mV/V IKA=10mA, ΔVKA=36V~10V, Fig2 5
Reference Input Current IREF 1 2 µA IKA=10mA, R1=10KΩ, R2=∞, Fig2 5
Deviation of Reference Input Current Over Full Temperature Range ΔIREF 0.2 0.4 µA IKA=10mA, R1=10KΩ, R2=∞, TA=full Temperature, Fig2 5
Minimum Cathode Current for Regulation IKA(MIN) 50 85 µA VKA=VREF, Fig1 5
Off-State Cathode Current IKA(OFF) 0.05 0.5 µA VKA=36V, VREF=0, Fig3 5
Dynamic Impedance ZKA 0.2 0.5 Ω VKA=VREF, IKA=1~100mA, f≤1.0KHz 5
Cathode Voltage (recommended maximum) VKA 36 V 4
Cathode Current IKA 0.5 100 mA 4
Cathode Voltage VKA 37 V 4
Cathode Current Range (Continuous) IKA -100 150 mA Continuous 4
Reference Input Current Range IREF -0.05 10 mA 4
Operating Temperature TOPR -40 125 °C 4
Storage Temperature Range TSTG -65 150 °C 4
Junction-to-Ambient Thermal Resistance RθJA 416 °C/W SOT-23 package 4

CAD (KiCad official)

  • Symbol: TL431LA
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: tl431la-etched.step / tl431la-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431la.step / tl431la.glb are the bare package body.

Provenance

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

  • Datasheet: PJSEMI datasheet (11 pp, sha256 856fea739613191f, retrieved 2026-10-17, 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