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LM431ASF

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HTC Korea TAEJIN Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM431ASF

HTC Korea TAEJIN Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23

LM431ASF from HTC Korea TAEJIN Tech, 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 CATHODE passive Cathode of the shunt regulator, which the datasheet's pin table labels as input supply voltage; recommended cathode voltage is VREF to 40 V, recommended cathode current is 0.5 to 100 mA, and absolute maximum cathode voltage is 42 V.
2 ANODE power_in Anode, which the datasheet's pin table labels as ground; the reference is taken relative to this pin.
3 REFERENCE input Reference voltage input, 2.475 to 2.525 V for the LM431A at VKA = VREF and IK = 10 mA, with reference input current range of -0.05 to 10 mA (absolute maximum).

Key specifications

Parameter Value
Manufacturer HTC Korea TAEJIN Tech
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 (LM431A) VREF 2.475 2.5 2.525 V VKA=VREF, IK=10mA 4
Deviation of Reference Input Voltage ΔVREF/ΔT 15 30 mV VKA=VREF, IK=10mA, TA=Full Range 4
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage ΔVREF/ΔVKA -1.4 -2.7 mV/V IK=10mA, ΔVKA=10V to VREF 4
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage ΔVREF/ΔVKA -1 -2 mV/V IK=10mA, ΔVKA=36V to 10V 4
Reference Input Current IREF 1.8 4 µA IKA=10mA, R1=10kΩ, R2=∞ 4
Deviation of Reference Input Current ΔIREF/ΔT 0.4 1.2 µA IK=10mA, R1=10kΩ, R2=∞, TA=Full Range 4
Minimum Cathode Current for Regulation IK(MIN) 0.5 mA VKA=VREF 4
Off-State Cathode Current IK(OFF) 0.17 0.9 µA VKA=36V, VREF=0 4
Dynamic Impedance ZKA 0.27 0.5 Ω VKA=VREF, IK=1mA~100mA, f≤1kHz 4
Cathode Voltage (recommended) VKA 40 V 2
Cathode Current (recommended) IKA 0.5 100 mA 2
Operating Temperature Range TOPR -40 125 °C 2
Cathode Voltage (absolute maximum) VKA 42 V 1
Cathode Current Range IKA -100 150 mA 1
Reference Input Current Range IREF -0.05 10 mA 1
Junction Temperature Range TJ -40 150 °C 1
Storage Temperature Range TSTG -65 150 °C 1

CAD (KiCad official)

  • Symbol: LM431ASF
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: lm431asf-etched.step / lm431asf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm431asf.step / lm431asf.glb are the bare package body.

Provenance

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

  • Datasheet: HTC Korea TAEJIN Tech datasheet (11 pp, sha256 17dd2d49771567a3, retrieved 2026-10-18, 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