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TL431ASF

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

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Contents

README

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TL431ASF

HTC Korea TAEJIN Tech · Voltage Reference · SOT-23

TL431ASF from HTC Korea TAEJIN Tech, in a SOT-23. 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 voltage input; sets the regulated output voltage via external resistor divider; reference input current IREF typ. 1.8 µA, max 4.0 µA (IK = 10 mA, R1 = 10 kΩ, R2 = ∞).
2 A power_in Anode terminal; connected to circuit ground; cathode current range (continuous) −100 mA to 150 mA flows from cathode to anode.
3 K passive Cathode terminal (input supply voltage); regulated cathode-to-anode voltage VKA from VREF (≈ 2.495 V) to 40 V; minimum cathode current for regulation IK(MIN) = 0.5 mA; dynamic impedance ZKA typ. 0.27 Ω (IK = 1 mA-100 mA, f ≤ 1 kHz).

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 (TL431A, 1%) VREF 2.47 2.495 2.52 V VKA = VREF, IK = 10mA 4
Reference Input Current IREF 1.8 4 uA IKA=10mA, R1=10kΩ, R2=∞ 4
Deviation of Reference Input Current over full range ΔIREF/ΔT 0.4 1.2 uA IK =10mA, R1=10kΩ, R2=∞, TA =Full Range 4
Deviation of Reference Input Voltage over full range ΔVREF/ΔT 8 20 mV VKA = VREF, IK =10mA, TA =Full Range 4
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (ΔVKA=10V) ΔVREF/ΔVKA -1.4 -2.7 mV/V IK =10mA, ΔVKA=10V 4
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (ΔVKA=36V-10V) ΔVREF/ΔVKA -1 -2 mV/V IK =10mA, ΔVKA=36V-10V 4
Minimum Cathode Current for Regulation IK(MIN) 0.5 mA VKA= VREF 4
Off-State Cathode Current IK(OFF) 0.17 0.9 uA 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) IK 0.5 100 mA 2
Cathode Voltage (absolute maximum) VKA 42 V 1
Cathode Current Range (Continuous) IK -100 150 mA 1
Reference Input Current Range IREF -0.05 10 mA 1
Junction Temperature Range TJ -40 150 ℃ 1
Operating Temperature Range TOPR -40 125 ℃ 1
Storage Temperature Range TSTG -65 150 ℃ 1

CAD (KiCad official)

  • Symbol: TL431ASF
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: tl431asf-etched.step / tl431asf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431asf.step / tl431asf.glb are the bare package body.

Provenance

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

  • Datasheet: HTC Korea TAEJIN Tech datasheet (12 pp, sha256 66b4ce853f1e463b, retrieved 2026-09-21, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-4-6 (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