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TL431CSF

Public Made by Adom

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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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TL431CSF

HTC Korea TAEJIN Tech · Voltage Reference · SOT-23

TL431CSF 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 Reference input Reference voltage input that sets the cathode regulation point (VREF about 2.495 V; TL431C 2.483 to 2.507 V at IK = 10 mA) and must be driven through the external divider resistors.
2 Anode power_in Ground (common) terminal of the shunt regulator, through which the cathode current returns; recommended cathode current IK is 0.5 mA to 100 mA.
3 Cathode power_in Cathode (regulated output) terminal, specified as Input Supply Voltage in the datasheet, with recommended operating voltage VREF to 40 V, absolute maximum cathode voltage 42 V, and continuous cathode current -100 to 150 mA.

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 (TL431C, 0.5%) VREF 2.483 2.495 2.507 V VKA =VREF, IK =10mA 4
Deviation of Reference Input Voltage (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-VREF) ΔVREF/ΔVKA -1.4 -2.7 mV/V IK =10mA, ΔVKA=10V -VREF 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
Reference Input Current IREF 1.8 4 uA IKA=10mA, R1=10kΩ, R2=∞ 4
Deviation of Reference Input Current (full range) ΔIREF/ΔT 0.4 1.2 uA 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 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 Minimum is VREF (not a numeric limit) 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 Continuous 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: TL431CSF
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: tl431csf-etched.step / tl431csf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431csf.step / tl431csf.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 0a0d5fc0a3221190, 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