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TL431AF

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HTC Korea TAEJIN Tech Voltage Reference, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TL431AF

HTC Korea TAEJIN Tech · Voltage Reference · SOT-89-3

TL431AF from HTC Korea TAEJIN Tech, 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 Reference input Reference voltage input of the shunt regulator, nominally 2.495 V (TL431A tolerance 2.470 to 2.520 V at VKA = VREF, IK = 10 mA), with reference input current IREF of 1.8 uA typical and 4.0 uA maximum.
2 Anode power_in Ground connection of the device, which must carry the cathode current back to the circuit ground, with cathode current held at or above the 0.5 mA minimum for regulation (IK(MIN)).
3 Cathode power_in Cathode is the regulated shunt node, recommended for operation from VREF up to 40 V with cathode current of 0.5 to 100 mA, and the absolute maximum is 42 V and 150 mA continuous.

Key specifications

Parameter Value
Manufacturer HTC Korea TAEJIN Tech
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 Input Voltage (TL431A, 1%) VREF 2.47 2.495 2.52 V VKA =VREF, IK =10mA 4
Deviation of Reference Input Voltage 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 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 (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
Cathode Voltage (recommended; minimum is VREF) VKA 40 V 2
Cathode Current IK 0.5 100 mA 2

CAD (KiCad official)

  • Symbol: TL431AF
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: tl431af-etched.step / tl431af-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431af.step / tl431af.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