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TL431ATA

Public Made by Adom

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HTC Korea TAEJIN Tech Voltage Reference, TO-92-2.54mm. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TL431ATA

HTC Korea TAEJIN Tech · Voltage Reference · TO-92-2.54mm

TL431ATA from HTC Korea TAEJIN Tech, in a TO-92-2.54mm. 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 passive Reference voltage input (VREF, approx. 2.5 V, 2.495 V typical for the TL431A) that the internal error amplifier regulates against.
2 Anode power_in Listed as Ground in the pin description table; it is the common return of the shunt regulator.
3 Cathode input Cathode is the regulated output and is listed as Input Supply Voltage; recommended VKA is VREF to 40 V with cathode current IK of 0.5 to 100 mA (absolute maximum VKA 42 V).

Key specifications

Parameter Value
Manufacturer HTC Korea TAEJIN Tech
Package TO-92-2.54mm
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 (TA = 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 (TA = 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 Printed minimum is 'VREF' (symbolic, no numeric value) 2
Cathode Current (recommended) IK 0.5 100 mA 2
Cathode Voltage (absolute maximum) VKA 42 V Operating temperature range applies unless otherwise specified 1
Cathode Current Range (Continuous) IK -100 150 mA Operating temperature range applies unless otherwise specified 1
Reference Input Current Range IREF -0.05 10 mA Operating temperature range applies unless otherwise specified 1
Junction Temperature Range TJ -40 150 ℃ Operating temperature range applies unless otherwise specified 1
Operating Temperature Range TOPR -40 125 ℃ Operating temperature range applies unless otherwise specified 1
Storage Temperature Range TSTG -65 150 ℃ 1
Equivalent Full Range Temperature Coefficient 50 ppm/℃ Stated in Features; no test conditions printed 1

CAD (KiCad official)

  • Symbol: TL431ATA
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92-2.54mm (KiCad packages3D, STEP)
  • 3D model files: tl431ata-etched.step / tl431ata-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431ata.step / tl431ata.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 2026-10-18, 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