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TL431-1%

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

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TL431-1%

FOSAN · Voltage Reference · SOT-23

TL431-1% from FOSAN, 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 REF input Reference input (R) of the adjustable shunt regulator; reference voltage 2.495V typ at VKA=VREF, IKA=10mA, input current IREF within -0.05 to +10mA absolute maximum.
2 K passive Cathode (K) of the shunt regulator; VKA up to 40V absolute maximum, cathode current -100 to +150mA, sink capability 1 to 100mA, programmable output to 36V.
3 A passive Anode (A), the regulator's ground-return terminal, normally connected to the lowest circuit potential.

Key specifications

Parameter Value
Manufacturer FOSAN
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 (1% grade) VREF 2.47 2.495 2.52 V VKA=VREF, IKA=10mA, Ta=25℃ 2
Deviation of Reference Input Voltage over temperature ΔVREF/ΔT 3 17 mV VKA=VREF, IKA=10mA, -20 to +85℃ 2
Ratio of change in reference input voltage to cathode voltage ΔVREF/ΔVKA 2 2.7 mV/V IKA=10mA, VKA=10V to 36V 2
Deviation of Reference Input Current over full temperature range ΔIREF/ΔT 0.4 1.2 µA IKA=10mA, R1=10kΩ, R2=∞, Ta=-20 to +85℃ 2
Minimum cathode current for regulation IKA(MIN) 0.25 0.5 mA VKA=VREF 2
Cathode to anode voltage VKA 40 V 1
Cathode current range IK -100 150 mA 1
Reference input current range IREF -0.05 10 mA 1
Power dissipation PD 200 mW 1
Solder temperature / time Td 260 ℃ 10 s (printed as 260/10 ℃/S) 1
Junction and storage temperature TJ,Tstg -40 125 ℃ 1
Operating ambient temperature Top -25 85 ℃ 1
Thermal resistance junction-ambient RΘJA 625 ℃/W junction to ambient 1

CAD (KiCad official)

  • Symbol: TL431-1%
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: tl431-1-etched.step / tl431-1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431-1.step / tl431-1.glb are the bare package body.

Provenance

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

  • Datasheet: FOSAN datasheet (4 pp, sha256 9becadd63f85cda8, retrieved 2026-10-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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