component

TL431ASQ

Public Made by Adom

by adom

PJSEMI Voltage References, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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TL431ASQ

PJSEMI · Voltage References · SOT-89-3

TL431ASQ from PJSEMI, 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 input pin that sets the cathode output voltage, with reference input current limited to -0.05 to +10 mA in absolute maximum ratings.
2 Anode passive Anode terminal, the common return for the cathode current, which ranges from -100 to +150 mA continuous per the absolute maximum ratings.
3 Cathode passive Cathode terminal, rated up to 37 V absolute maximum with a recommended cathode current of 1 to 100 mA for regulation.

Key specifications

Parameter Value
Manufacturer PJSEMI
Package SOT-89-3
Category Power Management ICs
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 (TL431ASQ) VREF 2.48 2.495 2.51 V VKA=VREF, IKA=10mA 2
Deviation of Reference Input Voltage Over Temperature ∆VREF 4.5 17 mV VKA=VREF,IKA=10mA,-40°C ≤TA≤+85°C 2
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (VKA=10V~VREF) ∆VREF/∆VKA -1 -2.7 mV/V IKA=10mA, VKA=10V~VREF 2
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (VKA=36V~10V) ∆VREF/∆VKA -0.5 -2 mV/V IKA=10mA, VKA=36V~10V 2
Reference Input Current IREF 1.5 4 µA IKA=10mA, R1=10kΩ, R2=∞ 2
Deviation of Reference Input Current Over Full Temperature Range ∆IREF 0.4 1.2 µA IKA=10mA, R1=10kΩ, R2=∞, -25°C ≤TA≤+85°C 2
Minimum Cathode Current for Regulation IKA(MIN) 0.45 1 mA VKA=VREF 2
Off-State Cathode Current IKA(OFF) 0.05 1 µA VKA=36V, VREF=0 2
Dynamic Impedance ZKA 0.15 0.5 Ω VKA=VREF, IKA=1~ 100mA,f≤1.0kHz 2
Cathode Voltage (recommended) VKA 36 V 1
Cathode Current (recommended) IKA 1 100 mA 1
Cathode Voltage (absolute maximum) VKA 37 V 1
Cathode Current Range (Continuous) IKA -100 150 mA 1
Reference Input Current Range IREF -0.05 10 mA 1
Power Dissipation PD 770 mW 1
Operating Junction Temperature TJ 150 °C 1
Operating Ambient Temperature TOPR -40 85 °C 1
Storage Temperature TSTG -65 150 °C 1

CAD (KiCad official)

  • Symbol: TL431ASQ
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: tl431asq-etched.step / tl431asq-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431asq.step / tl431asq.glb are the bare package body.

Provenance

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

  • Datasheet: PJSEMI datasheet (4 pp, sha256 0f0a6fd2add7a032, retrieved 2026-10-27, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus off (skipped (clean text read)), 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