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TL431AM

Public Made by Adom

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HGSEMI Voltage Reference, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TL431AM

HGSEMI · Voltage Reference · SOP-8

TL431AM from HGSEMI, in a SOP-8. 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 CATHODE passive Cathode of the shunt regulator; operating cathode voltage from VREF up to 36V (absolute max 36V) and cathode current 0.2 to 100mA.
2 ANODE passive Anode of the shunt regulator, normally connected to ground; internally tied to the other ANODE pins.
3 ANODE passive Anode of the shunt regulator, normally connected to ground; internally tied to the other ANODE pins.
4 NC unconnected No connection.
5 NC unconnected No connection.
6 ANODE passive Anode of the shunt regulator, normally connected to ground; internally tied to the other ANODE pins.
7 ANODE passive Anode of the shunt regulator, normally connected to ground; internally tied to the other ANODE pins.
8 REF input Reference input that sets the cathode voltage via the divider, with a 2.470V to 2.520V reference (1.0% TL431A grade) and absolute max reference current of 10mA.

Key specifications

Parameter Value
Manufacturer HGSEMI
Package SOP-8
Category Power Management (PMIC)
Pins 8

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 voltage (TL431A, 1.0%) VREF 2.47 2.495 2.52 V VKA=VREF IKA=10mA 5
Minimum cathode current IKA(Min) 150 400 µA VKA=VREF 5
Dynamic impedance ZKA 0.1 0.5 Ω VKA=VREF IKA=1 to 100mA f≤1.0KHz 5
Off-state cathode current IKA(Off) 0.01 1 µA VKA=36V VREF=0 5
Reference current IREF 0.3 0.6 µA IKA=10mA R1=10KΩ R2=∞ 5
Reference current temperature drift ΔIREF 0.2 0.3 µA IKA=10mA R1=10KΩ R2=∞ TA=-10℃to85℃ 5
Reference voltage temperature drift ΔVREF -5 -20 mV VKA=VREF IKA=10mA -20℃ to 110℃ 5
Line regulation (VKA=10V to VREF) ∆VREF/∆VKA -1.87 mV/V IKA=10mA VKA=10V to VREF 5
Line regulation (VKA=36V to 10V) ∆VREF/∆VKA -1.38 mV/V IKA=10mA VKA=36V to 10V 5
Cathode voltage VKA 36 V 4
Cathode current IKA 0.2 100 mA 4
Operating ambient temperature TA -40 85 ℃ 4
Cathode voltage VKA 36 V 3
Cathode current range IKA -100 150 mA 3
Reference input current range IREF 10 mA 3
Junction temperature TJ 150 ℃ 3
Lead soldering temperature TL 260 ℃ 10s 3
Storage temperature TSTG -65 150 ℃ 3
ESD (human body model) ESD 3500 V Human body model 3
Thermal resistance junction-to-case (SOP-8) θJC 150 ℃/W SOP-8 package 5
Power rating (SOP-8) 770 mW Ta=25℃, SOP-8 package 4

CAD (KiCad official)

  • Symbol: TL431AM
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: tl431am-etched.step / tl431am-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl431am.step / tl431am.glb are the bare package body.

Provenance

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

  • Datasheet: HGSEMI datasheet (13 pp, sha256 4e52f2b24a7cd4f5, retrieved 2026-10-18, 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