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LM431AM

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by Ray

HGSEMI Voltage Reference, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Datasheet

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Contents

README

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LM431AM

HGSEMI · Voltage Reference · SOP-8

LM431AM from HGSEMI, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 CATHODE passive Cathode (K) of the shunt regulator. This is the regulated node; current sinks from CATHODE to ANODE when VREF ≥ 2.5V. Operating range Vref-36V, sink current 0.2-100 mA, dynamic impedance ~0.1-0.5 Ω.
2 ANODE passive Anode (A) of the shunt regulator; return terminal for cathode current. All three ANODE pins (2, 3, 6, 7) are internally connected and should all be tied to the low-side rail for thermal and current handling.
3 ANODE passive Anode (A) of the shunt regulator; internally common with pins 2, 6 and 7. Tie to the same node as the other ANODE pins.
4 NC unconnected No internal connection. Leave floating or tie to ANODE for board layout convenience.
5 NC unconnected No internal connection. Leave floating or tie to ANODE for board layout convenience.
6 ANODE passive Anode (A) of the shunt regulator; internally common with pins 2, 3 and 7.
7 ANODE passive Anode (A) of the shunt regulator; internally common with pins 2, 3 and 6.
8 REF input Reference input (R) to the internal error amplifier. Regulation forces this pin to VREF = 2.500 V (typ) versus ANODE. Input bias current IREF ≈ 0.3 µA typ (0.6 µA max); tie directly to CATHODE for a fixed 2.5V shunt, or drive from an external resistor divider to program a higher output voltage up to 36V.

Key specifications

Parameter Value
Manufacturer HGSEMI
Package SOP-8
Category PMIC
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • LM431AMS8
  • LM431AMM
  • LM431AMN
  • LM431AMP
  • LM431AMZ
  • LM431AMZ-Bulk
  • LM431AMZ-Ammo

CAD (KiCad official)

  • Symbol: LM431AM
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: HGSEMI datasheet (10 pp, sha256 e0a2710bfb867674, retrieved 2026-08-17, 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: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF