component

TL1431IDT

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by Ray

STMicroelectronics Voltage Reference, SO-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Datasheet

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Contents

README

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TL1431IDT

STMicroelectronics · Voltage Reference · SO-8

TL1431IDT from STMicroelectronics, in a SO-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 of the shunt reference. Connect through a bias resistor to the supply; the device sinks 1 to 100 mA to regulate VKA between Vref (~2.5 V) and 36 V.
2 Anode passive Anode of the shunt reference (return / ground-side terminal). Tied to pin 7 (Anode) internally via the batwing lead-frame heatsink.
3 NC unconnected Batwing thermal / no-connect lead. Part of the fused lead-frame used for heat spreading in the SO-8 batwing package; no functional signal.
4 NC unconnected No internal connection.
5 NC unconnected No internal connection.
6 NC unconnected Batwing thermal / no-connect lead. Part of the fused lead-frame used for heat spreading in the SO-8 batwing package; no functional signal.
7 Anode passive Second Anode pin (fused to pin 2 through the internal batwing lead-frame). Provides additional current path and thermal conduction to the PCB.
8 Ref input Reference (feedback) input to the internal error amplifier. The device regulates VKA so that this pin equals the internal Vref (~2.5 V). Iref range -0.05 to +10 mA.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SO-8
Category PMIC
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • TL1431IDTCD
  • TL1431IDTCDT
  • TL1431IDTACD
  • TL1431IDTACDT
  • TL1431IDT
  • TL1431IDTAID
  • TL1431IDTAIDT
  • TL1431IDTIYDT
  • TL1431IDTAIYDT
  • TL1431IDTCZ
  • TL1431IDTCZT
  • TL1431IDTCZ-AP
  • TL1431IDTACZ
  • TL1431IDTACZT
  • TL1431IDTACZ-AP
  • TL1431IDTIZ
  • TL1431IDTIZT
  • TL1431IDTIZ-AP
  • TL1431IDTAIZ
  • TL1431IDTAIZT
  • TL1431IDTAIZ-AP
  • TL1431IDTCL3T
  • TL1431IDTACL3T
  • TL1431IDTCL5T
  • TL1431IDTACL5T
  • TL1431IDTCCT
  • TL1431IDTACCT

CAD (KiCad official)

  • Symbol: TL1431IDT
  • Footprint: Package_SO:TI_SO-PowerPAD-8
  • 3D model: SO-8 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: STMicroelectronics datasheet (27 pp, sha256 b6e98452fdf42eee, retrieved 2026-08-17, tier: manufacturer)
  • 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