component

FCX491TA

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by Ray

Diodes Incorporated Bipolar (BJT), SOT-89. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

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FCX491TA

Diodes Incorporated · Bipolar (BJT) · SOT-89

FCX491TA from Diodes Incorporated, in a SOT-89. 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 B input Base terminal of the NPN transistor. Drive current into the base to turn the device on; VBE(on) ≈ 0.83 V typ, VBE(sat) ≈ 0.965 V typ at IC = 1 A, IB = 100 mA. Emitter-base breakdown VEBO = 7 V min.
2 C passive Collector terminal of the NPN transistor; also bonded to the SOT89 exposed back-side heat-slug tab. Rated VCEO = 60 V, VCBO = 80 V, IC = 1 A continuous / ICM = 2 A peak. Tab acts as the primary thermal path (RθJL = 22 °C/W).
3 E passive Emitter terminal of the NPN transistor. Reference terminal for VBE and VCE; VCE(sat) ≈ 160 mV typ at IC = 1 A, IB = 100 mA.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-89
Category Transistors/Thyristors
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • FCX491TA
  • FCX491TAQTA

CAD (KiCad official)

  • Symbol: FCX491TA
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (7 pp, sha256 52c218b9396374d4, retrieved 2026-08-17, tier: lcsc)
  • 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