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KST8550D

Public Made by Adom

by adom

KEXIN Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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KST8550D

KEXIN · Bipolar (BJT) · SOT-23

KST8550D from KEXIN, in a SOT-23. 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 Base input Base terminal of the PNP transistor; the datasheet rates the emitter-base voltage VEBO at -5 V and the device for collector current IC = -1.5 A.
2 Emitter passive Emitter terminal of the PNP transistor; the emitter-base breakdown voltage VEBO is rated at -5 V maximum.
3 Collector passive Collector terminal of the PNP transistor; the datasheet rates the collector-base voltage VCBO at -40 V and the collector-emitter voltage VCEO at -25 V.

Key specifications

Parameter Value
Manufacturer KEXIN
Package SOT-23
Category Transistors/Thyristors
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
Collector-base voltage VCBO -40 V 1
Collector-emitter voltage VCEO -25 V 1
Emitter-base voltage VEBO -5 V 1
Collector current IC -1.5 A 1
Collector power dissipation PC 0.3 W 1
Junction temperature Tj 150 °C 1
Storage temperature Tstg -55 150 °C 1
Collector-base breakdown voltage VCBO -40 V IC=-100 A, IE=0 1
Collector-emitter breakdown voltage VCEO -25 V IC=-1mA, IB=0 1
Emitter-base breakdown voltage VEBO -5 V IE=-100 A, IC=0 1
Collector cut-off current ICBO -1 A VCB=-40V, IE=0 1
Emitter cut-off current IEBO -1 A VEB=-5V, IC=0 1
DC current gain hFE 120 400 VCE=-1V, IC=-100mA 1
DC current gain hFE 40 VCE=-1V, IC=-800mA 1
Collector-emitter saturation voltage VCE(sat) -0.5 V IC=-800mA, IB=-80mA 1
Base-emitter on voltage VBE(on) -1 V VCE=-1V, IC=-10mA 1
Output capacitance Cob 20 pF VCB=-10V, IE=0, f=1MHz 1
Transition frequency fT 100 MHz VCE=-10V, IC=-50mA, f=30MHz 1

CAD (KiCad official)

  • Symbol: KST8550D
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: kst8550d-etched.step / kst8550d-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); kst8550d.step / kst8550d.glb are the bare package body.

Provenance

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

  • Datasheet: KEXIN datasheet (2 pp, sha256 3c116c6d7eb4e315, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-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