component

MPSA42SI

Public Made by Adom

by adom

YFW Bipolar (BJT), SOT-89. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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MPSA42SI

YFW · Bipolar (BJT) · SOT-89

MPSA42SI from YFW, in a SOT-89. 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 NPN transistor, with emitter-base voltage rated at VEBO 5 V maximum and emitter-base breakdown V(BR)EBO of 5 V minimum.
2 Collector passive Collector terminal of the NPN transistor, rated at VCBO 300 V and VCEO 300 V with collector current IC 0.3 A continuous.
3 Emitter passive Emitter terminal of the NPN transistor, the reference for the VCEO 300 V and VEBO 5 V ratings.

Key specifications

Parameter Value
Manufacturer YFW
Package SOT-89
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 300 V 1
Collector-Emitter Voltage VCEO 300 V 1
Emitter-Base Voltage VEBO 5 V 1
Collector Current - Continuous IC 0.3 A 1
Collector Power dissipation PC 0.35 W 1
Thermal Resistance, junction to Ambient RθJA 357 °C/mW 1
Junction Temperature TJ 150 °C 1
Storage Temperature TSTG -55 150 °C 1
Collector-base breakdown voltage V(BR)CBO 300 V IC= 100μA, IE=0 1
Collector-emitter breakdown voltage V(BR)CEO 300 V IC= 1mA, IB=0 1
Emitter-base breakdown voltage V(BR)EBO 5 V IE= 100μA, IC=0 1
Collector cut-off current ICBO 0.25 μA VCB=200V, IE=0 1
Emitter cut-off current IEBO 0.1 μA VEB= 5V, IC=0 1
DC current gain hFE(1) hFE(1) 60 VCE= 10V, IC= 1mA 1
DC current gain hFE(2) hFE(2) 100 200 VCE= 10V, IC= 10mA 1
DC current gain hFE(3) hFE(3) 60 VCE= 10V, IC= 10mA 1
Collector-emitter saturation voltage VCE(sat) 0.2 V IC=20mA, IB= 2mA 1
Base-emitter saturation voltage VBE(sat) 0.9 V IC= 20mA, IB=2mA 1
Transition frequency fT 50 MHz VCE= 20V, IC= 10mA, f=30MHz 1

CAD (KiCad official)

  • Symbol: MPSA42SI
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)
  • 3D model files: mpsa42si-etched.step / mpsa42si-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mpsa42si.step / mpsa42si.glb are the bare package body.

Provenance

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

  • Datasheet: YFW datasheet (4 pp, sha256 47e504a3a44ed616, 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