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MPSA55

Public Made by Adom

by adom

Changjing Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MPSA55

Changjing · Bipolar (BJT) · TO-92

MPSA55 from Changjing, in a TO-92. 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 EMITTER passive Emitter terminal of the PNP transistor; the emitter-base breakdown voltage V(BR)EBO is -4 V minimum and the emitter cut-off current IEBO is limited to -0.1 µA at VEB = -4 V.
2 BASE passive Base terminal of the PNP transistor; the base-emitter on voltage VBE is -1.2 V maximum at IC = -100 mA and VCE = -1 V.
3 COLLECTOR passive Collector terminal of the PNP transistor; rated for -0.5 A continuous collector current and -60 V collector-base and collector-emitter breakdown voltage (V(BR)CBO and V(BR)CEO).

Key specifications

Parameter Value
Manufacturer Changjing
Package TO-92
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 -60 V 1
Emitter-base voltage -4 V 1
Collector current, continuous -0.5 A 1
Collector power dissipation 625 mW 1
Operation junction and storage temperature range TJ, Tstg -55 °C 1
Thermal resistance from junction to ambient 200 °C/W 1
Collector-base breakdown voltage V(BR)CBO -60 V IC= -0.1mA,IE=0 2
Collector-emitter breakdown voltage V(BR)CEO -60 V IC=-1mA,IB=0 2
Emitter-base breakdown voltage V(BR)EBO -4 V IE=-0.1mA,IC=0 2
Collector cut-off current ICBO -0.1 A VCB=-60V,IE=0 2
Emitter cut-off current IEBO -0.1 A VEB=-4V,IC=0 2
DC current gain hFE(1) 100 VCE=-1V, IC=-10mA 2
Collector-emitter saturation voltage VCE(sat) -0.25 V IC=-100mA,IB=-10mA 2
Base-emitter on voltage VBE -1.2 V IC=-100mA, VCE=-1V 2
Transition frequency fT 50 MHz VCE=-1V,IC=-100mA,f=100MHz 2

CAD (KiCad official)

  • Symbol: MPSA55
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92 (KiCad packages3D, STEP)
  • 3D model files: mpsa55-etched.step / mpsa55-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mpsa55.step / mpsa55.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (5 pp, sha256 356fa2d94b637e0b, 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