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MPSA42

Public Made by Adom

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

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MPSA42

ST Semtech · Bipolar (BJT) · TO-92

MPSA42 from ST Semtech, 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 NPN transistor; the datasheet gives VEBO 6 V maximum and a minimum emitter-base breakdown voltage of 6 V at IE = 100 µA.
2 Base input Base terminal of the NPN transistor; the datasheet gives VEBO 6 V maximum and VBE(sat) of 0.9 V maximum at IC = 20 mA, IB = 2 mA.
3 Collector passive Collector terminal of the NPN transistor; the datasheet gives VCEO of 300 V (MPSA42) or 200 V (MPSA43), IC of 500 mA and Ptot of 625 mW.

Key specifications

Parameter Value
Manufacturer ST Semtech
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
DC Current Gain (at VCE = 10 V, IC = 1 mA) hFE 25 VCE = 10 V, IC = 1 mA 1
DC Current Gain (at VCE = 10 V, IC = 10 mA) hFE 40 VCE = 10 V, IC = 10 mA 1
DC Current Gain (at VCE = 10 V, IC = 30 mA) hFE 40 VCE = 10 V, IC = 30 mA 1
Collector Base Cutoff Current (MPSA42) ICBO 0.1 µA VCB = 200 V 1
Emitter Base Cutoff Current (MPSA42) IEBO 0.1 µA VEB = 6 V 1
Collector Base Breakdown Voltage (MPSA42) V(BR)CBO 300 V IC = 100 µA 1
Collector Emitter Breakdown Voltage (MPSA42) V(BR)CEO 300 V IC = 1 mA 1
Emitter Base Breakdown Voltage V(BR)EBO 6 V IE = 100 µA 1
Collector Emitter Saturation Voltage VCE(sat) 0.5 V IC = 20 mA, IB = 2 mA 1
Base Emitter Saturation Voltage VBE(sat) 0.9 V IC = 20 mA, IB = 2 mA 1
Gain Bandwidth Product fT 50 MHz IC = 10 mA, VCE = 20 V, f = 100 MHz 1
Collector Output Capacitance (MPSA42) Cob 3 pF VCB = 20 V, f = 1 MHz 1
Collector Base Voltage (MPSA42) VCBO 300 V Ta = 25 °C 1
Collector Emitter Voltage (MPSA42) VCEO 300 V Ta = 25 °C 1
Emitter Base Voltage VEBO 6 V Ta = 25 °C 1
Collector Current IC 500 mA Ta = 25 °C 1
Power Dissipation Ptot 625 mW Ta = 25 °C 1
Junction Temperature Tj 150 °C 1
Storage Temperature Range Tstg -55 150 °C 1

CAD (KiCad official)

  • Symbol: MPSA42
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92 (KiCad packages3D, STEP)
  • 3D model files: mpsa42-etched.step / mpsa42-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mpsa42.step / mpsa42.glb are the bare package body.

Provenance

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

  • Datasheet: ST Semtech datasheet (2 pp, sha256 61ee4a17f6d8d818, retrieved 2026-10-17, 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