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MMBTA42Q

Public Made by Adom

by adom

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

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MMBTA42Q

Yangzhou Yangjie Elec Tech · Bipolar (BJT) · SOT-23

MMBTA42Q from Yangzhou Yangjie Elec Tech, 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 B input Base of the NPN transistor; the datasheet gives VEBO of 5 V maximum and a base-emitter saturation voltage of 1.0 V maximum at IC=20 mA, IB=2 mA.
2 E passive Emitter of the NPN transistor; the datasheet gives VEBO of 5 V maximum.
3 C passive Collector of the NPN transistor; the datasheet gives VCBO and VCEO of 300 V maximum and continuous IC of 500 mA maximum.

Key specifications

Parameter Value
Manufacturer Yangzhou Yangjie Elec Tech
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 300 V Ta=25℃ (Maximum Ratings) 1
Collector-Emitter Voltage VCEO 300 V Ta=25℃ (Maximum Ratings) 1
Emitter-Base Voltage VEBO 5 V Ta=25℃ (Maximum Ratings) 1
Collector Current - Continuous IC 500 mA Ta=25℃ (Maximum Ratings) 1
Total Device Dissipation PD 350 mW Ta=25℃ (Maximum Ratings) 1
Junction Temperature Tj -55 150 ℃ 1
Storage Temperature TSTG -55 150 ℃ 1
Collector-base breakdown voltage VCBO 300 V IC= 100uA, IE=0 2
Collector-emitter breakdown voltage VCEO 300 V IC= 1mA, IB=0 2
Emitter-base breakdown voltage VEBO 5 V IE= 100uA, IC=0 2
Collector-base cut-off current ICBO 0.5 uA VCB=200V, IE =0 2
Emitter-base cut-off current IEBO 0.5 uA VEB=5 V, IC=0 2
DC current gain hFE 25 VCE= 10V, IC= 1mA 2
DC current gain hFE 40 300 VCE= 10V, IC= 10mA 2
DC current gain hFE 40 VCE=10V, IC=30mA 2
Collector-emitter saturation voltage VCE(sat) 0.5 V IC=20mA, IB= 2mA 2
Base-emitter saturation voltage VBE(sat) 1 V IC=20mA, IB= 2mA 2
Transition frequency fT 50 MHz VCE=20V,IC=10mA,f=30MHz 2

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 1

CAD (KiCad official)

  • Symbol: MMBTA42Q
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: mmbta42q-etched.step / mmbta42q-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmbta42q.step / mmbta42q.glb are the bare package body.

Provenance

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

  • Datasheet: Yangzhou Yangjie Elec Tech datasheet (5 pp, sha256 8c4d9c5a6299d74b, retrieved 2026-10-17, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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