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MMSTA42Q

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Yangzhou Yangjie Elec Tech Bipolar (BJT), SOT-323. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componenttransistors-thyristorsmmsta42qfactory-2.0.0extractor-text

Verified MMSTA42Q

by Ray · last 4 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

4 Nov 2026RayPublished by the parts factory: tier lcsc, 3 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: MMSTA42Q · SOT-323 · 3 pins
  • ✓copper: 3 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 6-page datasheet
  • •distributor (warn): no ['digikey', 'mouser'] number
  • ✓family: SOT-323_SC-70
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-e3wo39sh/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 3 pins = 3 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 3 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ mmsta42q.kicad_sym✓ mmsta42q.kicad_mod✓ mmsta42q.step
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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

markdown

MMSTA42Q

Yangzhou Yangjie Elec Tech · Bipolar (BJT) · SOT-323

MMSTA42Q from Yangzhou Yangjie Elec Tech, in a SOT-323. 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; emitter-base voltage limited to 5 V (VEBO) and IEBO max 0.5 uA at VEB=5 V.
2 E passive Emitter of the NPN transistor; the 100 mA collector current (IC max) returns through this pin.
3 C passive Collector of the NPN transistor; VCEO and VCBO are 300 V max and IC is 100 mA max.

Key specifications

Parameter Value
Manufacturer Yangzhou Yangjie Elec Tech
Package SOT-323
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 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=5V , 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
Collector-base voltage VCBO 300 V 1
Collector-emitter voltage VCEO 300 V 1
Emitter-base voltage VEBO 5 V 1
Collector current IC 100 mA 1
Collector power dissipation Pc 200 mW Device mounted on FR-4 PCB 1.0 x 1.0 x 0.06 inch 1
Operation junction temperature Tj -55 150 ℃ 1
Storage temperature Tstg -55 150 ℃ 1
Thermal resistance junction to ambient RthJA 625 K/W Device mounted on FR-4 PCB 1.0 x 1.0 x 0.06 inch 1

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
housing black 4. Body color: Black 5
contacts tin ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 1

CAD (KiCad official)

  • Symbol: MMSTA42Q
  • Footprint: Package_TO_SOT_SMD:SOT-323_SC-70
  • 3D model: SOT-323 (KiCad packages3D, STEP)
  • 3D model files: mmsta42q-etched.step / mmsta42q-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsta42q.step / mmsta42q.glb are the bare package body.

Provenance

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

  • Datasheet: Yangzhou Yangjie Elec Tech datasheet (6 pp, sha256 9a1d96f34a04ab4c, retrieved 2026-11-04, 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