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MMST4403

Public Made by Adom

by adom

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

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MMST4403

MSKSEMI · Bipolar (BJT) · SOT-323

MMST4403 from MSKSEMI, 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 BASE input Base terminal of the transistor; the datasheet gives no pin-specific limit, and the device is rated for VEBO -5 V and IC -600 mA absolute maximum.
2 EMITTER passive Emitter terminal of the transistor; the datasheet gives no pin-specific limit, and the device is rated for VCBO -40 V and VCEO -40 V.
3 COLLECTOR passive Collector terminal of the transistor; the datasheet gives no pin-specific limit, and the device is rated for PC 200 mW and IC -600 mA absolute maximum.

Key specifications

Parameter Value
Manufacturer MSKSEMI
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-emitter breakdown voltage V(BR)CEO -40 V IC=-1mA, IB=0 2
Collector-base breakdown voltage V(BR)CBO -40 V IC=-100µA, IE=0 2
Emitter-base breakdown voltage V(BR)EBO -5 V IE=-100µA, IC=0 2
Collector cut-off current ICBO -100 nA VCB=-35V, IE=0 2
DC current gain hFE 30 VCE=-1V, IC=-100µA 2
DC current gain hFE 60 VCE=-1V, IC=-1mA 2
DC current gain hFE 100 VCE=-1V, IC=-10mA 2
DC current gain hFE 100 300 VCE=-2V, IC=-150mA 2
DC current gain hFE 20 VCE=-2V, IC=-500mA 2
Collector-emitter saturation voltage VCE(sat) -0.4 V IC=-150mA, IB=-15mA 2
Collector-emitter saturation voltage VCE(sat) -0.75 V IC=-500mA, IB=-50mA 2
Base-emitter saturation voltage VBE(sat) -0.75 -0.95 V IC=-150mA, IB=-15mA 2
Base-emitter saturation voltage VBE(sat) -1.3 V IC=-500mA, IB=-50mA 2
Transition frequency fT 200 MHz VCE=-10V, IC=-20mA, f=100MHz 2
Collector output capacitance Cob 8.5 pF VCB=-10V, IE=0, f=1MHz 2
Collector-emitter voltage VCEO -40 V 2
Collector-base voltage VCBO -40 V 2
Emitter-base voltage VEBO -5 V 2
Collector current IC -600 mA 2
Collector power dissipation PC 200 mW 2
Operation junction and storage temperature range TJ,Tstg -55 150 ℃ 2
Thermal resistance from junction to ambient RΘJA 625 ℃/W 2

CAD (KiCad official)

  • Symbol: MMST4403
  • Footprint: Package_TO_SOT_SMD:SOT-323_SC-70
  • 3D model: SOT-323 (KiCad packages3D, STEP)
  • 3D model files: mmst4403-etched.step / mmst4403-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmst4403.step / mmst4403.glb are the bare package body.

Provenance

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

  • Datasheet: MSKSEMI datasheet (5 pp, sha256 cbfe73a69b85ca21, 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