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Generated by kicad-footprint-generator · KiCad file format 20260206

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mmst4401-etched.step	mmst4401: factory component page (tier=lcsc) · Ray	7d ago
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MMST4401

MSKSEMI · Bipolar (BJT) · SOT-323

MMST4401 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	passive	Base terminal of the NPN transistor; the datasheet gives no pin-specific limit, so use the device maximum ratings (VEBO 6 V, IC 600 mA).
2	EMITTER	passive	Emitter terminal of the NPN transistor; the datasheet gives no pin-specific limit, so use the device maximum ratings (VEBO 6 V, IC 600 mA).
3	COLLECTOR	passive	Collector terminal of the NPN transistor; the datasheet gives no pin-specific limit, so use the device maximum ratings (VCBO 60 V, VCEO 40 V, IC 600 mA).

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-base voltage	VCBO			60	V		2
Collector-emitter voltage	VCEO			40	V		2
Emitter-base voltage	VEBO			6	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, junction to ambient	RΘJA			625	℃/W		2
Collector-base breakdown voltage	V(BR)CBO	60			V	IC=100µA, IE=0	2
Collector-emitter breakdown voltage	V(BR)CEO	40			V	IC=1mA, IB=0	2
Emitter-base breakdown voltage	V(BR)EBO	6			V	IE=100µA, IC=0	2
Collector cut-off current	ICBO			100	nA	VCB=35V, IE=0	2
Collector cut-off current	ICEO			500	nA	VCE=35V, IB=0	2
DC current gain	hFE	20				VCE=1V, IC=100µA	2
DC current gain	hFE	40				VCE=1V, IC=1mA	2
DC current gain	hFE	80				VCE=1V, IC=10mA	2
DC current gain	hFE	100		300		VCE=1V, IC=150mA	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)			1.2	V	IC=500mA, IB=50mA	2
Transition frequency	fT	250			MHz	VCE=10V, IC=20mA, f=100MHz	2
Collector output capacitance	Cob			6.5	pF	VCB=5V, IE=0, f=1MHz	2

CAD (KiCad official)

Symbol: MMST4401
Footprint: Package_TO_SOT_SMD:SOT-323_SC-70
3D model: SOT-323 (KiCad packages3D, STEP)
3D model files: mmst4401-etched.step / mmst4401-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmst4401.step / mmst4401.glb are the bare package body.

Provenance

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

Datasheet: MSKSEMI datasheet (5 pp, sha256 25e3fd936bf4fbac, 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