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2N4401

Changjing · Bipolar (BJT) · TO-92

2N4401 from Changjing, 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 lead of the 2N4401 NPN transistor, rated for VEBO 6 V and IC continuous 600 mA maximum.
2	BASE	passive	Base lead of the 2N4401 NPN transistor; saturation is specified at IB=15 mA for IC=150 mA and IB=50 mA for IC=500 mA.
3	COLLECTOR	passive	Collector lead of the 2N4401 NPN transistor, rated for VCBO 60 V, VCEO 40 V, and IC continuous 600 mA maximum.

Key specifications

Parameter	Value
Manufacturer	Changjing
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	Max	Unit	Conditions	Page
Collector-base breakdown voltage	V(BR)CBO	60		V	IC=100μA, IE=0	1
Collector-emitter breakdown voltage	V(BR)CEO	40		V	IC=1mA, IB=0	1
Emitter-base breakdown voltage	V(BR)EBO	6		V	IE=100μA, IC=0	1
Collector cut-off current	ICBO		0.1	μA	VCB=35V, IE=0	1
Emitter cut-off current	IEBO		0.1	μA	VEB=5V, IC=0	1
DC current gain	hFE(1)	20			VCE=1V, IC=0.1mA	1
DC current gain	hFE(2)	40			VCE=1V, IC=1mA	1
DC current gain	hFE(3)	80			VCE=1V, IC=10mA	1
DC current gain	hFE(4)	100	300		VCE=1V, IC=150mA	1
Collector-emitter saturation voltage	VCE(sat)1		0.4	V	IC=150 mA, IB=15mA	1
Collector-emitter saturation voltage	VCE(sat)2		0.75	V	IC=500 mA, IB=50mA	1
Base-emitter saturation voltage	VBE(sat)1		0.95	V	IC=150 mA, IB=15mA	1
Base-emitter saturation voltage	VBE(sat)2		1.2	V	IC=500 mA, IB=50mA	1
Transition frequency	fT	250		MHz	VCE=10V, IC=20mA, f=100MHz	1
Output Capacitance	Cob		6.5	pF	VCB=10V, IE=0, f=100KHz	1
Delay time	td		15	nS		1
Rise time	tr		20	nS	VCC=30V, VBE(OFF)=2V, IC=150mA, IB1=15mA	1
Storage time	tS		225	nS		1
Fall time	tf		30	nS	VCC=30V, IC=150mA, IB1=-IB2=15mA	1
Collector-Base Voltage	VCBO		60	V		1
Collector-Emitter Voltage	VCEO		40	V		1
Emitter-Base Voltage	VEBO		6	V		1
Collector Current -Continuous	IC		600	mA		1
Collector Power dissipation	PC		0.625	W		1
Junction Temperature	TJ		150	℃		1
Storage Temperature	Tstg	-55	150	℃		1
Thermal Resistance, junction to Ambient	RӨJA		357	℃/mW		1

CAD (KiCad official)

Symbol: 2N4401
Footprint: Package_TO_SOT_THT:TO-92_Inline
3D model: TO-92 (KiCad packages3D, STEP)
3D model files: 2n4401-etched.step / 2n4401-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 2n4401.step / 2n4401.glb are the bare package body.

Provenance

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

Datasheet: Changjing datasheet (2 pp, sha256 9efe577da20e67ad, retrieved 2026-10-19, 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