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Contents

Pinout
Key specifications
Electrical characteristics
Materials and finish
CAD (KiCad official)
Provenance

README

markdown

2N5551-B

Foshan Blue Rocket Elec · Bipolar (BJT) · TO-92

2N5551-B from Foshan Blue Rocket Elec, 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	Collector	passive	Collector terminal of the NPN transistor; the datasheet rates VCBO at 180 V, VCEO at 160 V, and continuous IC at 600 mA.
2	Base	passive	Base terminal of the NPN transistor; the datasheet rates continuous base current IB at 300 mA and emitter-to-base voltage VEBO at 6.0 V.
3	Emitter	passive	Emitter terminal of the NPN transistor, the reference for the VEBO 6.0 V emitter-to-base rating.

Key specifications

Parameter	Value
Manufacturer	Foshan Blue Rocket Elec
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	Typ	Max	Unit	Conditions	Page
Collector to Base Voltage	VCBO			180	V		2
Collector to Emitter Voltage	VCEO			160	V		2
Emitter to Base Voltage	VEBO			6	V		2
Collector Current - Continuous	IC			600	mA		2
Base Current - Continuous	IB			300	mA		2
Collector Power Dissipation	PC			625	mW		2
Junction Temperature	Tj			150	℃		2
Storage Temperature Range	Tstg	-55		150	℃		2
DC Current Gain	hFE(1)	50	200	400		VCE=5.0V IC=10mA	2
DC Current Gain	hFE(2)	20	160			VCE=5.0V IC=50mA	2
DC Current Gain	hFE(3)	40	190			VCE=5.0V IC=1.0mA	2
Collector to Emitter Saturation Voltage	VCE(sat) (1)		0.06	0.15	V	IC=10mA IB=1.0mA	2
Collector to Emitter Saturation Voltage	VCE(sat) (2)		0.09	0.3	V	IC=50mA IB=5.0mA	2
Base to Emitter Saturation Voltage	VBE(sat) (1)		0.7	1	V	IC=10mA IB=1.0mA	2
Base to Emitter Saturation Voltage	VBE(sat) (2)		0.8	1	V	IC=50mA IB=5.0mA	2
Base to Emitter Voltage	VBE		0.68	0.75	V	VCE=5.0V IC=10mA	2
Collector Cut-Off Current	ICBO			0.1	μA	VCB=180V IE=0	2
Emitter Cut-Off Current	IEBO			0.1	μA	VEB=6.0V IC=0	2
Current Gain Bandwidth Product	fT	50	110		MHz	VCE=10V IC=10mA	2
Output Capacitance	Cob		2.2	5	pF	VCB=10V IE=0 f=1.0MHz	2
Turn On Time	ton			0.3	μs	IC=100mA IB1=-IB2=10mA	2
Turn Off Time	toff			0.4	μs	IC=100mA IB1=-IB2=10mA	2
Storage Time	tstg			0.2	μs	IC=100mA IB1=-IB2=10mA	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
housing	PC		Base Current - Continuous IB 300 mA Collector Power Dissipation PC 625 mW	2

CAD (KiCad official)

Symbol: 2N5551-B
Footprint: Package_TO_SOT_THT:TO-92_Inline
3D model: TO-92 (KiCad packages3D, STEP)
3D model files: 2n5551-b-etched.step / 2n5551-b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 2n5551-b.step / 2n5551-b.glb are the bare package body.

Provenance

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

Datasheet: Foshan Blue Rocket Elec datasheet (6 pp, sha256 0bd23f9c6e012db1, 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