Parts · Transistors

BC550B

2 circuits use this part.

Substitutes Si NPN transistor

Matched on material, polarity and the limits below from the transistor parameter database. Pinouts and packages are not in that data: check the datasheet before you drop one in, and expect gain to change the sound.

This part

Part	hFE min	Vce	Ic	Pc	fT
BC550B	200	45 V	100 mA	0.5 W	150 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
BC546B	200	65 V	100 mA	0.5 W	150 MHz	2
BC547B	200	45 V	100 mA	0.5 W	200 MHz	11
BC107B	200	45 V	100 mA	0.3 W	150 MHz	4
2N6428	200	50 V	200 mA	0.625 W	100 MHz	2
ECG123A	200	40 V	800 mA	0.5 W	300 MHz	1
2SC1815-GR	200	50 V	150 mA	0.4 W	80 MHz	5
2SD1616A	135	60 V	1000 mA	0.75 W	100 MHz	1
BC182	120	50 V	200 mA	0.3 W	150 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2SC945-GR	200	50 V	150 mA	0.4 W	150 MHz
BC847B-AU	200	45 V	100 mA	0.33 W
BC850B-AU	200	45 V	100 mA	0.33 W
BC290	200	40 V	100 mA	0.36 W
BC290A	200	40 V	100 mA	0.36 W
BC290B	200	40 V	100 mA	0.36 W
BC237B	200	45 V	100 mA	0.3 W	150 MHz
BC451B	200	45 V	100 mA	0.3 W	150 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Double Muff BC550B	EHX Double Muff	Fuzz	Fuzz Dog	1590B	2	£26.40	31
	Karma Sutra 2N5401 · BC550B	Catalinbread Karma Suture	Fuzz	PCB Guitar Mania	125B	1	€9.90 out	23