Parts · Transistors

BC170

Si NPN BJT.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
BC170	35	20 V	100 mA	0.3 W	60 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
2N3568	40	60 V	200 mA	0.3 W	60 MHz	1
2N697	40	40 V	500 mA	0.6 W	50 MHz	1
2N2396	40	40 V	300 mA	0.45 W	40 MHz	1
BF244	30	30 V	100 mA	0.3 W	170 MHz	3
2SC1175	40	45 V	200 mA	0.3 W	170 MHz	1
2N1613	40	50 V	600 mA	0.8 W	80 MHz	3
2N3397	55	25 V	100 mA	0.2 W	60 MHz	1
BC639	40	80 V	1000 mA	1 W	50 MHz	2

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BFY37	35	20 V	100 mA	0.3 W	60 MHz
BSX76	35	20 V	100 mA	0.3 W	100 MHz
2SC1350	40	20 V	300 mA	0.3 W
2SC2710R	40	20 V	500 mA	0.3 W	60 MHz
2SC1209	35	20 V	500 mA	0.5 W	75 MHz
BF395	35	30 V	50 mA	0.31 W	80 MHz
2N3794	35	20 V	500 mA	0.25 W	100 MHz
BFY39	35	25 V	100 mA	0.3 W	100 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Jon Patton's Mossy Sloth Perfboard Unverified BC170 · BC549C Jon Patton Mossy Sloth	Jon Patton Mossy Sloth	Fuzz	Effects Layouts (blog)	—	3	—	32
	Schaller Tremolo Vero21×12 Verified BC109 · BC170 Schaller Tremolo	Schaller Tremolo	Tremolo	Tagboard Effects	—	2	—	18