Parts · Transistors

BC178B

Si PNP BJT TO-18 TH.1 circuit uses this part.

Substitutes Si PNP 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
BC178B	180	25 V	200 mA	0.3 W	100 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
2SA1048GR	200	50 V	150 mA	0.2 W	80 MHz	2
MPS6519	150	25 V	100 mA	0.31 W	200 MHz	1
BC557B	200	45 V	100 mA	0.5 W	75 MHz	6
2SA970	200	120 V	100 mA	0.3 W	100 MHz	5
BC309	125	20 V	100 mA	0.3 W	100 MHz	3
BC559	125	25 V	200 mA	0.3 W	75 MHz	4
2SA1335	200	120 V	100 mA	0.2 W	100 MHz	4
BC559B	240	25 V	100 mA	0.5 W	75 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BC158B	180	25 V	100 mA	0.3 W	100 MHz
BC159B	180	20 V	100 mA	0.3 W	100 MHz
BC258B	180	25 V	100 mA	0.3 W	130 MHz
BCW61B	180	32 V	100 mA	0.25 W	100 MHz
BCW61BLT1	180	32 V	100 mA	0.3 W	125 MHz
BSW22	180	25 V	200 mA	0.3 W	150 MHz
BC321B	200	30 V	150 mA	0.31 W	100 MHz
BC250C	200	20 V	100 mA	0.3 W	100 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	High Quality Transistor Preamp BC108B · BC109C · BC178B	—	Preamp / Amp-in-a-box	Experimentalists Anonymous	—	1	—	19