Parts · Transistors

BC558

Si PNP BJT TO-92 TH.2 circuits use this part.

Datasheet · from onsemi.com

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
BC558	75	25 V	100 mA	0.5 W	75 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
BC557	75	45 V	200 mA	0.3 W	75 MHz	20
2SA1015	70	50 V	150 mA	0.4 W	80 MHz	8
BC307	75	45 V	100 mA	0.3 W	100 MHz	1
BC179	70	20 V	50 mA	0.3 W	100 MHz	1
BC556	75	65 V	100 mA	0.5 W	150 MHz	1
BC327	63	45 V	800 mA	0.5 W	60 MHz	3
2N3702	60	25 V	200 mA	0.36 W	100 MHz	5
BC177	70	45 V	100 mA	0.3 W	130 MHz	2

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BFW31	70	30 V	700 mA	0.5 W
KSA642	70	25 V	300 mA	0.4 W
BC298	75	25 V	1000 mA	0.375 W	100 MHz
BC418	75	25 V	100 mA	0.25 W	75 MHz
PN750	75	40 V	2000 mA	0.625 W	75 MHz
MPSA66	75	30 V	300 mA	0.625 W	100 MHz
2SA509	70	30 V	500 mA	0.6 W	70 MHz
2SA509O	70	30 V	500 mA	0.6 W	70 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Dunlop Band of Gypsys Fuzz Face Perfboard Verified BC558 · MPSA18 Dallas Arbiter Fuzz Face	Dallas Arbiter Fuzz Face	Fuzz	Effects Layouts (blog)	—	2	—	27
	Fillmore Fuzz BC558 · MPSA18 Dallas Arbiter Fuzz Face · 1590B	Dallas Arbiter Fuzz Face	Fuzz	Fuzz Dog	1590B	2	£30.00	33