Parts · Transistors

BC559

Si PNP BJT TO-92 TH.4 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
BC559	125	25 V	200 mA	0.3 W	75 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
BC309	125	20 V	100 mA	0.3 W	100 MHz	3
BC557A	125	45 V	100 mA	0.5 W	75 MHz	2
2SA1015Y	120	50 V	150 mA	0.4 W	80 MHz	4
BC187	100	25 V	100 mA	0.3 W	50 MHz	1
2N4126	120	25 V	200 mA	0.31 W	250 MHz	5
2N4288	100	25 V	100 mA	0.25 W	40 MHz	2
MPS6519	150	25 V	100 mA	0.31 W	200 MHz	1
TIS93	100	40 V	400 mA	0.625 W		4

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BC418A	125	25 V	100 mA	0.25 W	75 MHz
BC275A	125	25 V	100 mA	0.3 W	65 MHz
BC252	125	20 V	100 mA	0.3 W	80 MHz
BC253	125	20 V	100 mA	0.3 W	80 MHz
BC252A	120	25 V	100 mA	0.3 W	80 MHz
BC253A	120	25 V	100 mA	0.3 W	80 MHz
BC262	125	25 V	100 mA	0.3 W	100 MHz
BC262A	125	25 V	100 mA	0.3 W	100 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
CultureJam Stein Fuzz Perfboard Unverified BC559 CultureJam Stein Fuzz · 1590A	CultureJam Stein Fuzz	Fuzz	Effects Layouts (blog)	1590A	2	—	15
Serge ring modulator BC559 · CA3080 · CA3080A · TL071	—	Ring Mod / Synth	Experimentalists Anonymous	—	2	—	22
Transistor headphone amplifier BC549 · BC559	—	Other	Experimentalists Anonymous	—	—	—	14
Roger Mayer Stone Fuzz Vero12×9 Verified BC559 Roger Mayer Stone Fuzz	Roger Mayer Stone Fuzz	Fuzz	Tagboard Effects	—	2	—	12