Parts · Transistors

BC557B

Si PNP BJT TO-92 TH.6 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
BC557B	200	45 V	100 mA	0.5 W	75 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
2SA970	200	120 V	100 mA	0.3 W	100 MHz	5
BC560B	240	45 V	100 mA	0.5 W	150 MHz	4
2SA798	250	50 V	100 mA	0.4 W	50 MHz	1
BC307B	240	45 V	100 mA	0.3 W	130 MHz	6
2N3965	250	60 V	200 mA	0.36 W	50 MHz	3
2N5087	250	50 V	50 mA	0.31 W	40 MHz	171
2SA1015Y	120	50 V	150 mA	0.4 W	80 MHz	4
TIS93	100	40 V	400 mA	0.625 W		4

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2SA2195	200	50 V	1700 mA	0.5 W
2SA2056	200	50 V	2000 mA	0.625 W
BC405	200	50 V	150 mA	0.35 W	75 MHz
2SA1054	200	60 V	600 mA	0.6 W
2N3550	200	45 V	100 mA	0.4 W	60 MHz
BCM62B	200	45 V	100 mA	0.39 W	100 MHz
2SA2060	200	50 V	2000 mA	1 W
2SA2070	200	50 V	1000 mA	1 W

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
BAJA EVH 5150 Overdrive Vero32×23 Verified 2SK117 · BC557B · TL061 · TL062 BAJA EVH 5150 Overdrive	BAJA EVH 5150 Overdrive	Preamp / Amp-in-a-box	Dirtbox Layouts	—	5	—	45
BAJA EVH 5150 Overdrive w. MTKs gain mods Vero32×23 Verified 2SK117 · BC557B · TL061 · TL062 BAJA EVH 5150 Overdrive	BAJA EVH 5150 Overdrive	Preamp / Amp-in-a-box	Dirtbox Layouts	—	5	—	50
Ricochet PCB reverb compare to the Surfy Surfybear guitar effects pedal 2N5457 · BC557B · IRF510 · IRF9510 Surfy SurfyBear Reverb · 1590BB	Surfy SurfyBear Reverb	Reverb	Griffin Effects	1590BB	—	$16.00	35
Carlin Phaser v2 BC547B · BC557B	—	Phaser	Moody Sounds	—	—	kr1695.00 out	73
Carlin Ringmodulator BC557B	—	Ring Mod / Synth	Moody Sounds	—	3	kr795.00	46
General Tso’s Compressor BC549C · BC557B · J113 · OPA2134 ThorpyFX Fat General · 125B	ThorpyFX Fat General	Compressor	PedalPCB	125B	4	$12.00	63