Parts · Transistors

BC557

Si PNP BJT TO-92 TH.20 circuits use this part. Listed as: Transistor BC557.

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
BC557	75	45 V	200 mA	0.3 W	75 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
BC307	75	45 V	100 mA	0.3 W	100 MHz	1
2SA1015	70	50 V	150 mA	0.4 W	80 MHz	8
2SA1048	70	50 V	150 mA	0.2 W	80 MHz	6
BC177	70	45 V	100 mA	0.3 W	130 MHz	2
2SA659	80	50 V	200 mA	0.3 W	45 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
TIS93	100	40 V	400 mA	0.625 W		4

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BSW44A	75	50 V	200 mA	0.3 W
BSW44AK	75	50 V	200 mA	0.3 W
BSW44B	75	60 V	200 mA	0.3 W
BC204	75	45 V	100 mA	0.3 W	100 MHz
BC417	72	45 V	100 mA	0.25 W	75 MHz
2N6223	75	60 V	100 mA	0.36 W
2N2432AUB	80	45 V	100 mA	0.36 W
2SA561O	70	50 V	150 mA	0.3 W	70 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Crowther Hot Cake 2008 version Vero18×13 Verified BC557 · TL071 Crowther Hot Cake 2008 version	Crowther Hot Cake 2008 version	Distortion	Dirtbox Layouts	—	3	—	26
Ghost Effects Warmjet V Vero22×17 Verified BC108B · BC557 Ghost Effects Warmjet V	Ghost Effects Warmjet V	Fuzz	Dirtbox Layouts	—	3	—	28
Hell's Gain Perfboard Verified 7660S · BC557 · ICL7660S · TL072 Handmades HG-1 Hell's Gain · 1590BB	Handmades HG-1 Hell's Gain	Distortion	Effects Layouts (blog)	1590BB	6	—	43
Shin Ei OB-28 Octave Box Perfboard Unverified BC547 · BC557 Shin-ei OB-28 Octave Box	Shin-ei OB-28 Octave Box	Octave / Pitch	Effects Layouts (blog)	—	2	—	38
120 Second voice recorder BC547 · BC557 · ISD25120	—	Delay	Experimentalists Anonymous	—	—	—	30
120 Second voice recorder 2 BC547 · BC557 · ISD25120	—	Delay	Experimentalists Anonymous	—	—	—	30
40 Second Message Recorder with Loop Option BC547 · BC557 · ISD2540	—	Delay	Experimentalists Anonymous	—	—	—	29
40 Second Recorder BC547 · BC557 · ISD2540	—	Delay	Experimentalists Anonymous	—	—	—	30
Carlin phaser 741 · BC547 · BC557 · BD139	—	Phaser	Experimentalists Anonymous	—	3	—	32
ISD25xx Recording Device BC547 · BC557 · ISD2540	—	Delay	Experimentalists Anonymous	—	—	—	31
MXR Flanger 4013 · 4558 · BC547 · BC548 MXR Flanger	MXR Flanger	Flanger	Experimentalists Anonymous	—	4	—	47
Old-Style VCF BC547 · BC557	—	Other	Experimentalists Anonymous	—	2	—	22
Aquarius Preamp BC547 · BC557 · IRF740 · LND150N3-G 1590BB	—	Preamp / Amp-in-a-box	HotKits	1590BB	7	$14.00	50
Belladonna Tube Overdrive BC547 · BC557 · IRF740 · NE555 1590BB2	—	Overdrive	HotKits	1590BB2	5	$14.00	44
Crystalline Preamp 4558 · BC547 · BC557 · IRF740 Trace Elliot V-Type · 1590XX	Trace Elliot V-Type	Preamp / Amp-in-a-box	HotKits	1590XX	10	$16.00	50
Datura Tube Overdrive BC547 · BC557 · IRF740 · NE555 1590BB2	—	Overdrive	HotKits	1590BB2	5	$69.00	41
Melissa Tube Overdrive 2N3904 · BC547 · BC557 · IRF740 Friedman BE100 BE Channel · 1590BB2	Friedman BE100 BE Channel	Overdrive	HotKits	1590BB2	5	$14.00	43
Mr. Gator Preamp BC547 · BC557 · BF245 · IPA60R180P7S Laboga Mr. Hector preamp · 1590XX	Laboga Mr. Hector preamp	Preamp / Amp-in-a-box	HotKits	1590XX	9	— out	67
Old Sparky Preamp BC547 · BC557 · BF245 · IPA60R180P7S Friedman BE Deluxe & Small Box preamp · 1590XX	Friedman BE Deluxe & Small Box preamp	Preamp / Amp-in-a-box	HotKits	1590XX	9	$27.00	63
Fred Briggs Octave Ringmod Fuzzer (ORF) BC548 · BC557 · J201 · LF351 Fred Briggs Octave Ringmod Fuzzer	Fred Briggs Octave Ringmod Fuzzer	Fuzz	Revolution Deux	—	5	—	27