Parts · Transistors

2SB172

2 circuits use this part.

Substitutes Ge 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
2SB172	50		125 mA	0.125 W	0.4 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
NKT213	50	18 V	250 mA	0.2 W	0.5 MHz	1
MP41A	50	30 V	150 mA	0.15 W	1 MHz	1
OC79	50	13 V	300 mA	0.55 W	0.2 MHz	1
NKT275	30	15 V	250 mA	0.2 W	0.5 MHz	3
GT402B	60	25 V	500 mA	0.6 W	1 MHz	1
AC128	45	16 V	1000 mA	1 W	1 MHz	9
2G381	75	20 V	500 mA	0.25 W	1 MHz	1
OC76	30	32 V	125 mA	0.125 W	0.1 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N568	50	25 V	300 mA	0.12 W	0.5 MHz
2N422	50	20 V	100 mA	0.15 W	0.35 MHz
AC116	50	18 V	200 mA	0.145 W	0.5 MHz
AC123	50	32 V	200 mA	0.145 W	0.5 MHz
2N1955	50	18 V	200 mA	0.2 W
2N567	50	25 V	300 mA	0.15 W	0.5 MHz
2N133A	50	30 V	100 mA	0.1 W	0.3 MHz
NKT210	50	30 V	500 mA	0.2 W	0.5 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Laika Fuzz V.2 2N3904 · 2SB172 · 2SK30A-Y · BS170	Spaceman Effects Sputnik II	Fuzz	Dead End FX	1590BBS	4	$7.50	58
	Laika II 2N3904 · 2SB172 · 2SK30A-Y · BS170	Spaceman Effects Sputnik IIb	Fuzz	Dead End FX	1590BBS	4	$15.00	58