Parts · Transistors

2SB172

Ge PNP BJT TH.5 circuits use this part.

Datasheet · archived copy; the part is discontinued and the maker no longer publishes it

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	12
MP41A	50	30 V	150 mA	0.15 W	1 MHz	2
2N1382	50	25 V	200 mA	0.25 W	1 MHz	1
ACY41	50	18 V	500 mA	0.26 W	1 MHz	5
MP20A	50	20 V	300 mA	0.15 W	2 MHz	1
OC79	50	13 V	300 mA	0.55 W	0.2 MHz	2
2G374	60	25 V	100 mA	0.15 W	1 MHz	1
2N270	70	12 V	150 mA	0.15 W	0.3 MHz	5

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

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Laika Fuzz V.2 2N3904 · 2SB172 · 2SK30A-Y · BS170 Spaceman Effects Sputnik II · 1590BBS	Spaceman Effects Sputnik II	Fuzz	Dead End FX	1590BBS	4	$7.50	55
Laika II 2N3904 · 2SB172 · 2SK30A-Y · BS170 Spaceman Effects Sputnik IIb · 1590BBS	Spaceman Effects Sputnik IIb	Fuzz	Dead End FX	1590BBS	4	$15.00	61
Nine Volt Nirvana Nitroburner Fuzz 2N3906 · 2SB172 Nine Volt Nirvana Nitroburner Fuzz	Nine Volt Nirvana Nitroburner Fuzz	Fuzz	Revolution Deux	—	5	—	21
Nine Volt Nirvana Nitroburner Fuzz Vero15×12 Verified 2N3906 · 2SB172 Nine Volt Nirvana Nitroburner Fuzz	Nine Volt Nirvana Nitroburner Fuzz	Fuzz	Tagboard Effects	—	4	—	19
Spaceman Sputnik II Vero24×21 Verified 2N3904 · 2SB172 · 2SK30 · BS170 Spaceman Effects Sputnik II	Spaceman Effects Sputnik II	Fuzz	Tagboard Effects	—	4	—	48