Parts · Transistors

MP40

Ge PNP BJT TH.1 circuit uses 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
MP40	20	15 V	150 mA	0.15 W	1 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
MP39B	20	15 V	150 mA	0.15 W	0.5 MHz	5
NKT275	30	15 V	250 mA	0.2 W	0.5 MHz	13
GT402D	30	25 V	500 mA	0.6 W	1 MHz	2
AC151	30	24 V	200 mA	0.9 W	1 MHz	2
OC83N	40	20 V	1000 mA	0.22 W	1 MHz	1
MP41A	50	30 V	150 mA	0.15 W	1 MHz	2
ACY41	50	18 V	500 mA	0.26 W	1 MHz	5
2N1382	50	25 V	200 mA	0.25 W	1 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N1450	20	20 V	100 mA	0.12 W
2N1303	20	25 V	300 mA	0.15 W	1 MHz
2N1451	20	20 V	400 mA	0.2 W	1 MHz
AC524	20	30 V	500 mA	0.15 W	1 MHz
ACY27	20	20 V	200 mA	0.2 W	0.8 MHz
2N680	18	20 V	100 mA	0.15 W
2N1145	25	15 V	100 mA	0.14 W	1 MHz
2N111	25	15 V	200 mA	0.13 W	1 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Point Reyes Kuiama Fuzz Vero16×16 Verified 1044 · MP40 · TC1044 Point Reyes Kuiama Fuzz	Point Reyes Kuiama Fuzz	Fuzz	Dirtbox Layouts	—	2	—	19