Parts · Transistors

MP38

Ge NPN BJT TH.3 circuits use this part.

Substitutes Ge NPN 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
MP38	25	15 V	20 mA	0.15 W	2 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
MP37B	25	30 V	20 mA	0.15 W	1 MHz	2
MP10B	25	30 V	20 mA	0.15 W	1 MHz	2
MP14B	30	30 V	20 mA	0.15 W	1 MHz	1
2N1302	20	25 V	300 mA	0.15 W	1 MHz	6
2SD77	40	25 V	100 mA	0.15 W	2 MHz	1
MP38A	45	15 V	20 mA	0.15 W	2 MHz	10
MP37	15	15 V	20 mA	0.15 W	1 MHz	2
2N1304	40	20 V	300 mA	0.15 W	4 MHz	4

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N292A	25	15 V	20 mA	0.1 W	2 MHz
2N1891	25	15 V	300 mA	0.15 W	5 MHz
2N1995	25	15 V	300 mA	0.15 W	5 MHz
2N358	25	18 V	500 mA	0.1 W	4 MHz
2N585	20	15 V	200 mA	0.12 W	2 MHz
2SC90	20	15 V	400 mA	0.12 W	2 MHz
2SC90H	20	15 V	400 mA	0.12 W	2 MHz
2N385	30	25 V	200 mA	0.15 W	2 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
PedalPCB / Chuck D. Bones Fooh Vero20×17 Verified BC549C · BS170 · MP38 PedalPCB Chuck D. Bones Fooh	PedalPCB Chuck D. Bones Fooh	Distortion	Dirtbox Layouts	—	4	—	33
Zzoyds Black Velvet Fuzz Vero15×13 Unverified MP37 · MP38 Zzoyds Black Velvet Fuzz	Zzoyds Black Velvet Fuzz	Fuzz	Dirtbox Layouts	—	4	—	26
Germanium Giant Vero12×6 Verified MP38 Germanium Giant	Germanium Giant	Boost	Tagboard Effects	—	2	—	8