Parts · Transistors

MP38A

4 circuits use this part. Listed as: Germanium NPN.

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
MP38A	45	15 V	20 mA	0.15 W	2 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
2N1304	40	20 V	300 mA	0.15 W	4 MHz	2
AC127	50	12 V	500 mA	0.34 W	1.5 MHz	3
2N1306	60	15 V	300 mA	0.15 W	8 MHz	1
NTE103	90	16 V	250 mA	0.15 W	2 MHz	2
GT404B	60	25 V	500 mA	0.6 W	1 MHz	1
MP37B	25	30 V	20 mA	0.15 W	1 MHz	1
MP10B	25	30 V	20 mA	0.15 W	1 MHz	1
2N1308	80	15 V	300 mA	0.15 W	12 MHz	6

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
AC130	50	15 V	100 mA	0.145 W	2 MHz
2N312	50	15 V	200 mA	0.1 W
2SC182	45	20 V	100 mA	0.125 W	3 MHz
AC183	50	16 V	150 mA	0.25 W	2 MHz
2SC129	45	20 V	200 mA	0.15 W	4 MHz
AC185	50	16 V	500 mA	0.27 W	2 MHz
2N1391	40	18 V	200 mA	0.15 W	3 MHz
AC172	45	12 V	10 mA	0.2 W	1 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Range Bender 2N2222A · MP38A	Colorsound Hybrid Tone Bender	Fuzz	Effects Layouts	125B	4	$7.00	43
Slava Ukraine GT310B · KP103G · KP103L · KT315A	Ltava	Tremolo	PCB Guitar Mania	1590DD	8	€1.00 out	127
Aberration Fuzz BC107B · MP38A	Great Eastern FX Co Focus Fuzz	Fuzz	PedalPCB	125B	3	$12.00	45
Bog Fuzz BC549C · BC560C · MP38A	Dunlop JHF-3	Fuzz	Sheepylove	—	3	€10.00	36