Parts · Transistors

MP20A

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
MP20A	50	20 V	300 mA	0.15 W	2 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
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
NKT213	50	18 V	250 mA	0.2 W	0.5 MHz	12
OC83N	40	20 V	1000 mA	0.22 W	1 MHz	1
2N1307	60	15 V	300 mA	0.15 W	8 MHz	6
2N526	65	30 V	500 mA	0.225 W	1 MHz	1
2N527	80	30 V	500 mA	0.225 W	2 MHz	2

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N1955	50	18 V	200 mA	0.2 W
2N1448	50	25 V	400 mA	0.2 W	2 MHz
2N2000	50	20 V	1000 mA	0.3 W	2 MHz
2N654	50	30 V	250 mA	0.2 W	2 MHz
2N1174	50	20 V	200 mA	0.25 W	3 MHz
2N361	50	18 V	200 mA	0.17 W	1 MHz
2SA205	45	15 V	200 mA	0.2 W	2 MHz
2N1093	50	15 V	250 mA	0.15 W	4 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Fuzzhead Fx Harmonic Gyrolator Vero19×18 Verified BC108B · MP20A · TLC274 Fuzzhead Fx Harmonic Gyrolator	Fuzzhead Fx Harmonic Gyrolator	Fuzz	Dirtbox Layouts	—	5	—	38