Parts · Transistors

BC639

1 circuit uses this part.

Substitutes Si 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
BC639	40	80 V	1000 mA	1 W	50 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
MPSA06	50	80 V	500 mA	0.625 W	100 MHz	2
2N3700	100	80 V	1000 mA	0.5 W	100 MHz	3
MPSA05G	100	60 V	500 mA	0.63 W	100 MHz	2
2SD1616A	135	60 V	1000 mA	0.75 W	100 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N2985	40	80 V	3000 mA	1 W	50 MHz
BCX40	40	80 V	2000 mA	1 W	50 MHz
BCX40-4	40	80 V	2000 mA	1 W	50 MHz
2N1893	40	80 V	500 mA	0.8 W	50 MHz
2N2243	40	80 V	1000 mA	0.8 W	50 MHz
BFR77	40	80 V	1000 mA	0.8 W	50 MHz
BFW33	40	80 V	500 mA	0.8 W	50 MHz
BSS32	40	80 V	500 mA	0.8 W	50 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Stretta BC639 · LF347N · LT1054	Cicognani SexyComp 76, but in a smaller format	Compressor	Dead End FX	125B	6	$12.00	48