Parts · Transistors

*2N3904

2 circuits use 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
2N3904	40	40 V	200 mA	0.31 W	300 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
2N3903	50	40 V	200 mA	0.31 W	250 MHz	8
MPSA05	50	60 V	500 mA	0.33 W	100 MHz	2
2N5845	25	40 V	1000 mA	0.625 W	300 MHz	1
2N3053	50	40 V	700 mA	1 W	100 MHz	1
MPSA06	50	80 V	500 mA	0.625 W	100 MHz	2
BC639	40	80 V	1000 mA	1 W	50 MHz	1
2SC536	60	30 V	100 mA	0.2 W	115 MHz	1
2SC1815	70	50 V	150 mA	0.4 W	80 MHz	28

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BFJ67	40	40 V	1000 mA	0.36 W
BFJ68	40	40 V	1000 mA	0.36 W
BSS79B	40	40 V	800 mA	0.35 W	250 MHz
BFV85A	40	40 V	800 mA	0.36 W	250 MHz
BFW68	40	40 V	200 mA	0.36 W	250 MHz
2SC945R	40	50 V	150 mA	0.25 W	300 MHz
KSC945	40	50 V	150 mA	0.25 W	300 MHz
BSS81B	40	35 V	800 mA	0.35 W	250 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Ducky Comp v2.3 *2N3904 · CA3080	Vintage replica Dyna Comp	Compressor	On The Road Effects	—	2	$14.99	32
	Ducky Comp v2.4 *2N3904 · LM13700	LM13700 Dyna Comp	Compressor	On The Road Effects	—	2	$14.99	32