Parts · Transistors

2N3954

Si N-ch JFET.1 circuit uses this part.

Substitutes N-channel JFET

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	Vgs max	Id max	Vds	Pd
2N3954	4 V	50 mA	50 V	0.25 W

Used on other boards here

Part	Vgs max	Id max	Vds	Pd	Boards
2N3956	4 V	50 mA	50 V	0.25 W	1
SST201		50 mA	40 V	0.36 W	1
NTE458		20 mA	50 V	0.25 W	2
2SK170		20 mA	40 V	0.2 W	10
2N4391		150 mA	40 V	1.8 W	2
2N4393		150 mA	40 V	1.8 W	1
2SK117		14 mA	50 V	0.3 W	42
2SK246		14 mA	50 V	0.3 W	9

Closest by the numbers

Part	Vgs max	Id max	Vds	Pd
2N3955	4 V	50 mA	50 V	0.25 W
2N3957	4 V	50 mA	50 V	0.25 W
2N3958	4 V	50 mA	50 V	0.25 W
2SK162		50 mA	40 V	0.4 W
BSR56		50 mA	40 V	0.25 W
J203		50 mA	40 V	0.36 W
J204		50 mA	40 V	0.36 W
2N4340	3 V	50 mA	50 V	0.3 W

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Moog 952 Keyboard Controller 2N3904 · 2N3954 · 741 · LM308	—	Ring Mod / Synth	Experimentalists Anonymous	—	2	—	78