Parts · Transistors

2SK3557

Si N-ch JFET.2 circuits use this part. Listed as: JFET transistor, N-channel; Transistor-TO-92 Inline Wide.

Datasheet · from onsemi.com

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
2SK3557		50 mA	15 V	0.2 W

Used on other boards here

Part	Vgs max	Id max	Vds	Pd	Boards
BF244A	30 V	50 mA	30 V	0.35 W	8
SST201		50 mA	40 V	0.36 W	1
J310		50 mA	25 V	0.4 W	1
2N3956	4 V	50 mA	50 V	0.25 W	1
2N3954	4 V	50 mA	50 V	0.25 W	1
2N3819	8 V	50 mA	25 V	0.35 W	33
J113		50 mA	35 V	0.4 W	88
J112		50 mA	35 V	0.4 W	24

Closest by the numbers

Part	Vgs max	Id max	Vds	Pd
2SK2394		50 mA	15 V	0.2 W
2SK508	3.5 V	50 mA	15 V	0.2 W
2N6453	5 V	50 mA	20 V	0.36 W
2N6454	5 V	50 mA	20 V	0.36 W
2SK2539		50 mA	15 V	0.2 W
2SK1000		50 mA	22 V	0.25 W
2SK1001		50 mA	22 V	0.25 W
2SK321		50 mA	15 V	0.2 W

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	29 Boost 2SK3557 · L78L05_TO92 · LF412 · LF412CP 29 Pedals jFet Boost · 1590B	29 Pedals jFet Boost	Boost	Five Cats Pedals	1590B	1	£4.50	48
	Skeptical Boost 2SK3557 · IAB0105D12 · L78L05 · LF412 29 Pedals jFet Boost · 125B	29 Pedals jFet Boost	Fuzz	PedalPCB	125B	2	$12.00	48