Parts · Transistors

2N4859A

Si N-ch JFET.2 circuits use 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
2N4859A	10 V	50 mA	30 V	0.36 W

Used on other boards here

Part	Vgs max	Id max	Vds	Pd	Boards
J113		50 mA	35 V	0.4 W	88
J112		50 mA	35 V	0.4 W	24
J111		50 mA	35 V	0.4 W	17
J310		50 mA	25 V	0.4 W	1
SST201		50 mA	40 V	0.36 W	1
J108		80 mA	25 V	0.4 W	1
2N3819	8 V	50 mA	25 V	0.35 W	33
2N3956	4 V	50 mA	50 V	0.25 W	1

Closest by the numbers

Part	Vgs max	Id max	Vds	Pd
2N5638		50 mA	30 V	0.35 W
2N4856	10 V	50 mA	40 V	0.36 W
2SK162		50 mA	40 V	0.4 W
BSR56		50 mA	40 V	0.25 W
2SK520		50 mA	30 V	0.2 W
J212		40 mA	25 V	0.4 W
2N5640		50 mA	30 V	0.35 W
2N5653		40 mA	30 V	0.625 W

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Electro Harmonix 16 second delay Analog part 2N4859A · 2N5087 · 2N5088 · 4558 Electro-Harmonix 16 second delay Analog part	Electro-Harmonix 16 second delay Analog part	Delay	Experimentalists Anonymous	—	—	—	67
	Electro Harmonix Guitar Synth 1048 · 1458 · 2N4859A · 2N5087 Electro-Harmonix Guitar Synth	Electro-Harmonix Guitar Synth	Ring Mod / Synth	Experimentalists Anonymous	—	—	—	234