Parts · Transistors

MMBF4393

8 circuits use this part. Listed as: JFET, N-channel, SOT-23.

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
MMBF4393	3 V	30 mA	30 V	0.35 W

Used on other boards here

Part	Vgs max	Id max	Vds	Pd	Boards
J309	4 V	30 mA	25 V	0.625 W	5
2SK170		20 mA	40 V	0.2 W	2
J113		50 mA	35 V	0.4 W	26
J112		50 mA	35 V	0.4 W	4
J111		50 mA	35 V	0.4 W	1
2N5459	4.5 V	16 mA	25 V	0.625 W	2
PF5102	1.6 V	20 mA	40 V	0.625 W	14
2N5952	3 V	8 mA	30 V	0.36 W	14

Closest by the numbers

Part	Vgs max	Id max	Vds	Pd
2N5564	3 V	30 mA	40 V	0.65 W
2N5565	3 V	30 mA	40 V	0.65 W
2N5566	3 V	30 mA	40 V	0.65 W
2SK163		30 mA	50 V	0.4 W
2SK425		30 mA	50 V	0.2 W
2N5639		25 mA	30 V	1.35 W
2SK146		30 mA	40 V	0.6 W
PN4392		25 mA	40 V	0.36 W

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Asteria Mk. III Preamp Drive MMBF4393	Catalinbread Formula 55	Overdrive	Aion FX	125B	4	$12.50	58
Ceres Preamp Drive MMBF4393 · PN2222A	Catalinbread Sabbra Cadabra	Overdrive	Aion FX	125B	4	$12.50	66
Gaia Mk. II Preamp Drive MMBF4393 · PN2222A	Catalinbread Galileo	Overdrive	Aion FX	125B	3	$12.50	62
Triton Mk. III Preamp Drive MMBF4393	Dirty Little Secret Mk. III	Overdrive	Aion FX	125B	3	$12.50	64
Tweed Man Overdrive MMBF4393 · MPF4393	Catalinbread Formula 5F6	Fuzz	PedalPCB	125B	7	$12.00	60
Celestial Screamer MMBF4393 · TL072	hot rod Tube Screamer	Overdrive	Sheepylove	—	8	€10.00	52
Desert Bighorn 2N3903 · MMBF4393	Animals Diamond Peak Overdrive	Distortion	Sheepylove	—	6	€10.00	37
Thunder Gun Express GE NPN · MMBF4393	Apocalypse Audio Thundertone	Overdrive	Sheepylove	—	6	€10.00	42