Parts · Transistors

J309

Si N-ch JFET TO-92 TH.8 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
J309	4 V	30 mA	25 V	0.625 W

Used on other boards here

Part	Vgs max	Id max	Vds	Pd	Boards
J310		50 mA	25 V	0.4 W	1
NTE458		20 mA	50 V	0.25 W	2
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
SST201		50 mA	40 V	0.36 W	1
2N3956	4 V	50 mA	50 V	0.25 W	1
2N3954	4 V	50 mA	50 V	0.25 W	1

Closest by the numbers

Part	Vgs max	Id max	Vds	Pd
PN5434	4 V	30 mA	25 V	0.35 W
2SK146		30 mA	40 V	0.6 W
2SK147		30 mA	40 V	0.6 W
2SK363		30 mA	40 V	0.4 W
2SK163		30 mA	50 V	0.4 W
2SK523		30 mA	50 V	0.4 W
2SK533		30 mA	50 V	0.4 W
BF861C		25 mA	25 V	0.25 W

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
JHS Fumble Boost Vero9×10 Verified J309 JHS Fumble	JHS Fumble	Boost	Dirtbox Layouts	—	2	—	14
BBC ONE J309 DUMBLE BBC-1 / JHS NOTADÜMBLË Clean Channel · 1590B	DUMBLE BBC-1 / JHS NOTADÜMBLË Clean Channel	Boost	Five Cats Pedals	1590B	3	£4.00	18
BBC Dumb J309 JHS Fumble · 1590B	JHS Fumble	Boost	Fuzz Dog	1590B	2	£24.00	16
NostalgiTone DumbleTone Deluxe Dual Combo J309 1590BB2	—	Other	GuitarPCB	1590BB2	6	— out	16
NostalgiTone FrontStage: Boutique Dumble J309 Dumble · 125B	Dumble	Boost	GuitarPCB	125B	2	$7.95 out	17
Fumble J309 JHS Fumble	JHS Fumble	Other	PCBWay: Glory to Ukraine	—	2	—	15
Fumble Boost J309 JHS Fumble · 125B	JHS Fumble	Boost	PedalPCB	125B	2	$10.00	16
Cast Sheep J309 JHS Fumble	JHS Fumble	Boost	Sheepylove	—	3	€5.00	16