Parts · Transistors

BF256B

Si N-ch JFET TO-92 TH.1 circuit uses this part.

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
BF256B	30 V	13 mA	30 V	0.35 W

Used on other boards here

Part	Vgs max	Id max	Vds	Pd	Boards
2SK246		14 mA	50 V	0.3 W	9
2SK117		14 mA	50 V	0.3 W	42
2SK184		14 mA	50 V	0.2 W	9
NTE458		20 mA	50 V	0.25 W	2
2N5485	25 V	10 mA	25 V	0.35 W	27
2SK170		20 mA	40 V	0.2 W	10
2N4416	30 V	30 mA	30 V	0.3 W	1
J110		10 mA	25 V	0.4 W	1

Closest by the numbers

Part	Vgs max	Id max	Vds	Pd
BFW10	30 V	10 mA	30 V	0.3 W
BFW11	30 V	10 mA	30 V	0.3 W
2SK330		14 mA	50 V	0.2 W
BF861B		15 mA	25 V	0.25 W
2SK209		14 mA	50 V	0.15 W
2SK2145		14 mA	50 V	0.3 W
2SK662		20 mA	30 V	0.15 W
BFT46		10 mA	25 V	0.25 W

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Baby Box v5 BC547B · BC549C · BF256B · PT2399	—	Other	Moody Sounds	—	2	kr2695.00	85