Parts · Transistors

BC239

Si NPN BJT TO-92 TH.7 circuits use this part.

Substitutes Si NPN transistor

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	hFE min	Vce	Ic	Pc	fT
BC239	200	20 V	100 mA	0.3 W	150 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
BC108B	200	20 V	100 mA	0.3 W	150 MHz	20
BC109B	200	20 V	100 mA	0.3 W	150 MHz	13
BC238B	200	20 V	100 mA	0.3 W	150 MHz	2
BC149	200	20 V	200 mA	0.25 W	150 MHz	6
BC149B	200	20 V	200 mA	0.25 W	150 MHz	1
BC349B	200	20 V	100 mA	0.3 W	125 MHz	1
BC319	200	20 V	150 mA	0.31 W	100 MHz	2
BC109	180	20 V	100 mA	0.3 W	150 MHz	50

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BCY57	200	20 V	200 mA	0.3 W	150 MHz
BC148B	200	20 V	200 mA	0.25 W	150 MHz
BC408B	200	20 V	100 mA	0.25 W	150 MHz
BC409	200	20 V	100 mA	0.25 W	150 MHz
BC409B	200	20 V	100 mA	0.25 W	150 MHz
BCF29B	200	20 V	200 mA	0.25 W	165 MHz
BCF92	200	20 V	200 mA	0.25 W	165 MHz
BCW49	200	20 V	100 mA	0.2 W	150 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Skreddy Top Fuel Vero19×19 Unverified 2N5088 · 2N7000 · BC239 Skreddy Top Fuel	Skreddy Top Fuel	Distortion	Dirtbox Layouts	—	3	—	44
Solid Gold Fx Rosie Vero16×11 Verified BC239 · J201 Solid Gold Fx Rosie	Solid Gold Fx Rosie	Fuzz	Dirtbox Layouts	—	3	—	23
Skreddy Top Fuel Perfboard Verified 2N5088 · 2N7000 · BC239 Skreddy Top Fuel	Skreddy Top Fuel	Distortion	Effects Layouts (blog)	—	3	—	41
Solid Gold FX Rosie Perfboard Verified BC239 · J201 Solid Gold Fx Rosie	Solid Gold Fx Rosie	Fuzz	Effects Layouts (blog)	—	3	—	23
May Boost BC239 Fryer Treble Boost · 1590B	Fryer Treble Boost	Boost	On The Road Effects	1590B	1	$8.00	18
Electro Harmonix Black Finger Compressor/Sustainer Vero22×23 Unverified 741 · 7660S · BC239 · BC309 Electro-Harmonix Black Finger Compressor/Sustainer	Electro-Harmonix Black Finger Compressor/Sustainer	Compressor	Tagboard Effects	—	3	—	37
Greg Fryer Treble Booster Deluxe Vero13×9 Verified BC239 Greg Fryer Treble Booster Deluxe	Greg Fryer Treble Booster Deluxe	Boost	Tagboard Effects	—	—	—	16