Parts · Transistors

BC108A

Si NPN BJT TO-18 / TO-92 TH.3 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
BC108A	120	20 V	100 mA	0.3 W	150 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
S8050	120	25 V	500 mA	0.3 W	150 MHz	1
BC183	120	30 V	200 mA	0.3 W	150 MHz	7
BC183A	120	30 V	200 mA	0.3 W	150 MHz	3
KC508	125	20 V	100 mA	0.3 W	175 MHz	1
BC238	110	20 V	100 mA	0.3 W	150 MHz	2
BC182	120	50 V	200 mA	0.3 W	150 MHz	7
PN4124	120	25 V	200 mA	0.625 W	170 MHz	2
BC107	110	45 V	100 mA	0.3 W	150 MHz	13

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BC109A	120	20 V	100 mA	0.3 W	150 MHz
BC585	120	20 V	100 mA	0.35 W
BC208A	125	20 V	100 mA	0.3 W	150 MHz
BC386A	125	20 V	100 mA	0.3 W	150 MHz
BCAP08	125	20 V	100 mA	0.3 W	150 MHz
BCAP08A	125	20 V	100 mA	0.3 W	150 MHz
2SC2986Y	120	30 V	50 mA	0.3 W	150 MHz
2SC735Y	120	30 V	400 mA	0.3 W	150 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Vox Distortion Module 1358B Vero11×10 Unverified BC108A Vox Distortion Module 1358B	Vox Distortion Module 1358B	Fuzz	Dirtbox Layouts	—	2	—	14
Vox Distortion Booster V2 Vero9×10 Unverified BC108A Vox Distortion Booster V2	Vox Distortion Booster V2	Distortion	Tagboard Effects	—	2	—	10
VOX Repeat Percussion VeroTagboard 2N2646 · BC108A · BC109B Vox Repeat Percussion	Vox Repeat Percussion	Tremolo	turretboard.org	—	2	—	20