Parts · Transistors

2SC644S

Si NPN BJT.1 circuit uses 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
2SC644	350	25 V	50 mA	0.15 W	75 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
2SC871	350	25 V	30 mA	0.2 W	75 MHz	1
2SC2458BL	350	50 V	150 mA	0.2 W	80 MHz	1
BC169C	380	20 V	100 mA	0.3 W	85 MHz	5
2N5089	400	25 V	50 mA	0.31 W	50 MHz	362
BC318C	400	30 V	150 mA	0.31 W	100 MHz	3
2N3704	300	30 V	800 mA	0.36 W	100 MHz	2
2N5088	300	30 V	50 mA	0.31 W	50 MHz	1044
2N5828	400	40 V	100 mA	0.36 W	90 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2SC631	350	25 V	100 mA	0.18 W	70 MHz
2SC374B	350	30 V	100 mA	0.2 W	80 MHz
2SC632	350	40 V	100 mA	0.18 W	70 MHz
2SC2712BL	350	50 V	150 mA	0.15 W	80 MHz
2SC733B	350	30 V	100 mA	0.3 W	80 MHz
2SC711	300	25 V	50 mA	0.2 W	75 MHz
2SC316	350	32 V	30 mA	0.3 W	60 MHz
2SC4116-BL	350	60 V	150 mA	0.1 W	80 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Kay F1 Fuzz Tone Vero21×11 Verified 2SC644S · 2SC945 Kay F-1 Fuzz Tone	Kay F-1 Fuzz Tone	Fuzz	Tagboard Effects	—	—	—	18