Parts · Transistors

ZTX649

Si NPN BJT E-Line TH.2 circuits use this part. Listed as: BJT transistor, NPN TO-92.

Datasheet · from diodes.com

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
ZTX649	100	25 V	2000 mA	1 W	150 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
2N3700	100	80 V	1000 mA	0.5 W	100 MHz	4
2SD1616A	135	60 V	1000 mA	0.75 W	100 MHz	1
2SC1852	160	50 V	1000 mA	0.625 W	100 MHz	1
2SD667	60	80 V	1000 mA	0.9 W	70 MHz	1
2SC932	70	20 V	3000 mA	10 W	60 MHz	1
MPS-U05	60	60 V	2000 mA	10 W	170 MHz	1
ZTX618	300	20 V	3500 mA	1 W	100 MHz	2
BC639	40	80 V	1000 mA	1 W	50 MHz	2

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2SC4483	100	25 V	1500 mA	1 W	150 MHz
2SC4484	100	25 V	2500 mA	1 W	150 MHz
KSC2328	100	30 V	2000 mA	1 W	120 MHz
KSC2883	100	30 V	1500 mA	1 W	120 MHz
BCX5416	100	45 V	1000 mA	1 W	150 MHz
2SC4486	100	50 V	2000 mA	1 W	150 MHz
2SC4487	100	50 V	3000 mA	1 W	150 MHz
BSY84	100	35 V	1000 mA	0.9 W	120 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Creepy Fingers Regulus 8 Fuzz Vero13×13 Verified ZTX618 · ZTX649 Creepy Fingers Regulus 8 Fuzz	Creepy Fingers Regulus 8 Fuzz	Fuzz	Dirtbox Layouts	—	3	—	21
	Regular Fuzz ZTX618 · ZTX649 Creepy Fingers Regulus VIII · 125B	Creepy Fingers Regulus VIII	Fuzz	PedalPCB	125B	5	$8.00	24