Parts · Transistors

ZTX618

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
ZTX618	300	20 V	3500 mA	1 W	100 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
ZTX649	100	25 V	2000 mA	1 W	150 MHz	2
2SC932	70	20 V	3000 mA	10 W	60 MHz	1
MPS-U05	60	60 V	2000 mA	10 W	170 MHz	1
2SD234	40	50 V	3000 mA	25 W	0.5 MHz	3

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2SC3072C	300	20 V	5000 mA	1 W	100 MHz
2SC3671C	300	20 V	5000 mA	1 W	100 MHz
2SC3266BL	350	20 V	2000 mA	0.75 W	120 MHz
2SC2982C	300	30 V	2000 mA	0.5 W	150 MHz
2SC6062	250	30 V	5000 mA	0.8 W
2SC5714	400	20 V	4000 mA	1 W
2SC5976	250	30 V	3000 mA	0.625 W
2SC6126	250	50 V	3000 mA	1 W

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