Parts · Transistors

ZTX109

Si NPN BJT E-Line TH.2 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
ZTX109	240	30 V	100 mA	0.3 W	150 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
BC184	240	30 V	200 mA	0.3 W	150 MHz	15
BC183B	240	30 V	200 mA	0.3 W	150 MHz	3
BC184B	240	30 V	200 mA	0.3 W	150 MHz	1
BC209	240	45 V	100 mA	0.3 W	150 MHz	1
ZTX382B	240	45 V	100 mA	0.45 W	150 MHz	1
BC182B	240	50 V	200 mA	0.3 W	120 MHz	3
MPS6515	250	25 V	100 mA	0.31 W	200 MHz	3
2SC539	250	25 V	50 mA	0.3 W	100 MHz	3

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BC383B	240	30 V	100 mA	0.3 W	150 MHz
BC384B	240	30 V	100 mA	0.3 W	150 MHz
BC173B	240	25 V	100 mA	0.3 W	150 MHz
BSW88B	250	30 V	100 mA	0.3 W
BSW89B	250	30 V	100 mA	0.3 W
BCW83B	240	30 V	100 mA	0.225 W	150 MHz
BCW84B	240	30 V	100 mA	0.225 W	150 MHz
MPS9633	250	30 V	100 mA	0.35 W	150 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	MXR Analog Delay 1 1458 · 2N4126 · 340L12 · 4013 MXR Analog Delay	MXR Analog Delay	Delay	Experimentalists Anonymous	—	3	—	119
	MXR Analog Delay 2 2N4126 · 340LA12 · 4001 · 4013 MXR Analog Delay	MXR Analog Delay	Delay	Experimentalists Anonymous	—	—	—	119