Parts · Transistors

IT122

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
IT122	100	45 V	50 mA	0.3 W	180 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
2N4401	100	40 V	600 mA	0.31 W	250 MHz	52
BC107	110	45 V	100 mA	0.3 W	150 MHz	13
BC107A	110	45 V	100 mA	0.3 W	150 MHz	3
BC237	110	45 V	100 mA	0.3 W	150 MHz	1
TIS92	100	40 V	400 mA	0.625 W		4
2SC2785	110	50 V	100 mA	0.25 W	150 MHz	2
BC547A	110	45 V	100 mA	0.5 W	200 MHz	4
BC847	110	45 V	100 mA	0.2 W	150 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BCY56	100	45 V	200 mA	0.3 W	180 MHz
MPS6566	100	45 V	200 mA	0.31 W	200 MHz
PN3827	100	45 V	100 mA	0.31 W	200 MHz
2SC3330	100	50 V	200 mA	0.3 W	200 MHz
2SC3330R	100	50 V	200 mA	0.3 W	200 MHz
BC385	100	45 V	100 mA	0.3 W	150 MHz
BC582A	100	45 V	200 mA	0.3 W	150 MHz
BCW16K	100	45 V	500 mA	0.3 W	150 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Moog Memorymoog 2N3392 · 2N3904 · 2N3906 · 3080A	—	Ring Mod / Synth	Experimentalists Anonymous	—	—	—	93