Parts · Transistors

ECG123A

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
ECG123A	200	40 V	800 mA	0.5 W	300 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
2SC1852	160	50 V	1000 mA	0.625 W	100 MHz	1
TIS92	100	40 V	400 mA	0.625 W		4
2N3704	300	30 V	800 mA	0.36 W	100 MHz	2
2N2222	100	30 V	800 mA	0.5 W	250 MHz	129
2SD1616A	135	60 V	1000 mA	0.75 W	100 MHz	1
2N4401	100	40 V	600 mA	0.31 W	250 MHz	52
2N2219	100	30 V	800 mA	0.8 W	250 MHz	2
MPSA05G	100	60 V	500 mA	0.63 W	100 MHz	6

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2SCR542P	200	30 V	5000 mA	0.5 W	250 MHz
2N4425	180	40 V	500 mA	0.56 W
2SC5906	200	30 V	4000 mA	0.8 W
2SCR543R	180	50 V	4000 mA	0.5 W	300 MHz
PN3417	180	50 V	500 mA	0.5 W
2N4953	200	30 V	500 mA	0.36 W	250 MHz
2N5370	200	30 V	500 mA	0.36 W	250 MHz
2SCR533P	180	50 V	3000 mA	0.5 W	320 MHz

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Comfy Plum 2N5138 · CD4049UB · CD4049UBE · ECG123A 1590BBS	—	Octave / Pitch	Dead End FX	1590BBS	3	$15.00	43