Parts · Transistors

ECG123A

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
MPS3704	300	30 V	800 mA	0.625 W	100 MHz	2
2N2222	100	30 V	800 mA	0.5 W	250 MHz	51
2SD1616A	135	60 V	1000 mA	0.75 W	100 MHz	1
2N2219A	100	50 V	800 mA	0.8 W	300 MHz	2
2N4401	100	40 V	600 mA	0.31 W	250 MHz	24
MPSA05G	100	60 V	500 mA	0.63 W	100 MHz	2
2N3700	100	80 V	1000 mA	0.5 W	100 MHz	3
BC337	100	45 V	800 mA	0.36 W	60 MHz	1

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 · CD4049UBE · ECG123A	—	Octave / Pitch	Dead End FX	1590BBS	3	$15.00	38