Parts · Transistors

2N4121

Si PNP BJT.1 circuit uses this part.

Substitutes Si PNP 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
2N4121	70	40 V	100 mA	0.2 W	450 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
BC213L	70	30 V	200 mA	0.3 W	200 MHz	1
BC177	70	45 V	100 mA	0.3 W	130 MHz	2
2SA1048	70	50 V	150 mA	0.2 W	80 MHz	6
BC307	75	45 V	100 mA	0.3 W	100 MHz	1
TIS93	100	40 V	400 mA	0.625 W		4
2SA1015	70	50 V	150 mA	0.4 W	80 MHz	8
BC556	75	65 V	100 mA	0.5 W	150 MHz	1
2N3906	100	40 V	200 mA	0.31 W	250 MHz	324

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
PN4916	70	30 V	100 mA	0.2 W	400 MHz
2SA1378	70	35 V	500 mA	0.2 W	300 MHz
2N4034	70	40 V	100 mA	0.36 W	400 MHz
BFR69	70	45 V	150 mA	0.1 W
BFR69VI	70	45 V	150 mA	0.1 W
2SA1623	65	45 V	100 mA	0.3 W
BSW44A	75	50 V	200 mA	0.3 W
BSW44AK	75	50 V	200 mA	0.3 W

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	EMU Waveshaper 2N4121 · 2N5828 · 3080 · 556	—	Ring Mod / Synth	Experimentalists Anonymous	—	—	—	45