Parts · Transistors

OC44

3 circuits use this part. Listed as: BJT transistor, PNP Germanium; Trans-Can-WIDE.

Substitutes Ge 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
OC44	100	12 V	10 mA	0.083 W	8 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
NTE102	90	16 V	150 mA	0.15 W	2 MHz	1
2N508	120	16 V	200 mA	0.2 W	2 MHz	1
MP41A	50	30 V	150 mA	0.15 W	1 MHz	1
NKT213	50	18 V	250 mA	0.2 W	0.5 MHz	1
OC75	55	20 V	10 mA	0.125 W	0.1 MHz	3
NKT275	30	15 V	250 mA	0.2 W	0.5 MHz	3
OC71	30	20 V	10 mA	0.125 W	0.3 MHz	5
OC76	30	32 V	125 mA	0.125 W	0.1 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
NKT62	100	10 V	25 mA	0.075 W	8 MHz
NKT32	100	10 V	10 mA	0.075 W	6 MHz
NKT42	100	10 V	10 mA	0.075 W	6 MHz
NKT53	100	10 V	10 mA	0.075 W	5 MHz
OC43	100	15 V	50 mA	0.08 W	15 MHz
2SA17H	120	10 V	15 mA	0.08 W	9 MHz
NKT143	100	12 V	25 mA	0.125 W	3 MHz
NKT144	100	12 V	25 mA	0.125 W	3 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Radian (Legacy) LT1054CP · OC44	Dallas Rangemaster	Boost	Aion FX	1590B	2	—	19
Zonky A02650 · OC44 · OC75 · TC1044SCPA	John Hornby Skewes Zonk Machine MKI	Fuzz	Five Cats Pedals	1590B	2	£4.50	25
Zonkbox A02650 · OC44 · OC75 · TC1044SCPA	DAM Zonk Machine	Fuzz	PedalPCB	125B	2	$8.00	25