Parts · Transistors

2N5551

Si NPN BJT.6 circuits use this part.

Datasheet · from onsemi.com

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
2N5551	80	160 V	600 mA	0.31 W	100 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
KSP42	40	300 V	500 mA	0.625 W	50 MHz	3

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
2N5550	80	140 V	600 mA	0.31 W	100 MHz
2N25551	80	160 V	600 mA	0.625 W	100 MHz
2N5831	80	140 V	600 mA	0.625 W	100 MHz
2SC2881O	80	120 V	800 mA	0.5 W	120 MHz
BCPC4373	80	120 V	800 mA	0.5 W	120 MHz
2SC2881A	80	250 V	800 mA	0.5 W	120 MHz
2SC2316O	80	120 V	800 mA	0.9 W	120 MHz
KSC2316	80	120 V	800 mA	0.9 W	120 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Decimator G-String 2N2222A · 2N5551 · LF347 · LF353 ISP Decimator G-String	ISP Decimator G-String	Noise Gate	Guitar-Electronics.eu	—	—	€8.75	78
Noise Terminator 2N5551 · LF347 · LF353 · LF353N Decimator G strong II · 1590BB	Decimator G strong II	Noise Gate	PCB Guitar Mania	1590BB	1	€11.90 out	80
Fuzz Standard 2N3904 · 2N5551 · 2SK30A Ibanez No. 59 Standard Fuzz · 125B	Ibanez No. 59 Standard Fuzz	Fuzz	Naegele Audio	125B	4	—	54
The Ocelot 2N5551 Univox Super-Fuzz · 125B	Univox Super-Fuzz	Fuzz	Naegele Audio	125B	4	—	61
ISP Decimator Noise Reduction 2N5551 · ? · LF353 · LF353N ISP Decimator	ISP Decimator	Noise Gate	Revolution Deux	—	1	—	73
Joao Galego Decimator G-String work-alike 2N5551 · ? · LF353 · LF353N ISP Decimator G-String	ISP Decimator G-String	Noise Gate	Revolution Deux	—	1	—	80