Parts · Transistors

BC547A

Si NPN BJT TO-92 TH.4 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
BC547A	110	45 V	100 mA	0.5 W	200 MHz

Used on other boards here

Part	hFE min	Vce	Ic	Pc	fT	Boards
BC546A	110	65 V	100 mA	0.5 W	150 MHz	5
TIS92	100	40 V	400 mA	0.625 W		4
BC107	110	45 V	100 mA	0.3 W	150 MHz	13
BC107A	110	45 V	100 mA	0.3 W	150 MHz	3
BC237	110	45 V	100 mA	0.3 W	150 MHz	1
BC546	110	80 V	100 mA	0.5 W	300 MHz	4
2SC2785	110	50 V	100 mA	0.25 W	150 MHz	2
IT122	100	45 V	50 mA	0.3 W	180 MHz	1

Closest by the numbers

Part	hFE min	Vce	Ic	Pc	fT
BC847A-AU	110	45 V	100 mA	0.33 W
BC550A	110	45 V	100 mA	0.625 W	250 MHz
2SC3331	100	50 V	200 mA	0.5 W	200 MHz
2SC3331R	100	50 V	200 mA	0.5 W	200 MHz
BC267A	110	45 V	1000 mA	0.375 W	150 MHz
2SC5398	120	50 V	100 mA	0.45 W	200 MHz
BC846A-AU	110	65 V	100 mA	0.33 W
BCX19CSM4	100	45 V	500 mA	0.4 W	200 MHz

Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
Aclam The Mocker Vero16×14 Verified BC547A Aclam The Mocker	Aclam The Mocker	Fuzz	Dirtbox Layouts	—	3	—	24
Minotaur Sonic Terrors Fuzz & Burn Vero Verified BC108B · BC547A · BC548C Minotaur Sonic Terrors Fuzz & Burn	Minotaur Sonic Terrors Fuzz & Burn	Distortion	Dirtbox Layouts	—	2	—	26
Aclam The Mocker Perfboard Verified BC547A Aclam The Mocker · 1590B	Aclam The Mocker	Fuzz	Effects Layouts (blog)	1590B	3	—	25
Univox Super Fuzz BC547A Univox Super-Fuzz	Univox Super-Fuzz	Fuzz	Experimentalists Anonymous	—	2	—	20