Small signal BJT (Bipolar junction transistor)

Image	Part # & Datasheet	Description	Distributor
	PN2222	General purpose NPN - EBC 30V to 40V, 600 mA to 1 A Complement of PN2907 DIFFERENT PINOUT THAN P2N2222!	Mouser Digikey
"	P2N2222	General purpose NPN - CBE 40V 600 mA DIFFERENT PINOUT THAN PN2222!	Mouser Digikey
"	PN2907	General purpose PNP - EBC 40 V 800 mA Complement of PN2222	Mouser Digikey
"	2N4401	General purpose NPN - EBC 40V 500 mA Complement of 2N4403	Mouser Digikey
"	2N4403	General purpose PNP - EBC 40V 500 mA Complement of 2N4401	Mouser Digikey
"	2N3904	General purpose NPN - EBC 40V 100 mA Complement of 2N3906 Lower noise than many general purpose NPN	Mouser Digikey
"	2N3906	General purpose PNP - EBC 40V 100 mA Complement of 2N3904 Lower noise than many general purpose PNP	Mouser Digikey

Power BJT (Bipolar junction transistor)

Part # & Datasheet	Description	Distributor
TIP120	Common Darlington high-power transistor	Mouser Digikey
ULN2003/2004	7-element common-collector Darlington array ULN2003 has 2.7k input resistors for 5V input voltage ULN2004 has 10.5k input resistors for 6-15V input voltage Output clamp diodes included for driving inductive loads	Mouser Digikey
ULN2803/2804	8-element common-collector Darlington array ULN2803 has 2.7k input resistors for 5V input voltage ULN2804 has 10.5k input resistors for 6-15V input voltage Output clamp diodes included for driving inductive loads	Mouser Digikey

Part # & Datasheet	Description	Distributor
ZVP3306	P-Channel MOSFET General purpose low-power	Digikey
STP16NF06 or STP16NF06:	N-channel Power MOSFET General purpose power FET 60V @ 16A with 90 mOhm Rdson	Digikey Mouser
Vishay IRFD110PBF	N-Channel 100V HEXFET	Digikey Mouser