These are standard To-92 NPN BC547B transistors for general purposes.
This is a good general-purpose transformer for switching.
Very good to prototyping using boards on microcontroller.
Note:
With the flat face of transistor toward you with pins down, the terminals are as follows from left to right: Emitter, Base, Collector. This should be true for all transistors in the TO-92 case.
Parameter:
Type : NPN
Model : BC547B
Package type : TO-92
VCBO: 50V
VCEO: 45V
IC: 0.1A
PC: 500mW
Black Body Size: 4.5mm x 3mm x 4.5mm
Pin Diameter: 0.4mm
Package Content:
20 x NPN Transistors