The BC177 and BC177B are silicon planar epitaxial PNP transistors in the TO-18 metal case. They are suitable for use in driver stages, low noise input stages, and signal processing circuits of television receivers.
The 2N4402 is a PNP silicon transistor designed for general purpose amplifier and switching applications. This transistor comes with a VCE of 40V and a continuous collector current of 600mA. It can be used as a small signal switching transistor.
The 2N3703 is a PNP Transistor with VCE of -30V and a collector current of 500mA. It can be used as a small signal switching transistor and any other small-signal application. It also has a low base voltage of -5V.