The BS250 is a P Channel enhancement mode vertical D-MOS transistor manufactured in TO-92 package. The pin configuration of the transistor is as follows: The first pin is Source, second pin is Gate and the third pin is Drain.
The HA17555 is a designed for accurate time delays or oscillations. It provides both of trigger terminal and reset terminal in order to enable a wide scope of application including Mono Multi Vibrator and Astable Multi Vibrator.
The 2SK1794, 2SK-1794, K1794, 1794 is a 900V 6A 100W TO-3P Package, N-Channel Power MOSFET Switching Transistors With Freewheeling Diode And High Power MOSFET.
The Darlington Bipolar Power Transistor is designed for general-purpose amplifier and low speed switching applications. TIP120, TIP121, TIP122 (NPN); TIP125, TIP126, TIP127 (PNP) are complementary devices.