The STMicroelectronics STR1550 is an NPN bipolar junction transistor designed for general-purpose applications. It offers a 500V collector-emitter voltage and a 500mA collector current.
The MMBT3906 is a PNP bipolar transistor designed for general purpose switching applications. It offers a collector-emitter voltage of -40V and a continuous collector current of -200mA.
BCW68H-TP is a PNP small signal transistor from Micro Commercial Components. It features a maximum collector-emitter voltage of -45V, continuous collector current of -800mA, and power dissipation of 330mW in a surface-mount SOT-23 package.
The Micro Commercial MMBT3904-TP is an NPN bipolar junction transistor designed for general purpose applications. It offers a 40V breakdown voltage and 200mA continuous collector current.