1.2SC5507-T2-A is an NPN transistor manufactured by Renesas Electronics, a Japanese semiconductor company. It is mainly used for low frequency and small load switching applications. It features a low collector-emitter saturation voltage, a built-in resistor to suppress surge, and a built-in diode to protect the transistor and/or external circuits. It also has a high gain current transfer ratio, making it ideal for use in switching applications. It is available in a variety of packages including TO-220 and SOT-23. The T2 is a high voltage version of 2SC5507 and has improved EMI characteristics due to the built-in resistor.