The SMBJ30A is a unidirectional transil diode, manufactured by ON Semiconductor. It has a peak pulse power rating of 600 Watts, a peak surge current rating of 100 Amps, and a breakdown voltage of 35V. It is suitable for applications such as transient and ESD protection, EMI/RFI filter, high voltage clamping, switching and Vcc voltage clamping, and lightning protection. Its high surge capability and low forward voltage drop make it ideal for use in a variety of applications.