P4KE8.2CA is a type of Transient Voltage Suppressor (TVS) diode, manufactured by Littelfuse, Inc. It is a bidirectional diode used to protect circuit components from transients such as ESD (electrostatic discharge). It is rated 8.2 volts and can handle up to a maximum of 400 watts peak pulse power rating. The P4KE8.2CA has a maximum clamping voltage of 22.4 volts, and is housed in a DO-204AC, also known as an SMB (9.8mm x 10.2mm), package size. This diode can be used in a variety of applications, including automotive, industrial, and consumer.