The SMBJ170A-E3/52 is a transient voltage suppression diode manufactured by Vishay. This diode is ideal for ESD suppressors and uses a UniDir transZorb structure, which provides protection against voltage transients caused by electrostatic discharge (ESD) events. It is also suitable for use in television sets and other electronic devices. The diode has a voltage rating of 170V, a maximum power rating of 1000W, and a maximum breakover voltage of 5% tolerance. It is designed for dual-directional protection with low operating VBR and low clamping current. It also has low capacitance in comparison to similar devices, providing improved ESD immunity.