The SM8S33A with 53.3V 36.7V 33V SMD TVS ROHS is an unidirectional, Surface Mount Device (SMD) Transient Voltage Suppressor (TVS) typically used in mobile phone and other portable device applications. It is designed to protect sensitive components from transient voltage spikes such as electrostatic discharges (ESDs), lightning strikes, electric arcs, or inductive kick backs from relays or motors. The part is manufactured by Bourne, meets RoHS standards, and is able to operate with a nominal working voltage up to 53.3V, maximum surge peak pulse when mounted on an FR4 50mm x 50mm PCB at 36.7V, and working voltage at 33V.