Microsemi (Aliso Viejo, CA) has introduced two new non-magnetic, 500-watt transient voltage suppressor (TVS) arrays. The devices were designed specifically for MRI machines to guard against circuit damage caused by electrostatic discharge, electrical fast transients, and the effects of secondary lighting. The USBQNM504xx and USBQNM504xxC TVS arrays protect uni- and bi-directional lines, respectively. They are offered in a non-ferrous, quad flat no-lead 143- pin metal lead frame. Additional features include peak power rating of 500 watts for an 8/20 microsecond pulse and protection against electrostatic discharge (ESD).