Microsemi has announced two non-magnetic TVS (transient voltage suppressor) arrays. The USBQNM504xx and USBQNM504xxC can be used to protect uni- and bi-directional lines respectively. The arrays are designed for MRI (magnetic resonance imaging) machines to guard against circuit damage caused by ESD as defined in IEC 61000-4-2, electrical fast transients as per IEC 61000-4-4, and the effects of secondary lightning. The halogen-free arrays are available in a non-ferrous, QFN 143pin metal lead frame. The RoHS-compliant green enclosure is also pin-for-pin compatible with SOT-143 packages. The arrays feature peak power rating of 500W for an eight or 20µs pulse. They also provide board-level protection for sensitive circuitry including TTL (transistor-transistor logic), CMOS, DRAMs, SRAMs, HCMOS (high-density CMOS), HSIC (high-speed inter chip) microprocessors, and USB and I/O transceivers.
