The UM9995 was developed for switching applications in MRI systems that require an ultra low magnetic image. The UM9995 is also excellent for shunt mount applications with good switch performance from VHF and higher. The selection of the proper materials for the package insures the minimum magnetic image required for MRI applications. The performance is achieved using discrete low inductance PIN diodes assembled with special hardware to permit good electrical and mechanical properties The Microsemi UM9995 PIN diode is constructed using a fused-in-glass process, which results in a highly reliable, hermetic package. The process utilizes symmetrical, full faced metallurgical bonds to both surfaces of the silicon chip. This construction greatly minimizes the normal parasite inductance and capacitance found in conventional glass or ceramic packaged diodes, which employ straps, springs, or washers.