Replacement Notice: The 85331B 50 GHz PIN diode switch is a complete replacement for the 85331A which was discontinued September 1, 2006. The 85331A will be supported through June 1, 2008. The Agilent 85331B single-pole-double-throw (SP2T) solid state switch maximizes your frequency range from 45 MHz up to 50 GHz, offering excellent performance with high isolation and fast switching speed.