The PE42521 from pSemi, A Murata Company is a RF Switch with Frequency 9 KHz to 13 GHz, Insertion Loss 0.6 to 2.6 dB, Isolation 14 to 90 dB, Power 36 dBm (Ip1 dB), Power 3.98 W. Tags: Surface Mount, Solid State. More details for PE42521 can be seen below.