The AS219-321LF from Skyworks Solutions is a RF Switch with Frequency 100 MHz to 2.5 GHz, Insertion Loss 0.35 to 0.8 dB, Isolation 14 to 26 dB, P1dB 35 dBm, P1dB 3.16 W. Tags: Surface Mount, Solid State. More details for AS219-321LF can be seen below.