SKY135XX RF Switch ICs Skyworks Solutions Inc. SKY135XX RF Switch ICs have low insertion loss and high isolation along all switching paths. The SKY135XX are housed in small 1.1mm x 1.1mm, 1.6mm x 1.6mm, or 2mm x 2mm packages and are surface-mount devices for easy assembly. Skyworks SKY135XX RF Switch ICs are ideal for GSM/DCS/PCS/CDMA/WCDMA/TD-SCDMA single-ended filter switching, 2G/3G/4G multimode cellular tablets, handsets, and embedded data cards.