Found 3 alternatives for PE45450A-X by pSemi. Rf Misc Ics And Modules — 12-UFQFN Exposed Pad.
ULTRACMOS POWER LIMITER 10 MHZ-6
RF POWER LIMITER 2GHZ 50W 12QFN
RF DTC 100MHZ-3GHZ 12QFN