UltraCMOS^® SP4T RF Switch 50–3000 MHz. The PE423641 is a HaRP™ technology-enhanced reflective SP4T RF switch. It has received AEC-Q100 Grade 2 certification and meets the quality and performance standards that makes it suitable for use in harsh automotive environments. It is designed to cover a wide range of wireless applications from 50 MHz through 3 GHz such as cellular antenna band switching, automotive infotainment and traffic safety applications.