Thank you for selecting Aerospace Aviation 360 for M221-TR by Solid State Devices Inc under Solid State Relays. We are proud to be an ASAP Semiconductor owned and operated website, a leading distributor of aviation and aerospace part numbers like M221-TR. To help us better understand your parts requirements, please fill out an RFQ form for part number M221-TR with your details, and our customer executive will respond to your RFQ in 15 minutes or less.