Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AS1A3S10 20MHZ found under Crystal Unit Quartz by Cts Valpey Corporation. The National Stock Number assigned to this part is 5955010904906, and the Federal Supply Class is 5955 Oscillators And Piezoelectric Crystals. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AS1A3S10 20MHZ.