Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3307HD found under Coupler Digital Data by Synoptics Communications Inc. The National Stock Number assigned to this part is 7025014238320, and the Federal Supply Class is 7025 Adp Input Output And Storage Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3307HD.