Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ECM44B found under Microphone Capacitor by Sony Electronics Inc. The National Stock Number assigned to this part is 5965015197056, and the Federal Supply Class is 5965 Headsets Handsets Microphones And Speakers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like ECM44B.