Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number Q19019-1021 found under Semiconductor Devic by Atlantic Inertial Systems Inc. The National Stock Number assigned to this part is 5961008659229, and the Federal Supply Class is 5961 Semiconductor Devices And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like Q19019-1021.