Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SYL3449 found under Transistor by Sylvania Electric Products Inc. The National Stock Number assigned to this part is 5961008800820, 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 SYL3449.