Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number IN5253B found under Semiconductor Devic by Freescale Semiconductor. The National Stock Number assigned to this part is 5961006000689, 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 IN5253B.