Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 180-21B ITEM 3 found under Rectifier Semicondu by Hose Mccann Telephone Co Inc. The National Stock Number assigned to this part is 5961013058546, 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 180-21B ITEM 3.