Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PTF56-21K100BT16 found under Resistor Fixed Film by Vishay Dale Electronics Inc. The National Stock Number assigned to this part is 5905011745369, and the Federal Supply Class is 5905 Resistors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PTF56-21K100BT16.