Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BT 151-500R found under Semiconductor Device Thyristor by Vishay Ltd. The National Stock Number assigned to this part is 5961013393273, 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 BT 151-500R.