NXP NXP P87C51FB-4N MCU 80C51 8-bit microcontroller 8K, 256 RAM - J22059 Used pull. The NXP P87C51FB-4N is a microcontroller that belongs to the 80C51 family of 8-bit microcontrollers. It is based on the original 80C51 architecture. MSRP: Was: Now: $4.59 Add to Cart