NXP P87C51FB-4N 80C51 8-bit Microcontroller MCU 8K ROM 256 RAM Used Pull

NXP P87C51FB-4N 80C51 Microcontroller - Used Pull, 40-Pin DIP

Condition

This NXP P87C51FB-4N ships as a used pull, the single unit shown in the photo. It is a black 40-pin plastic DIP package with the NXP logo, the full P87C51FB-4N part number, and the printed codes CH0611 and TnG0709C legible on the top face. Both rows of leads are present and evenly spaced in the overhead photo, which does not show the lead tips, so lead straightness is not claimed. This is a used pull, sold untested - the photo is the spec for this exact piece.

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Product Overview

The P87C51FB-4N is an NXP (formerly Philips Semiconductors) member of the 80C51 family of 8-bit microcontrollers, built around the original 8051 instruction set and core architecture. Per the manufacturer part designation, it carries 8K of program memory and 256 bytes of RAM. The 87C5x prefix used across this family denotes NXP's OTP (one-time programmable) EPROM based program memory, the way these parts were factory-programmed before flash-based variants took over. It is housed in a 40-pin plastic dual in-line package, the pin count confirmed by the leads visible in the listing photo, with the part number, NXP logo, and CH0611 / TnG0709C lot codes stamped on the lid.

Key Features

• 80C51-core 8-bit microcontroller, 8051 instruction set architecture
• 8K program memory, 256 bytes RAM per manufacturer part designation
• 40-pin plastic DIP package, lead count confirmed from the photo
• NXP logo and full P87C51FB-4N part number legible on the package
• Used pull, sold as the single photographed unit, stock of one

Applications

• Repairing or maintaining legacy industrial control boards originally built around the 80C51/8051 core
• Restoring vintage computing or embedded hobbyist projects that call for a classic 40-pin DIP 8051 variant
• Sourcing a single replacement for a failed P87C51FB-4N without buying a full reel or tray
• Bench prototyping with genuine 80C51 architecture where a socketed DIP part is easier to swap than a surface-mount one

Frequently Asked Questions

What is the NXP P87C51FB-4N?

It is an 8-bit microcontroller in NXP's 80C51 family, built on the classic 8051 core with 8K of program memory and 256 bytes of RAM in a 40-pin DIP package.

What package does this chip use?

A 40-pin plastic dual in-line package (DIP), confirmed by the lead count in the listing photo, matching the pin layout used across the standard 8051/80C51 family.

Will this work as a drop-in replacement in my board?

Not confirmed - verify the exact P87C51FB-4N part number and pinout against your board's datasheet or schematic before use. General 8051-family pin compatibility does not guarantee a match to every design.

What am I actually getting with this used pull?

You're getting the exact chip shown in the photo, pulled from prior service and sold as-is, untested. The printed part number and date/lot codes are legible and match the listing, but function was not verified before listing, so test it in your application before relying on it. Shipping is $8 flat rate, free once your order passes $28, and it leaves our Idaho warehouse the same or next business day.

The 8051 core inside this P87C51FB-4N has been running quiet, unglamorous jobs in control boards for decades, long after flashier chips came and went. If you're keeping one of those boards alive instead of scrapping it, this used pull is ready to go back to work.