N87C251SA16

Microcontrollers Overview

The N87C251SA16 is an 8-bit microcontroller IC based on the MCS-51 architecture, manufactured by Intel/Altera. It features a maximum operating speed of 16 MHz and includes 8 KB (8K x 8) of One-Time Programmable (OTP) memory for code storage. The device is housed in a 44-pin PLCC package and provides 32 GPIO ports for general-purpose input and output applications. It operates within a standard commercial temperature range of 0°C to +70°C.

Microcontrollers Feature Summary

• Integrates an 8-bit MCS-51 compatible CPU core with 16 MHz processing capability
• Includes 8 KB of OTP memory for embedded program storage
• Provides 32 general-purpose I/O lines for peripheral interfacing

Microcontrollers Applications

• Embedded control systems requiring 8-bit processing
• Industrial automation interfaces
• Consumer electronics logic controllers

Microcontrollers Procurement Notes

Verify the specific ordering suffix and voltage variants when sourcing this component, as availability may vary between original manufacturer stock and third-party distributors. Confirm that the OTP nature of the memory aligns with your production volume requirements, as reprogramming is not possible after fabrication. Ensure compatibility with your target PCB footprint and thermal management specifications.

Microcontrollers Selection Notes

Select this component for designs necessitating a legacy 8-bit architecture with integrated OTP storage to reduce bill of materials complexity. Consider the 44-pin PLCC package constraints for board layout and ensure the 16 MHz clock speed meets the real-time processing demands of the application. Evaluate the 0°C to +70°C operating range against environmental conditions.

Microcontrollers Part Context

This microcontroller belongs to the historical MCS-51 family produced under the Altera brand following Intel's semiconductor division transitions. It represents a bridge component often found in established industrial designs where legacy codebases and hardware interfaces are maintained. The part is distinct from modern FPGA offerings typically associated with the Altera name.

Microcontrollers Replacement Considerations

Direct pin-to-pin replacements may be limited due to the specific OTP configuration and vintage manufacturing status. Verify functional equivalents from other manufacturers offering 8051-compatible cores with similar memory sizes and package dimensions.