NM27C256Q200

Memory IC Overview

The NM27C256Q200 is a 256K-bit (32K x 8) high-performance CMOS EPROM manufactured by onsemi. It features parallel interface access with a maximum access time of 200 ns. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports through-hole mounting in a 28-CDIP package with a window for UV erasure. It is designed for non-volatile memory applications requiring reliable data retention.

Memory IC Feature Summary

• High-performance CMOS technology for efficient operation
• Parallel interface architecture for direct system integration
• UV-erasable window enabling reprogrammability
• Through-hole 28-CDIP packaging for robust mechanical stability

Memory IC Applications

• Industrial control systems requiring persistent storage
• Embedded firmware storage in legacy hardware
• Automotive electronic modules needing non-volatile configuration data
• Test equipment calibration data retention

Memory IC Procurement Notes

Verify the component status as discontinued or obsolete before procurement planning. Confirm the presence of the UV window on the package for field erasure capabilities if required. Ensure compatibility with existing 28-CDIP sockets and programming equipment. Check for RoHS compliance status given the vintage of the technology. Validate supply chain availability through authorized distributors or surplus channels.

Memory IC Selection Notes

Select this component when a 32K x 8 parallel EEPROM alternative is needed for legacy designs. Consider the 200 ns access speed against system timing requirements. Evaluate the 28-CDIP windowed package constraints for PCB layout and enclosure design. Assess the 4.5 V to 5.5 V operating range against available power rails. Compare against newer serial EEPROMs if space or pin count reduction is a priority.

Memory IC Part Context

This part belongs to the NM27C256 series of high-performance CMOS EPROMs. It shares architectural similarities with other devices in the 27C256 family but is specifically branded and specified by onsemi. The series targets applications requiring cost-effective, reprogrammable non-volatile memory with parallel interface compatibility.

Memory IC Replacement Considerations

Direct replacements include NM27C256QE150, NM27C256QE200, NM27C256QM150, and NM27C256QM200 from various manufacturers such as Texas Instruments and Fairchild. Verify pinout compatibility and access time specifications when substituting.