NM27C040Q120

Memory IC Overview

The NM27C040Q120 is a 4 Mbit (512 k x 8) EPROM memory integrated circuit manufactured by onsemi. It utilizes a parallel interface and features an access time of 120 ns with an output enable access time of 50 ns. The device operates within a supply voltage range of 5 V and supports a maximum operating temperature of +70 °C. It is housed in a 32-CDIP package and requires a programming voltage of 12.75 V. The component is classified as UV-erasable programmable ROM.

Memory IC Feature Summary

• Non-volatile storage capability using UV-erasable EPROM technology
• Parallel data interface for direct system integration
• Industrial temperature range support up to +70 °C

Memory IC Applications

• Embedded firmware storage in industrial control systems
• Legacy hardware maintenance and replacement
• Microcontroller program memory backup

Memory IC Procurement Notes

Verify component authenticity through authorized distributors due to obsolete status. Confirm RoHS compliance requirements against specific project standards, as the source indicates non-compliance. Ensure the 32-CDIP through-hole package matches the target PCB footprint. Validate that the 12.75 V programming voltage is supported by existing infrastructure if reprogramming is required.

Memory IC Selection Notes

Select this component only when a 4 Mbit capacity and 120 ns access speed are strictly required. The 32-CDIP package necessitates through-hole mounting capabilities. Consider the obsolete product status for long-term supply chain stability. Verify compatibility with 5 V logic levels and UV erasure procedures before implementation.

Memory IC Part Context

This part belongs to the 27C series of EPROMs from onsemi, designed for applications requiring non-volatile memory with UV erasability. It serves as a legacy solution for storing code or data that does not require frequent electrical rewriting. The CDIP package provides robust physical protection for the silicon die.

Memory IC Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Due to the obsolete status and specific UV-erasable nature, direct pin-to-pin replacements may not exist without design modifications.