27C128-20/UC

Overview

The Microchip Technology 27C128-20/UC is a CMOS electrically erasable programmable read-only memory (EEPROM) device. It offers a storage capacity of 128K bits, organized as 16K words by 8 bits. The component features a maximum access time of 200 ns and operates on a single 5 V power supply. It utilizes parallel I/O interfaces with three-state outputs for efficient data transfer. The unit is housed in a ceramic dual in-line package (CDIP) with 28 terminals, designed for reliable performance across an industrial temperature range from -40 °C to +85 °C.

Feature Summary

• Electrically erasable non-volatile memory architecture allowing data retention without power
• High-speed parallel interface supporting asynchronous read operations
• Robust ceramic packaging suitable for demanding industrial environments

Applications

• Industrial control systems requiring persistent configuration storage
• Embedded firmware storage in microcontroller-based applications
• Data logging devices needing reliable long-term information retention

Procurement Notes

Verify the specific suffix UC against official Microchip documentation to confirm package type and environmental ratings. Ensure compatibility with existing programming equipment for EEPROM operations. Confirm that the ceramic DIP form factor fits the target PCB footprint and thermal requirements. Cross-reference the manufacturer's latest datasheet for any updates on pinout or electrical characteristics before finalizing procurement.

Selection Notes

Select this component when a robust, electrically erasable memory solution is required for industrial applications. The 200 ns access speed suits moderate-frequency digital systems. The ceramic package provides superior durability compared to plastic variants. Consider the 128K bit density for storing firmware or fixed data tables. Ensure the system design supports the necessary 5 V logic levels and programming voltages.

Part Context

This part belongs to the standard 27C series of EPROM/EEPROM devices widely used in legacy and industrial electronics. Microchip Technology continues production of these components to support maintenance and long-life manufacturing cycles. The 27C128 variant represents a common density level for general-purpose memory storage needs in embedded systems.

Replacement Considerations

Direct replacements include other 27C128 variants from different manufacturers such as Intel or AMD, provided pinouts and electrical specifications match. Verify that substitute parts maintain the same 200 ns access time and 5 V operating voltage. Check package compatibility if switching between ceramic and plastic DIP options.