25LC040A-E/ST

Overview

The Microchip Technology 25LC040A-E/ST is a 4 Kbit (512 x 8-bit) Serial Electrically Erasable PROM. It operates within a supply voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz. The device utilizes an SPI-compatible serial bus for data access, featuring a 16-byte page write capability with self-timed erase and write cycles completing in 5 ms maximum. It is housed in an 8-lead TSSOP package and is rated for an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz
• Includes hardware write protection via the WP pin and software block protection for array segments
• Features built-in power-on/off data protection circuitry and a write enable latch
• Provides sequential read operations with automatic address pointer incrementation

Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration value storage
• Device identification information logging

Procurement Notes

Verify that the specific ordering suffix matches the required automotive temperature grade (-40°C to +125°C) and the TSSOP package type. Confirm RoHS compliance status and ensure the selected variant aligns with the necessary voltage operating range of 2.5V to 5.5V for your target application design.

Selection Notes

Select this component when an SPI interface is required for non-volatile memory with automotive-grade thermal stability. Ensure the system voltage remains above 2.5V, as lower voltages are not supported by this specific LC series variant compared to the AA series.

Part Context

This part belongs to the 25XX040A family of 4Kbit Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA040A and 25C040 models but differs in supply voltage requirements and temperature ratings. The 'E' suffix denotes the extended industrial temperature range suitable for demanding environments.

Replacement Considerations

Direct substitutes include other 25LC040A variants with different packages or temperature grades, such as 25LC040A-I/ST for standard industrial use. Cross-family replacements like the 25AA040A require verification of the 1.8V minimum voltage support if applicable.