25C040T-E/SN

Memory IC Overview

The Microchip Technology 25C040T-E/SN is a 4 Kbit (512 x 8) serial Electrically Erasable PROM. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum clock frequency of 3 MHz via an SPI-compatible interface. The device features automotive-grade reliability with an extended temperature range from -40 °C to +125 °C. It is housed in an 8-lead Plastic Small Outline (SOIC) package and supplied in tape and reel format.

Memory IC Feature Summary

• Supports Serial Peripheral Interface (SPI) compatible communication with separate data input and output lines.
• Includes hardware write protection via the WP pin and software block protection for array segments.
• Features self-timed erase and write cycles with internal write enable latch management.

Memory IC Applications

• Automotive electronic systems requiring high-temperature endurance
• Industrial control applications needing non-volatile data storage
• Microcontroller-based systems utilizing SPI bus interfaces

Memory IC Procurement Notes

Verify that the ordering suffix 'T' corresponds to the tape and reel packaging configuration. Confirm the 'E' suffix indicates the automotive temperature grade (-40 °C to +125 °C). Ensure the 'SN' suffix matches the required 8-lead SOIC package dimensions. Cross-reference the specific part number against the manufacturer's current datasheet to confirm active status and compliance details.

Memory IC Selection Notes

Select this component when a 5V-only supply system requires SPI EEPROM storage with automotive-grade thermal stability. The 4 Kbit capacity suits applications storing small configuration sets or calibration data. Verify that the 3 MHz clock speed meets the system's timing requirements and that the SOIC package fits the available PCB footprint.

Memory IC Part Context

This device belongs to the 25XX040 family, which includes variants supporting different voltage ranges and industrial grades. The 25C040 specifically targets 5V applications, distinguishing it from lower-voltage counterparts like the 25LC040. The 'T' suffix denotes tape and reel packaging, while 'E' specifies the extended automotive temperature range.

Memory IC Replacement Considerations

Consider the 25C040-I/SN for industrial temperature range applications (-40 °C to +85 °C). For alternative packaging, evaluate the 25C040T-E/ST (TSSOP) or 25C040T-E/P (PDIP). Note that newer designs may utilize the 25AA040A or 25LC040A series as recommended replacements.

Memory IC FAQ

What is the function of the HOLD pin?

The HOLD pin suspends serial communication without resetting the sequence, allowing the host to service higher priority interrupts while keeping the device selected.

How does the write-protect pin operate?

When the WP pin is low, all writes to the array and STATUS register are disabled. When high, normal operations including nonvolatile writes proceed.