25CSM04T-I/SN

Overview

The Microchip Technology 25CSM04T-I/SN is a 4-Mbit (512 K x 8) SPI Serial EEPROM housed in an 8-lead SOIC package. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 8 MHz at VCC ≥ 3.0V, or 5 MHz at VCC ≥ 2.5V. The device features a page size of 256 bytes, self-timed write cycles with a maximum duration of 5 ms, and standby current as low as 1.0 µA at 2.5V. It includes built-in ECC logic for data integrity and operates across the industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrated Security Register containing a factory-programmed 128-bit serial number and a user-programmable lockable ID page.
• Configurable Enhanced Write Protection Mode allowing independent segmentation of memory into partitions with unique protection behaviors.
• Built-in Error Correction Code (ECC) logic capable of correcting single-bit errors within four-byte read sequences.
• JEDEC-compliant Identification Register supporting electronic querying of Manufacturer ID, Device ID, and Extended Device Information.

Applications

• Consumer electronics requiring reliable nonvolatile memory storage
• Industrial applications demanding dependable data retention
• Systems requiring product serialization without manual manufacturing steps

Procurement Notes

Verify that the specific ordering suffix 'I/SN' corresponds to the Industrial temperature grade (-40°C to +85°C) and the 8-Lead SOIC package type. Confirm that the required voltage operation aligns with the specified 2.5V to 5.5V range. Ensure the application design accounts for the SPI interface timing requirements, particularly regarding clock frequency limits at different supply voltages.

Selection Notes

Select this component when a 4-Mbit capacity is required alongside advanced security features such as a unique serial number. It is suitable for designs needing flexible write protection schemes beyond simple block locking. Consider this part if the system benefits from hardware-level error correction to enhance data reliability without external processing overhead.

Part Context

This device belongs to the 25CSM series of SPI Serial EEPROMs manufactured by Microchip Technology. The series is optimized for consumer and industrial markets where robust nonvolatile storage is critical. The 25CSM04 specifically provides 4 Mbits of organization, distinguishing it from smaller capacity variants like the 25CSM01 or larger ones like the 25CSM16.

Replacement Considerations

Direct replacements must match the 4-Mbit SPI EEPROM specification, 8-lead SOIC package, and Industrial temperature range. Verify compatibility with Legacy or Enhanced Write Protection modes if existing firmware relies on specific partition configurations.