25LC320AXT-E/ST

Overview

The Microchip Technology 25LC320AXT-E/ST is a 32-Kbit Serial Electrically Erasable PROM featuring a 4096 x 8-bit organization. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz at higher voltages, reducing to 5 MHz between 2.5V and 4.5V. The device utilizes an SPI-compatible interface with separate data in (SI) and out (SO) lines. It offers high reliability with over 1 million erase/write cycles and data retention exceeding 200 years. The component is housed in an 8-lead TSSOP package and is qualified for extended temperature ranges from -40°C to +125°C.

Feature Summary

• Supports sequential read operations and page writes up to 32 bytes within a single physical page boundary.
• Includes built-in write protection mechanisms such as power-on/off data protection, a write enable latch, and a dedicated write-protect pin.
• Features a Hold input that allows suspension of serial communication without resetting the sequence or requiring retransmission.

Applications

• Data storage in microcontroller systems via direct SPI port interfacing
• Configuration memory for embedded devices requiring non-volatile parameter retention
• Industrial control applications operating within extended temperature environments

Procurement Notes

Verify the specific ordering suffix 'XT' against official Microchip documentation to confirm tape-and-reel packaging and any distinct electrical or mechanical specifications compared to standard variants. Ensure the Extended temperature grade (E) aligns with system thermal requirements. Cross-reference the full part number with current datasheets to validate RoHS compliance status and package marking details prior to procurement.

Selection Notes

Select this component when an SPI-compatible EEPROM with extended industrial temperature capability (-40°C to +125°C) is required. The 2.5V minimum supply voltage distinguishes it from lower-voltage AA series parts. Consider the 32-byte page size for write efficiency and verify that the 10 MHz clock speed meets system bus timing constraints. Ensure the TSSOP package fits the available PCB footprint.

Part Context

This device belongs to the 25LC320A family of 32-Kbit Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA320A but differs in supply voltage requirements, supporting a 2.5V to 5.5V range compared to the 1.8V to 5.5V range of the AA variant. Both families utilize identical SPI interfaces and pinouts.

Replacement Considerations

The 25LC320A-I/ST serves as a direct replacement for the Industrial temperature grade version. For automotive applications, verify AEC-Q100 qualification requirements against specific project needs. Other packages like SOIC or MSOP may be substituted if pin compatibility and thermal performance are validated.