25LC320XT-I/ST

Overview

The Microchip Technology 25LC320XT-I/ST is a 32 Kbit serial Electrically Erasable PROM featuring a 4096 x 8 bit organization. It operates within a voltage range of 2.5 V to 5.5 V and supports a maximum clock frequency of 2 MHz. The device utilizes an SPI-compatible interface with SCK, SI, SO, CS, HOLD, and WP pins. It offers high reliability with over 1 million E/W cycles endurance and data retention exceeding 200 years. The component is housed in an 8-pin TSSOP package and is rated for industrial temperature operation from -40 °C to +85 °C.

Feature Summary

• Supports block write protection allowing selection of none, 1/4, 1/2, or all array segments.
• Includes built-in power on/off data protection circuitry and a write enable latch.
• Features a hold pin to suspend transmission without resetting the serial sequence.

Applications

• Microcontroller systems requiring non-volatile data storage
• Industrial control applications
• Embedded devices needing parameter retention

Procurement Notes

Verify the specific suffix 'XT' against official documentation to confirm reel packaging and rotation specifications. Ensure the Industrial temperature grade (-40°C to +85°C) matches system requirements. Confirm the 2.5V minimum operating voltage aligns with the target supply rail. Cross-reference the datasheet revision to ensure compatibility with current design constraints.

Selection Notes

Select this part for applications requiring low-power CMOS technology with standard SPI interfaces. Consider the 32-byte page write capability for efficient data management. Evaluate the 2 MHz maximum clock speed against system timing needs. Verify that the 8-pin TSSOP package fits the available PCB footprint and assembly process.

Part Context

This component belongs to the 25XX320 family of 32 Kbit serial EEPROMs. It shares architectural similarities with the 25AA320 and 25C320 variants but differs in voltage ranges and clock speeds. The 25LC320A series is recommended as a modern replacement for new designs, offering enhanced features while maintaining functional compatibility.

Replacement Considerations

Public confirmed substitute part numbers include 25LC320A-I/ST and 25LC320T-E/SN. Verify voltage and temperature specifications when substituting.