25LC320A-I/ST

Overview

The Microchip Technology 25LC320A-I/ST is a 32-Kbit (4096 x 8-bit) Serial Electrically Erasable PROM accessed via an SPI-compatible serial bus. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz at 5.5V. The device features a 32-byte page size, self-timed erase/write cycles with a maximum duration of 5 ms, and industrial temperature support from -40°C to +85°C. It utilizes low-power CMOS technology with standby current as low as 5 µA.

Feature Summary

• Supports high-speed serial communication with a maximum clock frequency of 10 MHz.
• Includes built-in write protection mechanisms such as power-on/off data protection and a dedicated write-protect pin.
• Features block write protection allowing selection of none, 1/4, 1/2, or all array segments.
• Provides hardware hold functionality to pause transmission without resetting the serial sequence.

Applications

• Microcontroller systems requiring non-volatile data storage
• Industrial control applications operating in extended temperature ranges
• Embedded systems utilizing SPI interfaces for configuration storage

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range requirements align with the LC series specifications (2.5V minimum). Ensure compatibility with existing SPI bus protocols and check for any recent product change notifications regarding packaging or material composition updates.

Selection Notes

Select this component when a 32-Kbit EEPROM with SPI interface is required for industrial environments. The LC variant specifies a 2.5V minimum supply voltage, distinguishing it from AA variants. Consider the 8-lead TSSOP package for surface-mount assembly needs. Evaluate endurance and retention specifications against long-term reliability requirements.

Part Context

This part belongs to the 25XX320A family of 32-Kbit Serial EEPROMs manufactured by Microchip Technology. The family includes both AA and LC variants, differentiated primarily by their operating voltage ranges. The I designation indicates industrial temperature rating. These devices are designed for direct interfacing with popular microcontroller families supporting standard SPI protocols.

Replacement Considerations

Direct replacements within the same family include other 25LC320A variants with different packages (e.g., MSOP, PDIP, SOIC) or temperature grades (E for Extended). Cross-family substitution requires verifying voltage compatibility and pinout alignment.