25LC320AT-E/ST

Overview

The Microchip Technology 25LC320AT-E/ST is a 32-Kbit Serial Electrically Erasable PROM featuring a 4096 x 8-bit organization. It operates on an SPI-compatible serial bus with a maximum clock frequency of 10 MHz at VCC voltages between 4.5V and 5.5V, reducing to 5 MHz at 2.5V to 4.5V. The device supports a supply voltage range of 2.5V to 5.5V and includes a 32-byte page size for write operations. 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 functions within an extended temperature range of -40°C to +125°C.

Feature Summary

• Supports sequential read operations and self-timed erase/write cycles up to 5 ms maximum duration.
• Includes built-in hardware write protection via the WP pin and software control through the STATUS register block protection bits.
• Features a HOLD input that allows suspension of serial communication without resetting the sequence or requiring retransmission.

Applications

• Data storage in microcontroller systems utilizing SPI interfaces
• Configuration memory for embedded devices
• Parameter storage in industrial instrumentation

Procurement Notes

Verify the specific ordering suffix 'T' indicates tape and reel packaging rather than tube. Confirm the 'E' suffix corresponds to the extended temperature grade (-40°C to +125°C) required for your application environment. Ensure the voltage supply matches the 2.5V to 5.5V operational range specified for the LC series.

Selection Notes

Select this part when an SPI interface is available and extended temperature operation is necessary. The 25LC320A series requires a minimum supply voltage of 2.5V, unlike the AA series which supports lower voltages. Consider the TSSOP package dimensions if board space is constrained compared to SOIC or PDIP options.

Part Context

This component belongs to the 25XX320A family of 32-Kbit Serial EEPROMs manufactured by Microchip Technology. The family shares identical functional specifications but varies by voltage range (AA vs. LC), temperature grade (I vs. E), and physical packaging (MSOP, PDIP, SOIC, TDFN, TSSOP). The 'T' suffix specifically denotes tape and reel packaging suitable for automated assembly.

Replacement Considerations

Direct substitutes include other 25LC320A variants with different packages such as 25LC320A-I/SN or 25LC320A-E/MS, provided the temperature and voltage requirements are met. Cross-vendor replacements like the CAV25320VE-GT3 offer similar capacity and interface but may require verification of electrical characteristics and pin compatibility.