25LC320A-H/SN

Overview

The Microchip Technology 25LC320A-H/SN is a mid-density serial electrically erasable programmable read-only memory (EEPROM) with a storage capacity of 32 Kbit, organized as 4,096 x 8 bits. It operates on a Serial Peripheral Interface (SPI) compatible bus architecture and supports a maximum clock frequency of 5 MHz when supplied between 4.5 V and 5.5 V, or 3 MHz between 2.5 V and 4.5 V. The device functions within an extended temperature range of -40°C to +150°C and utilizes an 8-lead plastic small outline (SOIC) package.

Feature Summary

• Supports block-level write protection allowing selection of none, one-quarter, one-half, or all array segments for data security.
• Includes built-in power-on/off data protection circuitry and a write enable latch to prevent inadvertent writes.
• Features a hold pin that suspends serial communication without resetting the sequence, enabling host interrupt servicing.

Applications

• Industrial control systems requiring high-temperature reliability
• Automotive electronics operating under extreme thermal conditions
• Data logging applications needing long-term nonvolatile retention

Procurement Notes

Verify the specific suffix 'H' confirms the extended temperature grade (-40°C to +150°C) and 'SN' denotes the 8-lead SOIC package. Confirm RoHS compliance status and ensure the design accounts for the 6 ms maximum internal write cycle time during system initialization sequences.

Selection Notes

Select this component when designs require operation at temperatures exceeding standard industrial limits up to 150°C. Ensure the system voltage remains within the 2.5 V to 5.5 V range and that the SPI controller supports the required 5 MHz clock speed at higher supply voltages.

Part Context

This device belongs to the 25LCXXX family of mid-density serial EEPROMs from Microchip Technology. It shares architectural similarities with other densities in the series but is specifically optimized for 32 Kbit capacity. The part integrates high-reliability PMOS technology designed for robust performance in demanding environments.

Replacement Considerations

Direct replacements include other 25LC320A variants with different temperature grades or packages, such as 25LC320A-I/SN for industrial ranges. Cross-vendor equivalents must match SPI interface, voltage range, and physical footprint constraints.