34AA02-E/ST

Overview

The Microchip Technology 34AA02-E/ST is a 2 Kbit (256 x 8) serial EEPROM featuring an I²C-compatible 2-wire interface. It operates on a single supply voltage ranging from 1.7V to 5.5V and supports clock frequencies up to 400 kHz. The device includes permanent and resettable software write-protect capabilities for the lower half of the array, alongside hardware protection via the WP pin. It offers a page write buffer of 16 bytes, typical write cycle time of 5 ms, and data retention exceeding 200 years with over 1 million erase/write cycles.

Feature Summary

• Dual software write-protect modes allowing selective or permanent locking of the lower memory half
• Hardware write-protection capability across the entire array via dedicated control pin
• Integrated noise suppression using Schmitt trigger inputs and output slope control
• Brown-out detection circuitry preventing invalid writes during low voltage conditions

Applications

• Embedded systems requiring non-volatile storage for configuration parameters
• Industrial control units needing reliable data retention under varying power conditions
• Automotive electronics demanding extended temperature range operation

Procurement Notes

Verify that the specific suffix 'E' corresponds to the Automotive temperature grade (-40°C to +125°C) as defined in the official datasheet. Confirm package type matches the ST designation. Ensure compatibility with system voltage levels and bus timing requirements before integration.

Selection Notes

Select this component when application requires robust write protection mechanisms combined with wide voltage tolerance. Consider the automotive temperature rating if operating in harsh environments. Evaluate bus topology constraints regarding cascading limits and address pin configurations.

Part Context

This part belongs to the 34AA02/34LC02 family of 2 Kbit serial EEPROMs manufactured by Microchip Technology. It shares architectural similarities with other devices in the series but differs in electrical specifications and temperature ranges. The family supports various packages including TSSOP and SOIC.

Replacement Considerations

Direct substitutes include the 34AA02-I/ST variant which shares identical electrical characteristics but operates within the Industrial temperature range (-40°C to +85°C). Verify package compatibility and ensure functional equivalence regarding write-protect logic.