34AA02-I/ST

Overview

The Microchip Technology 34AA02-I/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 utilizes low-power CMOS technology with typical standby current of 100 nA and active read current of 1 mA. The component offers over one million erase/write cycles and data retention exceeding 200 years.

Feature Summary

• Features dual software write-protect modes allowing selective or permanent locking of the lower memory half
• Includes hardware write-protection capability through the dedicated WP pin to secure the entire array
• Supports cascading up to eight devices on a single bus using chip select address pins
• Incorporates Schmitt trigger inputs and output slope control to suppress noise and eliminate ground bounce

Applications

• Embedded systems requiring non-volatile storage for configuration parameters
• Industrial control applications needing reliable data retention in noisy environments
• Consumer electronics utilizing low-voltage power supplies
• Automotive modules operating within extended temperature ranges

Procurement Notes

Verify that the ordering suffix matches the required package type, as the 34AA02 series is available in multiple formats including TSSOP, SOIC, PDIP, MSOP, and TDFN. Confirm the temperature grade corresponds to the industrial specification (-40°C to +85°C). Ensure compatibility with the system's I²C bus voltage levels and pull-up resistor requirements before finalizing procurement.

Selection Notes

Select this component when a small capacity non-volatile memory is needed with flexible write-protection options. The wide voltage range down to 1.7V makes it suitable for battery-powered designs. Consider the page write buffer size if high-speed sequential writes are required. Verify that the physical package dimensions fit the PCB layout constraints compared to other available packages in the same family.

Part Context

This part belongs to the 34XX02 family of serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 34LC02 but differs in minimum operating voltage specifications. The device is designed to replace legacy parallel EEPROMs in space-constrained applications while maintaining standard I²C protocol compatibility.

Replacement Considerations

Direct substitutes include other 2Kb I²C EEPROMs from various manufacturers, provided they match the voltage range and pinout. Cross-referencing with the 34LC02 requires verifying the minimum supply voltage difference. Ensure any replacement maintains the same package footprint and thermal characteristics.