11AA02UIDT-I/SN

Overview

The Microchip Technology 11AA02UIDT-I/SN is a 2 Kbit Serial Electrically Erasable PROM featuring a preprogrammed 32-bit unique ID. It utilizes the UNI/O single I/O serial interface bus with Manchester encoding, supporting a maximum bit rate of 100 kbps. The device operates within a supply voltage range of 1.8V to 5.5V and is organized as 256 x 8 bits. It includes a 16-byte page-write buffer, block write protection, and built-in power-on/off data protection. The component offers high reliability with over 1,000,000 erase/write cycles and data retention exceeding 200 years.

Feature Summary

• Preprogrammed 32-bit unique serial number scalable to other lengths
• Single I/O UNI/O serial interface using Manchester encoding
• Built-in write protection including block protection and power-on/off data protection
• High endurance with one million erase/write cycles and extended data retention

Applications

• Microcontroller system identification
• Secure authentication in embedded devices
• Inventory tracking and serialization
• Configuration storage for single-wire bus systems

Procurement Notes

Verify the specific package suffix against the datasheet. The 'SN' suffix indicates an 8-lead SOIC package, while 'TT' denotes a SOT-23 package. Ensure the temperature grade matches the application requirements, as industrial grades cover -40°C to +85°C. Confirm RoHS compliance status if required by regulatory standards. Cross-reference the full part number with official Microchip documentation to ensure correct pinout and electrical characteristics.

Selection Notes

Select this component when a single-wire interface is required to minimize pin count on the host microcontroller. The UNI/O protocol simplifies PCB layout compared to multi-wire interfaces like SPI or I2C. Choose this device for applications requiring permanent, factory-programmed identification that cannot be altered by end users. Consider the low standby current for battery-powered designs where power conservation is critical during idle periods.

Part Context

The 11AA02UID belongs to Microchip's UNI/O family of serial EEPROMs designed for cost-sensitive and space-constrained applications. Unlike standard EEPROMs, these devices integrate a unique identifier directly into the silicon during manufacturing. This integration eliminates the need for separate security chips or complex software-based identification schemes, streamlining the design process for manufacturers needing robust device tracking capabilities.

Replacement Considerations

Check for 11AA02UID variants with different package suffixes such as TT for SOT-23-3 if footprint changes are acceptable. Verify compatibility with existing firmware drivers, as the UNI/O protocol requires specific timing and state machine handling distinct from I2C or SPI controllers.