Microchip Technology 24AA02T-I/LT

Overview

24AA02T-I/LT from Microchip Technology is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory with hardware write-protection, 1.7V–5.5V operation, 400 kHz max clock frequency, and industrial temperature range (–40°C to +85°C). It supports byte and 8-byte page writes, features Schmitt-trigger inputs and slope-controlled outputs, and is commonly used for storing calibration data, MAC addresses, and configuration parameters in embedded control modules.

For engineers reviewing the 24AA02T-I/LT datasheet, 24AA02T-I/LT pinout, 24AA02T-I/LT application, or 24AA02T-I/LT equivalent, key selection considerations include its SC-70-5 package footprint, VCC-dependent I²C timing compliance (100 kHz below 2.5V), WP pin logic-level write protection, and compatibility with standard two-wire bus protocols in space-constrained industrial and automotive subsystems.

Technical Context

The 24AA02T-I/LT implements a two-wire I²C interface with fixed 7-bit device address (1010xxx) and R/W bit control, supporting current-address, random, and sequential read modes. Its internal Address Pointer auto-increments after each access, enabling efficient block reads without repeated addressing.

It uses on-chip high-voltage generation for EEPROM programming, includes an 8-byte page write buffer with self-timed erase/write cycles (≤5 ms), and incorporates noise suppression via Schmitt-trigger inputs and input filtering (50 ns spike suppression) - all operating within 1 µA standby and 1 mA active current at 5.5V.

Key Specifications

Pinout & Package

24AA02T-I/LT is packaged in a 5-lead SC-70 (Microchip package code LT), measuring 2.00 mm × 1.25 mm × 0.80 mm (L×W×H), with gull-wing leads and pin 1 marked by a beveled corner. The package is RoHS-compliant and qualified for reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 24LC02B-I/LT, the 24AA02T-I/LT enables lower-voltage operation critical for battery-powered devices, while AT24C02C-SSHM-T offers faster 1 MHz capability and broader automotive qualification - making the 24AA02T-I/LT optimal for cost-sensitive, 1.8V–5.5V industrial control applications where 400 kHz bandwidth suffices.

Availability

24AA02T-I/LT is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU identity storage, network equipment MAC management, and medical device parameter retention requiring stable component supply across multi-year production cycles.

Supply support for 24AA02T-I/LT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA02T-I/LT belongs to Microchip's 24XX02 family of I²C EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in space-constrained embedded systems requiring industrial-grade temperature performance and simple two-wire integration.

FAQ

What is the maximum I²C clock frequency supported by the 24AA02T-I/LT?

The 24AA02T-I/LT supports up to 400 kHz when VCC is ≥2.5V; at 1.7V–2.49V, maximum clock frequency is reduced to 100 kHz. This voltage-dependent timing behavior is defined in Microchip's DS20001709N specification and must be accounted for in firmware clock configuration and pull-up resistor selection to ensure reliable ACK detection and data setup/hold compliance.

Does the 24AA02T-I/LT require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA02T-I/LT requires external pull-up resistors on both SDA and SCL because its I/O pins are open-drain. Recommended values are 10 kΩ for 100 kHz operation, 2 kΩ for 400 kHz, and ≤1 kΩ for marginal 1 MHz use cases - all referenced to VCC. Proper pull-up strength ensures valid logic levels and meets rise-time specifications (≤300 ns at 5V).

How does the WP pin function on the 24AA02T-I/LT?

The WP (Write-Protect) pin on the 24AA02T-I/LT is a logic-level input: tying it to VCC disables all write operations (including byte and page writes) while preserving full read capability; tying it to VSS enables normal read/write access. This hardware-based protection operates independently of I²C commands and remains active even during power cycling, making it ideal for safeguarding critical configuration data.

Can the 24AA02T-I/LT store a full 48-bit MAC address?

Yes, the 24AA02T-I/LT's 256-byte memory capacity fully accommodates a 48-bit (6-byte) MAC address, with ample remaining space for additional identifiers such as serial numbers or calibration checksums. Microchip also offers factory programming services for pre-loading MAC addresses into the 24AA02T-I/LT, enabling automated test and eliminating post-solder programming steps in high-volume manufacturing.

What is the endurance rating of the 24AA02T-I/LT and how is it validated?

The 24AA02T-I/LT is rated for 1,000,000 erase/write cycles at 25°C and 5.5V, verified through accelerated life testing per JEDEC standards. This endurance applies to both byte and page write modes and is guaranteed across the full industrial temperature range (–40°C to +85°C), ensuring reliable field updates in programmable logic controllers, smart meters, and other long-lifecycle industrial equipment.