Microchip Technology 24AA02H-I/SN

Overview

24AA02H-I/SN from Microchip Technology is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C), 400 kHz max clock frequency, and hardware write-protect for upper half-array (0x80–0xFF). It enables secure device identification and configuration storage in embedded systems with low-power requirements.

For engineers reviewing the 24AA02H-I/SN datasheet, 24AA02H-I/SN pinout, 24AA02H-I/SN application, or 24AA02H-I/SN equivalent, key selection considerations include its 1.7V minimum VCC, 8-byte page write buffer, Schmitt-trigger I²C inputs, self-timed 5 ms write cycle, and AEC-Q100 qualification for automotive use.

Technical Context

The 24AA02H-I/SN implements a two-wire I²C interface with fixed 7-bit client address (1010xxx) and R/W bit control, supporting byte and page write modes. Its internal Address Pointer auto-increments during sequential reads and random accesses, enabling efficient memory traversal without external address management.

Write protection is implemented via the WP pin: tied to VSS enables full-array writes; tied to VCC locks addresses 0x80–0xFF while permitting reads across the entire 256-byte array. The device uses Schmitt-trigger inputs and output slope control to suppress noise and eliminate ground bounce on shared I²C buses.

Key Specifications

Pinout & Package

24AA02H-I/SN is supplied in an 8-lead narrow SOIC package (SN), 3.90 mm body width, with standard 1.27 mm pitch and JEDEC-compliant footprint. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC02B-I/SN and AT24C02D-SSHM-T, the 24AA02H-I/SN uniquely combines 1.7V operation, AEC-Q100 qualification, and factory-programmable MAC address support - making it the only option for automotive 1.8V microcontroller interfaces requiring certified reliability.

Availability

24AA02H-I/SN is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor nodes, consumer appliance configuration storage, and secure device identity applications requiring stable component supply across extended production lifecycles.

Supply support for 24AA02H-I/SN 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 24AA02H belongs to Microchip's serial EEPROM product line, engineered for secure, low-power, and high-reliability nonvolatile storage in automotive, industrial, and IoT edge devices where data integrity and long-term retention are critical.

FAQ

What is the minimum supply voltage required for reliable operation of the 24AA02H-I/SN?

The 24AA02H-I/SN operates reliably down to 1.7V across its full industrial temperature range (–40°C to +85°C). This allows direct interfacing with 1.8V microcontrollers without level-shifting circuitry. Operation below 1.7V is not guaranteed and may result in incomplete writes or read errors. Always verify VCC stability during I²C transactions per DS20002105B Section 1.0.

Does the 24AA02H-I/SN support page writes, and what is the maximum buffer size?

Yes, the 24AA02H-I/SN supports page writes with an 8-byte buffer. Up to eight consecutive bytes can be loaded into the on-chip buffer and written to memory upon receipt of a Stop condition. Page boundaries align to 8-byte intervals (e.g., 0x00–0x07, 0x08–0x0F); crossing a boundary causes wraparound within the same page. This feature reduces I²C overhead versus individual byte writes.

How does the Write-Protect (WP) pin function on the 24AA02H-I/SN?

When WP is tied to VSS, full-array read/write access is enabled. When WP is tied to VCC, writes to addresses 0x80–0xFF are inhibited while reads remain unrestricted. This hardware lock protects factory-programmed data (e.g., MAC address in upper half) from accidental overwrite. WP state is sampled at the start of each write command and cannot be changed mid-transaction.

Is the 24AA02H-I/SN compatible with standard I²C protocols and clock speeds?

Yes, the 24AA02H-I/SN is fully I²C-compatible with a fixed 7-bit address prefix (1010xxx) and supports standard-mode (100 kHz) and fast-mode (400 kHz) clocking. At VCC ≥ 2.5V, it meets all I²C timing specifications including THD:STA, TSU:DAT, and TAA. Its Schmitt-trigger inputs and slew-rate-controlled outputs ensure robust interoperability with diverse I²C masters.

What packaging and marking information identifies the 24AA02H-I/SN variant?

The 24AA02H-I/SN uses an 8-lead narrow SOIC package (SN) with industrial temperature grade (I). Marking includes "24AA02H" followed by "I/SN" and date code (e.g., "0527" for week 27 of 2005). Per Microchip Drawing C04-057-SN Rev F, it features 1.27 mm pitch, 3.90 mm body width, and JEDEC-standard footprint - verified in DS20002105B pages 18–20.