Microchip Technology 24AA512-I/SM

Overview

24AA512-I/SM from Microchip Technology Inc. is a 512 Kbit I²C-compatible serial EEPROM organized as 64K × 8-bit, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C), 400 µA max read current, and hardware write-protect via WP pin - used for nonvolatile parameter storage in embedded controllers, power supplies, and sensor calibration modules.

For engineers reviewing the 24AA512-I/SM datasheet, 24AA512-I/SM pinout, 24AA512-I/SM application, or 24AA512-I/SM equivalent, key selection criteria include its 1.7V low-voltage operation, 128-byte page write buffer, Schmitt-triggered SDA/SCL inputs for noise immunity, and compatibility with 100 kHz / 400 kHz I²C buses across industrial-grade systems.

Technical Context

The 24AA512-I/SM implements a two-wire I²C interface with fixed 4-bit control code (1010b) and 3-bit chip address (A2–A0), enabling up to eight devices on one bus. Its internal address pointer supports current-address, random, and sequential reads across the full 64K address space (0x0000–0xFFFF).

Write operations use self-timed erase/write cycles with 5 ms maximum page write time and automatic address incrementing. The device features an on-chip 128-byte page latch, hardware write-protection via the WP pin, and Schmitt-trigger inputs with 0.05×VCC hysteresis for robust noise suppression on SDA and SCL lines.

Key Specifications

Pinout & Package

24AA512-I/SM is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package with gull-wing leads, JEDEC MS-012AC compliant, body size 3.90 mm × 4.90 mm × 1.75 mm, and matte tin (Sn) lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC512-I/SM and AT24C512BN-SH-B, the 24AA512-I/SM offers lowest-voltage operation (1.7V), consistent WP polarity (active-high), and guaranteed industrial-temperature performance - making it optimal for battery-powered, mixed-voltage, or safety-critical embedded systems requiring robust nonvolatile storage.

Availability

24AA512-I/SM is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power supply configuration, and medical device serial numbering requiring stable component supply across long-lifecycle programs.

Supply support for 24AA512-I/SM 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA512 belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile data storage in industrial, automotive, and medical applications demanding extended data retention and high endurance.

FAQ

What is the minimum operating voltage for the 24AA512-I/SM?

The 24AA512-I/SM operates down to 1.7V, enabling direct integration into 1.8V logic systems without level shifters. This specification is validated across the full industrial temperature range (–40°C to +85°C) and applies to both read and write operations. Below 2.5V, the maximum I²C clock frequency is limited to 100 kHz to ensure timing compliance. The 24AA512-I/SM maintains full functionality-including page write, acknowledge polling, and hardware write-protection-at this minimum voltage.

How does the WP pin function on the 24AA512-I/SM?

The WP (Write-Protect) pin on the 24AA512-I/SM is an active-high hardware lock that disables all write operations (byte and page) when pulled to VCC, while permitting unrestricted reads. It is sampled at the Stop condition of each write command, so toggling WP during an ongoing write cycle has no effect. This feature prevents accidental overwrites during power-up/down transients or firmware errors. The 24AA512-I/SM requires no software initialization to enable WP protection - it is effective immediately upon power stabilization.

What is the maximum page write size supported by the 24AA512-I/SM?

The 24AA512-I/SM supports a maximum page write size of 128 bytes, aligned to physical page boundaries starting at addresses divisible by 128 (e.g., 0x0000, 0x0080, 0x0100). Attempting to write across a page boundary causes wraparound within the current page rather than spanning to the next. Each page write initiates a single self-timed 5 ms erase/write cycle, regardless of the number of bytes written (1–128), and endurance is rated per page. The 24AA512-I/SM's internal page latch holds all 128 bytes until the Stop condition triggers the write.

Can multiple 24AA512-I/SM devices share the same I²C bus?

Yes, up to eight 24AA512-I/SM devices can operate on a single I²C bus using hardware-configurable chip addresses via the A0, A1, and A2 pins. Each device responds only to its unique 7-bit client address (1010xxx), where xxx is the binary value of A2–A0. All devices share the same SDA and SCL lines but require individual pull-up resistors sized for total bus capacitance. The 24AA512-I/SM supports cascaded addressing to extend contiguous memory space up to 4 Mbit across eight units, though sequential reads cannot cross device boundaries.

What is the endurance rating of the 24AA512-I/SM and how is it measured?

The 24AA512-I/SM is rated for 1,000,000 erase/write cycles at 25°C and VCC = 5.5V under page-mode operation. Endurance is specified per physical page (128 bytes), meaning each full-page write consumes one cycle regardless of byte count. Real-world endurance scales linearly with page size usage - writing 16 bytes per cycle yields ~8 million effective operations per page. Data retention remains >200 years after the final write, verified under accelerated life testing per JEDEC standards. The 24AA512-I/SM includes built-in write-cycle status reporting via acknowledge polling to prevent premature rewrites.