Microchip Technology 24AA512-I/MF

Overview

24AA512-I/MF 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 1 µA max standby current. It supports page writes up to 128 bytes and hardware write-protection via the WP pin for embedded system configuration storage.

For engineers reviewing the 24AA512-I/MF datasheet, 24AA512-I/MF pinout, 24AA512-I/MF application, or 24AA512-I/MF equivalent, key selection criteria include low-voltage operation down to 1.7V, I²C clock compatibility up to 400 kHz, 128-byte page buffer size, hardware write-protect functionality, and industrial-grade reliability with >1 million erase/write cycles and >200 years data retention.

Technical Context

The 24AA512-I/MF implements a two-wire I²C interface with Schmitt-trigger inputs on SDA and SCL for noise immunity, slope control on outputs to suppress ground bounce, and cascading support for up to eight devices on one bus using A0–A2 address pins. Its internal architecture includes a 128-byte page latch, HV generator for EEPROM programming, and memory control logic managing sequential/random reads across the full 512 Kbit address space.

It uses a self-timed erase/write cycle with 5 ms maximum page write time, supports acknowledge polling to detect write completion, and enforces hardware write protection when WP is tied to VCC - all while maintaining strict I²C timing compliance at 1.7V–5.5V supply, including THD:STA ≥600 ns and TAA ≤900 ns under 2.5V–5.5V conditions.

Key Specifications

Pinout & Package

The 24AA512-I/MF is packaged in an 8-lead MicroLead Frame (MF) package - a compact, lead-free, surface-mount variant of SOIC with gull-wing leads and 1.27 mm pitch. This package meets RoHS requirements and supports automated reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC512-I/MF and AT24C512BN-SH-B, the 24AA512-I/MF uniquely delivers 1.7V operation in the MF package without sacrificing industrial temperature rating or write-protection integrity - making it optimal for mixed-voltage embedded systems needing drop-in EEPROM upgrade paths.

Availability

24AA512-I/MF is available at Aetrix Electronics and suitable for smart metering, industrial PLC configuration, automotive body control modules, and medical diagnostic equipment requiring stable component supply across extended production lifecycles.

Supply support for 24AA512-I/MF 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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA512 belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power, and high-reliability nonvolatile storage in industrial, automotive, and consumer applications.

FAQ

What is the minimum supply voltage required for reliable operation of the 24AA512-I/MF?

The 24AA512-I/MF operates reliably down to 1.7V across its full industrial temperature range (−40°C to +85°C). Below 2.5V, I²C clock frequency is limited to 100 kHz per Microchip DS20001754Q specification. This enables direct integration with 1.8V microcontrollers without level shifters, reducing BOM count and board area in battery-powered designs. The 24AA512-I/MF maintains full functionality-including page writes, hardware write protection, and acknowledge polling-at 1.7V.

How does the WP pin function on the 24AA512-I/MF, and when is it sampled?

The WP (Write-Protect) pin on the 24AA512-I/MF is sampled at the Stop bit of each write command. When tied to VCC, it disables all write operations (byte and page) while allowing unrestricted reads; when tied to VSS, writes are fully enabled. The 24AA512-I/MF acknowledges write commands even with WP = VCC, but no data is written to the EEPROM array. This behavior allows software to detect protection status via ACK polling and avoids bus contention during protected states.

What is the maximum number of 24AA512-I/MF devices that can be connected on a single I²C bus, and how is addressing managed?

Up to eight 24AA512-I/MF devices can share one I²C bus using the A0, A1, and A2 address pins. These three pins form the least significant bits of the 7-bit I²C client address (with fixed prefix 1010b), enabling unique addresses from 0x50 to 0x57. Each device must have a distinct combination of A0–A2 tied to VSS or VCC; floating these pins is not permitted. The 24AA512-I/MF does not support dynamic address reconfiguration - address is static and determined at power-on.

Does the 24AA512-I/MF support sequential reads across the entire 512 Kbit memory space?

Yes, the 24AA512-I/MF supports uninterrupted sequential reads across the full 64K-word address space (0x0000 to 0xFFFF). After issuing a Start condition and valid read control byte, the device transmits data starting at the current address pointer and auto-increments the pointer after each byte. Upon reaching address 0xFFFF, the pointer rolls over to 0x0000, enabling continuous streaming without host intervention. This capability is confirmed in DS20001754Q-page 12 Figure 8-3 and applies identically to the 24AA512-I/MF variant.

What is the typical write cycle time for a full 128-byte page on the 24AA512-I/MF?

The 24AA512-I/MF has a maximum page write time of 5 ms, as specified in Table 1-1 and Figure 1-1 of DS20001754Q. This value is guaranteed across the full industrial temperature range and supply voltage (1.7–5.5V). Actual typical write time is shorter, but system firmware must allow up to 5 ms before initiating acknowledge polling or subsequent bus transactions. Page writes are self-timed and do not require clock stretching - the device releases the SDA line after completion, enabling standard I²C protocol recovery.