Microchip Technology 24AA52-I/P

Overview

24AA52-I/P from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as one 256 × 8-bit block, operating from 1.8V to 5.5V with 400 kHz max clock frequency (100 kHz below 2.2V), 1 mA typical active current, and 1 µA typical standby current. It provides dual write protection-software-based for lower 128 bytes (00h–7Fh) and hardware-based via WP pin for full-array protection-and supports page writes up to 16 bytes.

For engineers reviewing the 24AA52-I/P datasheet, 24AA52-I/P pinout, 24AA52-I/P application, or 24AA52-I/P equivalent, key selection considerations include its industrial temperature range (−40°C to +85°C), Schmitt-trigger inputs for noise immunity, slope-controlled outputs to suppress ground bounce, and compatibility with standard I²C bus timing requirements across voltage variants.

Technical Context

The 24AA52-I/P implements a standard two-wire I²C slave interface with fixed 7-bit address prefix '1010' and three programmable chip-select bits (A0–A2), enabling up to eight devices on a shared bus. Its internal architecture includes an address pointer, page buffer, HV generator for EEPROM programming, and dedicated write-protect logic that enforces hardware-level lockout when WP = VCC regardless of software fuse state.

It features self-timed byte and page write cycles (max 5 ms), acknowledge polling for write completion detection, and built-in VCC threshold detection disabling write operations below 1.5V. Memory endurance is rated at 1,000,000 erase/write cycles with >200 years data retention, validated at 25°C and 5.0V.

Key Specifications

Pinout & Package

24AA52-I/P is supplied in an 8-lead PDIP (Plastic Dual In-line Package) with 0.300-inch body width, lead finish Matte Tin (Pb-free), and standard through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise layout from top view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC52-I/P, the 24AA52-I/P adds 1.8V operation and retains identical industrial temp rating and dual write protection; versus AT24C02C-PU, it trades 1 MHz speed and 1.7V minimum for guaranteed hardware WP pin and proven legacy compatibility in cost-sensitive industrial controls.

Availability

24AA52-I/P is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, smart sensor modules, and consumer appliance control systems requiring stable component supply across extended product lifecycles.

Supply support for 24AA52-I/P 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, manufacturing, and sales operations.

The 24AAxx family was designed specifically for reliable, low-power nonvolatile data storage in resource-constrained embedded systems where I²C simplicity, voltage flexibility, and hardware-level data integrity are critical.

FAQ

What is the maximum I²C clock frequency supported by the 24AA52-I/P?

The 24AA52-I/P supports up to 400 kHz I²C clock frequency when VCC is 2.2V or higher. Below 2.2V (down to 1.8V), the maximum clock frequency is reduced to 100 kHz to ensure reliable timing margins. This dual-speed behavior is explicitly defined in the device's AC specifications and must be observed in firmware clock configuration.

How does hardware write protection work on the 24AA52-I/P?

Hardware write protection on the 24AA52-I/P is controlled by the WP pin: when tied to VCC, the entire 256-byte memory array becomes read-only, overriding any software write-protect setting. When WP is tied to VSS, protection is determined solely by the software fuse. This dual-layer scheme ensures fail-safe data integrity in safety-critical applications.

Can the 24AA52-I/P be used in a 1.8V system?

Yes, the 24AA52-I/P is fully specified for operation from 1.8V to 5.5V, including all DC and AC parameters, I²C timing, and write functionality. Its low-voltage design enables direct integration into battery-powered or energy-efficient systems without level translation, unlike the 24LC52-I/P which requires ≥2.2V.

What is the purpose of the A0, A1, and A2 pins on the 24AA52-I/P?

The A0, A1, and A2 pins on the 24AA52-I/P configure the device's 3-bit hardware address portion of the 7-bit I²C slave address (1010 A2 A1 A0 R/W). By connecting each to VSS or VCC, up to eight 24AA52-I/P devices can share the same I²C bus without address conflict, enabling scalable memory expansion.

Does the 24AA52-I/P support page write operations, and what is the page size?

Yes, the 24AA52-I/P supports page write operations with a 16-byte page buffer. Each page write can transfer up to 16 bytes in a single I²C transaction, provided all addresses fall within the same physical page boundary (00h–0Fh, 10h–1Fh, etc.). Crossing page boundaries causes wraparound, not sequential addressing.