Microchip Technology 24AA52T-I/MNY

Overview

24AA52T-I/MNY from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as one block of 256 × 8-bit memory, 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 supports software write-protection for lower 128 bytes and hardware write-protection via the WP pin, and is used in embedded system configuration storage where low-voltage operation and dual-layer data integrity are required.

For engineers reviewing the 24AA52T-I/MNY datasheet, 24AA52T-I/MNY pinout, 24AA52T-I/MNY application, or 24AA52T-I/MNY equivalent, key selection considerations include its 1.8V minimum supply, Schmitt-trigger I²C inputs for noise immunity, page-write buffer (up to 16 bytes), 1 million erase/write cycles, and industrial temperature range (–40°C to +85°C).

Technical Context

The 24AA52T-I/MNY implements a standard two-wire I²C slave interface with fixed 7-bit address prefix '1010' and three programmable chip-select bits (A2–A0), enabling up to eight devices on a single bus. Its internal architecture includes an address pointer, page buffer, HV generator for EEPROM programming, and separate software/hardware write-protection logic that operates independently - software protection locks addresses 00h–7Fh permanently once set, while the WP pin globally disables writes regardless of software state.

It features Schmitt-trigger inputs on SDA and SCL with 50 ns spike suppression and hysteresis (0.05 × VCC), slope-controlled outputs to minimize ground bounce, and a self-timed write cycle (5 ms typical) with acknowledge polling support. The device incorporates VCC threshold detection (<1.5V disable) and ESD protection >4 kV, ensuring robust operation in noisy or brown-out-prone environments.

Key Specifications

Pinout & Package

24AA52T-I/MNY is supplied in an 8-lead MNY package - Microchip's designation for 2 mm × 3 mm DFN (Dual Flat No-lead) with exposed pad. This RoHS-compliant, space-efficient surface-mount package supports automated assembly and thermal performance comparable to MSOP/TSSOP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA52T-I/MNY, the 24LC52-I/MNY offers identical functionality above 2.2V but sacrifices 1.8V compatibility, while the AT24C02C-MAHM-T adds speed headroom but removes the software write-protect fuse - making 24AA52T-I/MNY the optimal choice for 1.8V–5.5V systems requiring dual-layer data security.

Availability

24AA52T-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration storage, medical device configuration memory, automotive body control modules, and smart energy meter firmware settings requiring stable component supply, long-term obsolescence management, and RoHS-compliant packaging.

Supply support for 24AA52T-I/MNY 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, founded in 1989 and headquartered in Chandler, Arizona.

The 24AA52T-I/MNY belongs to Microchip's 24AAxx family of I²C serial EEPROMs, designed specifically for low-voltage, low-power embedded systems requiring reliable nonvolatile storage with robust noise immunity and flexible write protection.

FAQ

What is the minimum operating voltage for the 24AA52T-I/MNY?

The 24AA52T-I/MNY operates down to 1.8V across its full industrial temperature range (–40°C to +85°C). Below 2.2V, its maximum I²C clock frequency is reduced to 100 kHz to ensure timing margin and noise immunity. This makes the 24AA52T-I/MNY suitable for direct integration with 1.8V microcontrollers and battery-powered systems where supply voltage may dip during operation.

How does the software write-protection feature work in the 24AA52T-I/MNY?

The 24AA52T-I/MNY software write-protection permanently locks addresses 00h–7Fh (lower 128 bytes) after issuing a specific '0110' control byte command. Once set, this protection cannot be reversed by normal means. The 24AA52T-I/MNY also supports a hardware write-protect pin (WP) that overrides software protection and locks the entire array when pulled high. Both mechanisms operate independently.

Can the 24AA52T-I/MNY be used with a 5V microcontroller I²C bus?

Yes, the 24AA52T-I/MNY supports VCC from 1.8V to 5.5V and is fully compatible with 5V I²C buses. Its SDA and SCL pins feature Schmitt-trigger inputs and are rated for input voltages up to VCC +1.0V, eliminating the need for external level shifters when interfacing with 5V masters. Pull-up resistors should be sized appropriately (e.g., 2.2 kΩ for 400 kHz operation).

What package type does the 24AA52T-I/MNY use, and what are its key mechanical features?

The 24AA52T-I/MNY uses Microchip's MNY package: an 8-lead, 2 mm × 3 mm DFN (dual flat no-lead) with exposed thermal pad. The exposed pad (Pin 5) must be soldered to a VSS plane for optimal thermal dissipation and electrical stability. This package is RoHS-compliant, halogen-free, and optimized for high-density PCB layouts in space-constrained applications.

Does the 24AA52T-I/MNY support page write operations, and what is the buffer size?

Yes, the 24AA52T-I/MNY supports page write operations with a 16-byte buffer. This allows up to 16 sequential bytes to be loaded into the internal buffer and written to memory in a single I²C transaction, significantly improving write efficiency compared to individual byte writes. Page boundaries align to 16-byte intervals (00h–0Fh, 10h–1Fh, etc.), and crossing boundaries causes wraparound within the same page.