Microchip Technology 24AA52T-I/SN

Overview

24AA52T-I/SN from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 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 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 in embedded microcontroller systems requiring nonvolatile parameter storage.

For engineers reviewing the 24AA52T-I/SN datasheet, 24AA52T-I/SN pinout, 24AA52T-I/SN application, or 24AA52T-I/SN equivalent, key selection criteria include its industrial-grade temperature range (−40°C to +85°C), Schmitt-trigger noise immunity on SDA/SCL, slope-controlled outputs to suppress ground bounce, and compatibility with standard I²C bus timing across voltage variants.

Technical Context

The 24AA52T-I/SN implements a true 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 one bus. Its internal architecture includes an address pointer, page write buffer, HV generator for EEPROM programming, and independent software/hardware write-protect logic that enforces access control at both register and physical array levels.

It features self-timed write cycles (5 ms max), acknowledge polling for bus efficiency, and robust noise suppression via Schmitt-trigger inputs and input filter spike suppression (50 ns). The device incorporates VCC threshold detection (<1.5V disable) and ESD protection >4 kV, ensuring reliable operation in electrically noisy industrial environments.

Key Specifications

Pinout & Package

24AA52T-I/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 150-mil body width, RoHS-compliant matte tin (Sn) finish, and industrial temperature rating. The package is surface-mount compatible and pin-compatible with other 24XXX52 family variants in SOIC, TSSOP, MSOP, DFN, and TDFN footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA52T-I/SN, 24LC52-I/SN sacrifices 1.8V compatibility for marginally lower cost, while AT24C02C-SSHM-T offers faster clocking but reduced multi-device addressing flexibility - making 24AA52T-I/SN optimal for mixed-voltage, high-density I²C systems requiring industrial reliability.

Availability

24AA52T-I/SN is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, automotive body control modules, and smart home gateways requiring stable component supply across extended lifecycle programs.

Supply support for 24AA52T-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 24AA52T-I/SN belongs to Microchip's 24XXX52 family of I²C serial EEPROMs, designed specifically for robust, low-power nonvolatile storage in industrial, automotive, and medical applications where voltage flexibility and dual write protection are critical.

FAQ

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

The 24AA52T-I/SN operates down to 1.8V, supporting direct connection to 1.8V logic families and ultra-low-power microcontrollers. Below 2.2V, its maximum I²C clock frequency reduces to 100 kHz to maintain timing margins and noise immunity - a verified specification confirmed in DS21166K, Table 1-2.

How does hardware write-protection work on the 24AA52T-I/SN?

Hardware write-protection on the 24AA52T-I/SN is controlled by the WP pin: when tied to VCC, it disables writes to the entire memory array regardless of software write-protect status. This feature is documented in Section 2.4 and Figure 7-1 of DS21166K and provides system-level security during firmware updates or field service.

Can the 24AA52T-I/SN be used in multi-device I²C configurations?

Yes - the 24AA52T-I/SN supports up to eight devices on a single I²C bus using its A0, A1, and A2 address pins. Each device responds only when its unique 3-bit address matches the transmitted slave address, as defined in Section 4.6 and Figure 4-2 of DS21166K.

What is the page write capability of the 24AA52T-I/SN?

The 24AA52T-I/SN supports page writes of up to 16 bytes within a single 16-byte physical page boundary. Attempting to cross page boundaries causes wraparound instead of sequential addressing - a behavior explicitly described in Section 5.2 and Note under Figure 5-2 of DS21166K.

Does the 24AA52T-I/SN include noise suppression features?

Yes - the 24AA52T-I/SN integrates Schmitt-trigger inputs on SDA and SCL pins plus 50 ns input filter spike suppression (Table 1-2, Parameter TSP), eliminating false Start/Stop detection in electrically noisy environments such as motor drives or industrial PLC backplanes.