Microchip Technology 24LCS52-I/SN

Overview

24LCS52-I/SN from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8 bits, operating from 2.2V to 5.5V with 400 kHz max clock frequency (down to 100 kHz below 2.2V), 1 µA standby current, and hardware/software write protection-used for nonvolatile parameter storage in industrial sensor nodes and embedded control modules.

For engineers reviewing the 24LCS52-I/SN datasheet, 24LCS52-I/SN pinout, 24LCS52-I/SN application, or 24LCS52-I/SN equivalent, key selection criteria include its 2.2–5.5 V supply range, I²C bus compatibility with Schmitt-trigger inputs, page-write buffer (up to 16 bytes), 1,000,000 erase/write cycles, and industrial temperature rating (−40°C to +85°C).

Technical Context

The 24LCS52-I/SN 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 one bus. It uses internal address pointer logic for sequential reads and supports current-address, random, and sequential read modes.

Write operations include byte-write and page-write (max 16 bytes per page), with self-timed internal write cycle (5 ms typical). Write protection is enforced via dedicated WP pin (hardware-level full-array lock) and software-configurable lower-half array lock (addresses 00h–7Fh), both active during power-up and independent of VCC level.

Key Specifications

Pinout & Package

24LCS52-I/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 150-mil body width, surface-mount footprint, and Pb-free matte tin finish. Pin 1 is A0 (chip address input), pin 4 is VSS (ground), pin 5 is SDA (bidirectional open-drain I²C data), pin 6 is SCL (I²C clock input), pin 7 is WP (hardware write-protect input), and pin 8 is VCC (power supply).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LCS52-I/SN, 24AA52-I/SN offers broader voltage flexibility at the cost of slightly relaxed timing margins below 2.2V, while AT24C02C-SSHM-T trades software write-protect capability for higher clock speed and extended low-voltage operation - making each alternative optimal for distinct system-level trade-offs.

Availability

24LCS52-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, automotive body control modules, and smart energy metering requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 24LCS52-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 24LCS52 belongs to Microchip's legacy 24XXX serial EEPROM product line, designed specifically for reliable, low-power, I²C-based nonvolatile storage in industrial, automotive, and consumer applications demanding high endurance and robust noise immunity.

FAQ

What is the minimum operating voltage for the 24LCS52-I/SN?

The 24LCS52-I/SN has a specified minimum operating voltage of 2.2 V. Below this threshold, the device is not guaranteed to function correctly, and I²C clock frequency is limited to 100 kHz. This differs from the 24AA52 variant, which supports operation down to 1.8 V. The 24LCS52-I/SN's 2.2 V lower limit ensures stable internal voltage regulation and write-cycle timing integrity across its industrial temperature range.

Does the 24LCS52-I/SN support page write operations, and what is the buffer size?

Yes, the 24LCS52-I/SN supports page write operations with a 16-byte internal buffer. This allows up to 16 bytes to be loaded into the buffer and written to contiguous memory locations in a single I²C transaction, reducing bus overhead versus individual byte writes. Page boundaries align to 16-byte intervals (e.g., 00h–0Fh, 10h–1Fh), and crossing a boundary causes wraparound within the same page - a behavior that firmware must manage explicitly.

How does hardware write protection work on the 24LCS52-I/SN?

Hardware write protection on the 24LCS52-I/SN is controlled by the WP pin: when tied to VCC, it permanently disables all write operations to the entire 256-byte memory array, regardless of software write-protect status. When tied to VSS, hardware protection is disabled, and write access depends solely on the software write-protect register state. This dual-layer scheme provides fail-safe protection against unintended writes during power-up or firmware faults.

Can the 24LCS52-I/SN be used in a 1.8V system?

No, the 24LCS52-I/SN is not rated for 1.8 V operation. Its absolute minimum supply voltage is 2.2 V, as confirmed in the Device Selection Table and Electrical Characteristics section of DS21166K. Attempting to operate the 24LCS52-I/SN below 2.2 V may result in unreliable communication, failed writes, or undefined behavior. For 1.8 V systems, the pin-compatible 24AA52-I/SN is the appropriate Microchip alternative.

What package type does the 24LCS52-I/SN use, and is it RoHS-compliant?

The 24LCS52-I/SN uses an 8-lead SOIC package with 150-mil body width (standard JEDEC MS-012), marked "24LCS52I SN" per packaging documentation. It features Pb-free matte tin (Sn) finish and complies with RoHS Directive 2011/65/EU. The "SN" suffix explicitly denotes the SOIC package variant, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life at ≤30°C/85% RH.