Microchip Technology 24LCS52/SN

Overview

24LCS52/SN from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with hardware and software write protection, organized as 256 × 8-bit memory, operating from 2.2V to 5.5V, supporting up to 400 kHz clock frequency (at V_CC ≥ 2.2V), and rated for industrial temperature range (–40°C to +85°C). It is used in embedded systems for nonvolatile storage of calibration data, configuration registers, and device identifiers.

For engineers reviewing the 24LCS52/SN datasheet, 24LCS52/SN pinout, 24LCS52/SN application, or 24LCS52/SN equivalent, key selection criteria include its dual write-protection scheme (WP pin + software fuse), 16-byte page write buffer, Schmitt-trigger I²C inputs for noise immunity, and compatibility with standard 2-wire bus timing across voltage and temperature ranges.

Technical Context

The 24LCS52/SN implements a true 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 a 16-byte page write buffer, address pointer auto-increment, and dedicated write-protect register accessible via control code '0110'.

Write protection operates at two levels: hardware-level full-array lock via WP pin tied to V_CC, and software-level permanent lock of lower 128 bytes (00h–7Fh) via irreversible fuse programming. The device incorporates V_CC threshold detection (<1.5V disable), Schmitt-trigger inputs, and output slope control to suppress ground bounce and ensure robust operation on noisy PCBs.

Key Specifications

Pinout & Package

24LCS52/SN is available in Pb-free 8-lead SOIC (SN) package per Microchip's marking convention: "S52" top mark, "I" for Industrial grade, "510" week/year code. Package dimensions conform to JEDEC MS-012 (SOIC narrow, 150 mil).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA52-I/P and AT24C02C-SSHM-T, the 24LCS52/SN uniquely combines guaranteed 400 kHz operation above 2.2V, irreversible software write-protect for safety-critical data, and industrial-grade reliability-making it optimal for applications demanding both speed and assured data integrity.

Availability

24LCS52/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, automotive body control modules, and smart energy metering requiring stable component supply across extended product lifecycles.

Supply support for 24LCS52/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 manufacturing and support infrastructure.

The 24LCS52 belongs to Microchip's 24XXX serial EEPROM product line, designed specifically for reliable, low-power nonvolatile storage in space-constrained industrial, medical, and automotive applications where data integrity and long-term retention are critical.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LCS52/SN?

The 24LCS52/SN requires a minimum V_CC of 2.2V for guaranteed operation, including full 400 kHz I²C communication and valid write cycles. Operation below 2.2V is not supported - unlike the 24AA52, which functions down to 1.8V. Internal V_CC detection disables writes below ~1.5V to prevent data corruption during brown-out events, ensuring robustness in unstable power environments.

How does the software write-protect feature work in the 24LCS52/SN?

The 24LCS52/SN software write-protect feature permanently locks the lower 128 bytes (addresses 00h–7Fh) by writing to a dedicated fuse register using control code '0110'. Once set, this protection cannot be reversed. The 24LCS52/SN will no longer acknowledge subsequent '0110' commands, and writes to that region are blocked even if the WP pin is low. This provides immutable storage for calibration constants or security keys.

Can the 24LCS52/SN be used interchangeably with the 24AA52 in existing designs?

The 24LCS52/SN shares identical pinout, memory organization, and I²C protocol with the 24AA52, but differs in V_CC range (2.2–5.5V vs. 1.8–5.5V) and default clock capability (400 kHz guaranteed ≥2.2V vs. 100 kHz <2.2V). If the host system operates ≥2.2V and uses ≤400 kHz, the 24LCS52/SN is functionally compatible; however, designs relying on sub-2.2V operation must retain the 24AA52.

What package type does the '/SN' suffix indicate for the 24LCS52/SN?

Per Microchip's part numbering convention, the '/SN' suffix denotes the 8-lead SOIC (Small Outline Integrated Circuit) package with 150-mil body width and Pb-free matte tin finish. This surface-mount package is RoHS-compliant, reflow-solderable, and widely supported in automated assembly lines. Marking on the 24LCS52/SN device reads 'S52', 'I', and date code (e.g., '510' for 2015, week 10).

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

Yes, the 24LCS52/SN supports page write operations with a 16-byte page buffer. Writes must remain within a single physical page boundary (i.e., addresses aligned to 00h–0Fh, 10h–1Fh, etc.). Attempting to cross a page boundary causes wraparound within the current page. Each page write completes in ≤5 ms, and the device supports ACK polling to determine write completion without fixed delays.