Microchip Technology 24LCS52-I/ST

Overview

24LCS52-I/ST from Microchip Technology 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/ST datasheet, 24LCS52-I/ST pinout, 24LCS52-I/ST application, or 24LCS52-I/ST equivalent, key selection criteria include its 2.2–5.5 V supply range, 400 kHz I²C interface timing, WP pin-based full-array hardware lock, software-protected lower 128 bytes, and 8-lead SOIC package compatibility with legacy board layouts.

Technical Context

The 24LCS52-I/ST implements a standard two-wire I²C slave interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and ground bounce. It supports byte and page writes (up to 16 bytes per page) with self-timed internal erase/write cycles requiring no external timing control.

Its dual write-protection architecture includes a dedicated WP pin for full-array hardware lock and a one-time-programmable software register protecting addresses 00h–7Fh. The device uses an internal address pointer for sequential reads and supports up to eight devices on one bus via A0–A2 address pins.

Key Specifications

Pinout & Package

24LCS52-I/ST is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and Pb-free, with industry-standard pinout compatible across PDIP, TSSOP, MSOP, DFN, and TDFN variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA52-I/ST and AT24C02C-SSHM-T, the 24LCS52-I/ST provides stricter voltage-defined timing behavior above 2.2 V and unique one-time software write-lock capability-making it optimal for industrial systems where both voltage margin and layered memory protection are design requirements.

Availability

24LCS52-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded configuration storage, and firmware metadata retention requiring stable component supply across extended temperature and long product lifecycles.

Supply support for 24LCS52-I/ST 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 family, designed specifically for reliable, low-power, I²C-based nonvolatile storage in industrial, automotive, and consumer applications demanding extended temperature operation and robust write protection.

FAQ

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

The 24LCS52-I/ST operates from 2.2 V to 5.5 V. Unlike the 24AA52 variant, it is not rated for 1.8 V operation. Below 2.2 V, the maximum I²C clock frequency drops to 100 kHz, and functionality is not guaranteed per datasheet specifications. This voltage floor ensures stable internal charge pump operation for write cycles.

Does 24LCS52-I/ST support page write operations?

Yes, the 24LCS52-I/ST supports page write operations with a 16-byte buffer. Up to 16 bytes can be written in a single transaction, provided they reside within the same 16-byte physical page boundary (addresses 00h–0Fh, 10h–1Fh, etc.). Crossing a page boundary causes wraparound, overwriting earlier data in that page-application firmware must enforce alignment.

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

Hardware write protection on the 24LCS52-I/ST is controlled by the WP pin: when tied to VCC, the entire 256-byte memory array is locked against all write commands-including byte, page, and software write-protect register writes. When WP = VSS, protection depends solely on the software write-protect register state for addresses 00h–7Fh.

Can the software write-protect feature of 24LCS52-I/ST be reset?

Yes, the software write-protect fuse on the 24LCS52-I/ST can be reset using a special RWPF command (control byte 1001 followed by 00001000). This requires applying VCC + 5.5 V to the WP pin for ≥1 µs before issuing the command, and observing a 5 ms delay after the Stop condition. Standard 24LCS52-I/ST operation does not require this voltage boost.

What package type is used for 24LCS52-I/ST?

The 24LCS52-I/ST is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 3.9 mm × 4.9 mm body dimensions and 1.27 mm lead pitch. The '/ST' suffix explicitly denotes this SOIC package, which is pin-compatible with other 8-lead variants like PDIP, TSSOP, and MSOP-but requires layout verification for thermal and mechanical fit.