Microchip Technology 24LCS52T-I/ST

Overview

24LCS52T-I/ST 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 400 kHz clock frequency (down to 100 kHz below 2.2V), and rated for industrial temperature range (−40°C to +85°C). It enables reliable nonvolatile data storage in space-constrained embedded systems such as smart sensors and power management modules.

For engineers reviewing the 24LCS52T-I/ST datasheet, 24LCS52T-I/ST pinout, 24LCS52T-I/ST application, or 24LCS52T-I/ST 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 requirements across voltage and temperature ranges.

Technical Context

The 24LCS52T-I/ST implements a standard 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 write-protect logic that enforces hardware-level blocking when WP = VCC regardless of software fuse state.

It supports three read modes (current address, random, sequential) and two write modes (byte and page), with self-timed write cycles (max 5 ms), acknowledge polling for bus efficiency, and built-in VCC threshold detection to prevent writes during brown-out conditions below 1.5V. All I/O pins feature Schmitt-trigger inputs and output slope control to suppress ground bounce and EMI.

Key Specifications

Pinout & Package

24LCS52T-I/ST is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, measuring 3.0 mm × 4.4 mm × 1.2 mm, suitable for high-density PCB layouts and automated SMT assembly.

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 24LCS52T-I/ST uniquely combines guaranteed 400 kHz operation above 2.2V with irreversible software write protection - making it optimal for applications where both performance consistency and immutable configuration integrity are mandatory.

Availability

24LCS52T-I/ST is available at Aetrix Electronics and suitable for industrial automation, medical device design, and smart sensor development requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for 24LCS52T-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 24LCS52T-I/ST belongs to Microchip's 24XXX serial EEPROM product line, designed specifically for robust, low-power, I²C-based nonvolatile storage in industrial, automotive, and medical applications demanding high reliability and long-term data integrity.

FAQ

What is the minimum operating voltage for the 24LCS52T-I/ST?

The 24LCS52T-I/ST operates from 2.2V to 5.5V. Unlike the 24AA52 variant, it is not specified for operation below 2.2V - attempting to power it below this threshold may result in undefined behavior or failure to acknowledge I²C commands. This tighter lower limit ensures consistent 400 kHz timing performance across the full industrial temperature range.

Does the 24LCS52T-I/ST support page write operations, and what is the maximum page size?

Yes, the 24LCS52T-I/ST supports page write operations with a maximum buffer size of 16 bytes. Writes crossing physical page boundaries (00h–0Fh, 10h–1Fh, etc.) wrap around within the same page rather than advancing to the next - so application firmware must enforce alignment to avoid unintended overwrites. Each page write still requires only one Stop condition to initiate the internal 5 ms programming cycle.

How does hardware and software write protection interact on the 24LCS52T-I/ST?

When the WP pin is tied to VCC, hardware write protection takes absolute priority: it disables all write operations - including setting or resetting the software write-protect fuse - regardless of the fuse state. Only when WP = VSS does the software fuse become active, permanently locking addresses 00h–7Fh. This layered scheme allows system designers to choose between field-lockdown (WP = VCC) or selective protection (WP = VSS + fuse set).

Can the 24LCS52T-I/ST be used on the same I²C bus as other 24XXX52-family devices?

Yes, the 24LCS52T-I/ST uses the standard 24XXX52 I²C addressing scheme with three hardware-selectable address bits (A2–A0), allowing up to eight devices - including mixed 24AA52 and 24LCS52 variants - on a single bus. All share identical control byte formats and timing, though clock speed must be limited to 100 kHz if any device operates below 2.2V.

What package type is used for the 24LCS52T-I/ST, and are there thermal considerations?

The 24LCS52T-I/ST is supplied in an 8-lead TSSOP package (3.0 × 4.4 × 1.2 mm) with lead-free matte tin finish. Its thermal resistance (θ_JA) is approximately 200°C/W; under typical 1 mA active current and 1 µA standby, self-heating is negligible. However, ensure adequate copper pour and avoid enclosing the device in thermally insulated enclosures when operating continuously at +85°C ambient.