Microchip Technology 24LCS52T-I/MS

Overview

24LCS52T-I/MS from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with hardware/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 settings, and device identifiers.

For engineers reviewing the 24LCS52T-I/MS datasheet, 24LCS52T-I/MS pinout, 24LCS52T-I/MS application, or 24LCS52T-I/MS 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 MSOP-8 packaging suitable for space-constrained industrial control modules.

Technical Context

The 24LCS52T-I/MS 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. 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 = V_CC, regardless of software fuse state.

It features built-in V_CC threshold detection disabling write operations below 1.5V, Schmitt-trigger inputs with 0.05×V_CC hysteresis, and output slope control to suppress ground bounce. Write cycles are self-timed (max 5 ms), and acknowledge polling is supported to determine completion without fixed delays.

Key Specifications

Pinout & Package

24LCS52T-I/MS is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm × 1.0 mm body, 0.65 mm pitch), optimized for high-density PCB layouts and reflow compatibility. The exposed pad (pin 8) may be connected to V_SS or left floating per design requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA52-I/MS and AT24C02C-SSHM-T, the 24LCS52T-I/MS uniquely combines guaranteed 400 kHz performance above 2.2V, hardware-enforced write protection independent of software state, and a one-time programmable lower-array lock-making it optimal for industrial systems requiring deterministic security and timing behavior.

Availability

24LCS52T-I/MS is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, smart energy meters, and automated test equipment requiring stable component supply across multi-year production cycles.

Supply support for 24LCS52T-I/MS 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 serial EEPROM product line, designed specifically for robust, low-power nonvolatile data storage in industrial, medical, and communications equipment where reliability, security, and long-term data integrity are critical.

FAQ

What is the minimum supply voltage required for reliable operation of the 24LCS52T-I/MS?

The 24LCS52T-I/MS requires a minimum supply voltage of 2.2V for full specification compliance, including 400 kHz I²C operation and guaranteed write functionality. Operation below 2.2V is not supported-unlike the 24AA52, which supports down to 1.8V. The internal V_CC detector disables write logic below ~1.5V to prevent data corruption, but read access may become unreliable below the 2.2V rating. Always maintain V_CC ≥ 2.2V for 24LCS52T-I/MS.

How does the software write-protect feature work in the 24LCS52T-I/MS?

The software write-protect feature in the 24LCS52T-I/MS permanently locks the lower 128 bytes (addresses 00h–7Fh) against writes by programming a one-time fuse using a special '0110' control byte sequence. Once set, this protection cannot be reversed through normal means. The 24LCS52T-I/MS will still acknowledge write attempts to this region but will not store data. This feature is independent of the WP pin state and provides immutable storage for factory calibration data.

Can the 24LCS52T-I/MS be used interchangeably with the 24AA52-I/MS on the same PCB?

No-the 24LCS52T-I/MS and 24AA52-I/MS are not drop-in replacements due to differing V_CC minima and I²C timing behavior. While both share identical pinout and MSOP-8 packaging, the 24LCS52T-I/MS guarantees 400 kHz operation only at V_CC ≥ 2.2V, whereas the 24AA52-I/MS supports 100 kHz down to 1.8V. Substituting without verifying voltage margins and clock timing may cause communication failures or incomplete writes in low-V_CC conditions.

What is the purpose of the exposed pad on the 24LCS52T-I/MS MSOP package?

The exposed pad on the 24LCS52T-I/MS MSOP package (designated as pin 8 in package drawings) serves as a thermal and electrical connection point. It may be connected to V_SS to improve heat dissipation and reduce ground impedance, or left floating if thermal constraints are minimal. Microchip specifies no mandatory connection, and PCB layout should follow JEDEC MO-203 standards for thermal relief and solder paste stencil design to ensure reliable reflow attachment.

Does the 24LCS52T-I/MS support sequential reads across multiple devices on the same I²C bus?

No-the 24LCS52T-I/MS does not support contiguous sequential reads across device boundaries. While up to eight 24LCS52T-I/MS units can share one I²C bus using A2/A1/A0 addressing, the internal address pointer resets after each Stop condition and does not auto-increment across devices. Sequential reads are confined to the 256-byte address space of a single device. To read from multiple units, the master must issue separate Start/Address/Read sequences for each device.