STMicroelectronics M24C32-XMC5TG

Overview

M24C32-XMC5TG from STMicroelectronics is a 32-Kbit I²C-compatible EEPROM organized as 4 K × 8 bits, featuring hardware write protection (WC pin), 32-byte page write capability, and operation from 1.6 V to 5.5 V over -20 °C to +85 °C. It supports I²C fast mode plus (1 MHz), includes an open-drain SDA interface with external pull-up requirement, and is used for parameter storage in industrial sensor nodes and embedded control modules.

For engineers reviewing the M24C32-XMC5TG datasheet, M24C32-XMC5TG pinout, M24C32-XMC5TG application, or M24C32-XMC5TG equivalent, key selection criteria include supply voltage headroom down to 1.6 V, WC-controlled full-array write lock, 5 ms max byte/page write time, and compatibility with standard/fast/fast-mode-plus I²C timing budgets in space-constrained designs.

Technical Context

The device implements a target-only I²C slave architecture with fixed 7-bit device address (1010xxxR/W) where E2–E0 pins define the three LSBs; for the UFDFPN5 package (MC5 suffix), E2–E0 are unconnected and internally read as 000. It uses internal power-on reset (POR) to suppress spurious writes during power ramp, and features automatic address counter increment on read/write completion.

Write control (WC) is a dedicated active-high input that disables all data byte acknowledgments when asserted - device select and address bytes remain acknowledged, enabling protocol-compliant detection of write-protection status. The memory array supports both random and sequential read modes, with rollover addressing at page boundaries during sequential operations.

Key Specifications

Pinout & Package

Package: UFDFPN5 (MC5), DFN5 1.7 × 1.4 mm, ECOPACK2-compliant, unsawn wafer-tested die. Pin 1 = SDA, Pin 2 = SCL, Pin 3 = WC, Pin 4 = VCC, Pin 5 = VSS. E2–E0 inputs are not bonded and internally tied low (000).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C EEPROM applications.

Compared with AT24C32D and BR24G32FJ, the M24C32-XMC5TG uniquely delivers guaranteed 1.6 V write functionality and dedicated WC pin for zero-software, hardware-enforced memory lockdown - critical for safety-critical and ultra-low-power deployments.

Availability

M24C32-XMC5TG is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter parameter storage, and automotive body control modules requiring stable component supply across extended temperature and voltage ranges.

Supply support for M24C32-XMC5TG 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

The M24C32 series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-voltage I²C data storage in space-constrained and mission-critical embedded systems.

FAQ

What is the function of the WC pin on M24C32-XMC5TG?

The WC (Write Control) pin is an active-high input that globally disables all memory write operations. When driven high, the device acknowledges device select and address bytes but returns NoAck for data bytes - preventing unintended modifications while maintaining I²C bus visibility. This hardware lock operates independently of software state and remains effective across power cycles.

Does M24C32-XMC5TG support 1 MHz I²C communication?

Yes, M24C32-XMC5TG fully supports I²C fast mode plus at 1 MHz. Its AC timing parameters (tBUF, tHD:STA, tSU:STA, etc.) are specified and tested up to this rate in the DS0952 datasheet Rev 33. System-level compliance requires proper PCB layout, controlled slew rate on SCL/SDA, and appropriate pull-up resistor values calculated per Figure 14 and Figure 15 of the datasheet.

Can the identification page be used on M24C32-XMC5TG?

No. The identification page (32-byte additional page with lock capability) is exclusive to the M24C32-DF variant. The M24C32-XMC5TG is part of the M24C32-X family, which lacks the identification page circuitry - only the main 4 Kbyte array is present and accessible via standard I²C addressing.

What is the significance of the 'MC5' suffix in M24C32-XMC5TG?

The 'MC5' suffix denotes the UFDFPN5 (1.7 × 1.4 mm DFN5) package with ECOPACK2 environmental compliance and unsawn wafer-level testing. It confirms E2–E0 pins are unconnected (internally read as 000), and specifies tape-and-reel packaging (TG) for automated SMT assembly - distinguishing it from SO8N (MN), TSSOP8 (DW), or UFDFPN8 (MC) variants.