STMicroelectronics M24C32-DFMC6TG

Overview

M24C32-DFMC6TG from STMicroelectronics is a 32-Kbit I²C-compatible EEPROM organized as 4 K × 8 bits, featuring an additional 32-byte identification page with permanent read-only lock capability. It operates from 1.7 V to 5.5 V across –40 °C to +85 °C, supports I²C fast mode plus (1 MHz), and delivers byte/page write within 5 ms - deployed in industrial sensor calibration storage and embedded firmware parameter retention.

For engineers reviewing the M24C32-DFMC6TG datasheet, M24C32-DFMC6TG pinout, M24C32-DFMC6TG application, or M24C32-DFMC6TG equivalent, key selection criteria include its hardware write protection (WC pin), identification page programmability, 4 million write cycles, and DFN5 (1.7 × 1.4 mm) ECOPACK2 package for space-constrained PCBs.

Technical Context

This EEPROM implements a standard I²C target protocol with 7-bit device addressing, supporting random/sequential read, byte write, and 32-byte page write operations. Its internal address counter auto-increments on read/write, and roll-over behavior is defined at page boundaries (A16–A5 unchanged).

The device integrates a power-on reset (POR) circuit that prevents spurious writes during power-up, and includes enhanced ESD/latch-up protection. The WC pin enables hardware-level memory array protection, while E0–E2 pins configure chip enable address (000 for UFDFPN5 package), and SDA uses open-drain I/O requiring external pull-up.

Key Specifications

Pinout & Package

UFDFPN5 (MH) package: 5-pin DFN, 1.7 mm × 1.4 mm body, 0.5 mm pitch, exposed thermal pad (not electrically connected). Pin 1 marked by dot; top view shown in datasheet Figure 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D and BR24G32FJ, M24C32-DFMC6TG uniquely combines hardware write protection, identification page, and permanent lock in a 1.7×1.4 mm DFN5 package - enabling single-chip secure parameter + calibration storage where board space and trust assurance are constrained.

Availability

M24C32-DFMC6TG is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded firmware parameter storage, IoT edge device identity, and medical diagnostic equipment boot security requiring stable component supply and long-lifecycle support.

Supply support for M24C32-DFMC6TG 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, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

M24C32 belongs to ST's serial EEPROM product line, engineered for reliable, low-power, and secure non-volatile data storage in resource-constrained embedded systems - emphasizing robustness, small footprint, and hardware-assisted security features.

FAQ

What is the function of the WC pin on M24C32-DFMC6TG?

The WC (Write Control) pin is an active-high hardware protection input. When driven high, it disables all write operations to the entire memory array - including byte, page, and identification page writes - regardless of I²C command. This prevents accidental or malicious overwrites during power transients or firmware faults, and remains effective even if the MCU is compromised.

How does the identification page differ from standard memory in M24C32-DFMC6TG?

The identification page is a dedicated 32-byte memory region accessible only via distinct I²C device select codes (1011b prefix). It supports two unique instructions: "write identification page" and "lock identification page". Once locked, it becomes permanently read-only - no further writes are acknowledged - making it ideal for storing immutable calibration data or cryptographic keys that must survive firmware updates.

Can M24C32-DFMC6TG operate at 1.6 V?

No. M24C32-DFMC6TG is rated for 1.7 V to 5.5 V across –40 °C to +85 °C. While the M24C32-X variant supports 1.6 V minimum, the -DF suffix (as in -DFMC6TG) specifies the 1.7 V minimum version. Operating below 1.7 V risks incomplete write cycles, data corruption, or non-compliance with AC timing specifications per DS0952 Rev 33.

Is the UFDFPN5 package pinout compatible with SO8N or TSSOP8 variants of M24C32?

No. UFDFPN5 has 5 pins (SDA, SCL, WC, VCC, VSS) in a 1.7×1.4 mm layout, while SO8N and TSSOP8 use 8-pin configurations with E0–E2 chip-enable inputs and separate ground/power pins. The pin functions and counts differ fundamentally - direct PCB footprint replacement is not possible without redesign. Electrical interface remains I²C-compatible, but mechanical and routing integration requires package-specific layout.