STMicroelectronics M24C32-DFMN6TP

Overview

M24C32-DFMN6TP 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 1 MHz Fast Mode Plus I²C, and delivers ≤5 ms byte/page write time - deployed in industrial sensor calibration storage and embedded system configuration retention.

For engineers reviewing the M24C32-DFMN6TP datasheet, M24C32-DFMN6TP pinout, M24C32-DFMN6TP application, or M24C32-DFMN6TP equivalent, key selection factors include I²C bus speed compatibility (1 MHz/400 kHz/100 kHz), hardware write protection via WC pin, identification page programmability, and ECOPACK2-compliant UFDFPN5 (1.7 × 1.4 mm) packaging for space-constrained PCBs.

Technical Context

The device implements a standard I²C target protocol with 7-bit device addressing, where E0–E2 pins configure the three LSBs of the slave address (000 default in UFDFPN5). It uses open-drain SDA with external pull-up and accepts SCL clock edges up to 1 MHz, with internal power-on reset (POR) ensuring no spurious writes during voltage ramp-up.

Memory access includes random/sequential read, byte/page write, and dedicated identification page operations - the latter enabled by distinct device type identifiers (1011b) and address bit mapping (A10 = 0 for write, A10 = 1 for lock). ECC logic (process-dependent) operates transparently on 4-byte groups to correct single-bit read errors.

Key Specifications

Pinout & Package

Package: UFDFPN5 (1.7 mm × 1.4 mm, 0.5 mm pitch, ECOPACK2-compliant) - ultra-compact, thermally efficient, and reflow-solder compatible for high-density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-SSHM-T and BR24G32FJ-WE2, the M24C32-DFMN6TP uniquely provides a permanently lockable identification page for secure parameter storage - critical for calibration integrity and device identity binding - while maintaining identical I²C performance and package compatibility.

Availability

M24C32-DFMN6TP is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and medical device settings backup requiring stable component supply, long-lifecycle assurance, and ECOPACK2-compliant packaging.

Supply support for M24C32-DFMN6TP 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, specializing in microcontrollers, power management, sensors, and nonvolatile memory solutions for industrial, automotive, and IoT markets.

The M24C32 series belongs to ST's serial EEPROM product line, engineered for robust, low-power, and secure configuration storage in harsh environments - emphasizing write protection, data retention, and I²C interoperability.

FAQ

What is the function of the WC pin on M24C32-DFMN6TP?

The WC (Write Control) pin is an active-high hardware lock that disables all memory write operations when driven high. When left floating or pulled low, writes are enabled. This provides deterministic, glitch-immune protection against accidental overwrites - independent of firmware state or I²C command flow - and is especially valuable during power transitions or debug sessions.

Does M24C32-DFMN6TP support 1 MHz I²C communication?

Yes, M24C32-DFMN6TP fully supports Fast Mode Plus (Fm+) I²C at up to 1 MHz, as confirmed in its official datasheet (DS0952 Rev 33). It maintains timing compliance across its full 1.7–5.5 V supply range and –40 °C to +85 °C operating temperature, enabling high-speed parameter loading in real-time control systems without protocol translation.

How is the identification page different from main memory?

The identification page is a separate 32-byte memory region accessible only via dedicated I²C commands (device type identifier 1011b). Unlike main memory, it can be permanently locked in read-only mode using the lock ID instruction - preventing any future writes even if WC is low - making it ideal for storing immutable calibration signatures or cryptographic keys.

Which package variant does M24C32-DFMN6TP use?

M24C32-DFMN6TP uses the UFDFPN5 package (1.7 mm × 1.4 mm, 0.5 mm pitch), also labeled DFN5. This compact, leadless, surface-mount package features five terminals: SDA, SCL, WC, VCC, and VSS. Chip enable pins E0–E2 are internally tied to ground (000) and not bonded out - simplifying layout and eliminating external address resistors.