STMicroelectronics M24C32-DFDW6TP

Overview

M24C32-DFDW6TP from STMicroelectronics is a 32-Kbit I²C-compatible EEPROM organized as 4 K × 8 bits, featuring an additional 32-byte identification page, hardware write protection via WC pin, and operation from 1.7 V to 5.5 V across –40 °C to +85 °C. It supports fast-mode-plus (1 MHz), fast-mode (400 kHz), and standard-mode (100 kHz) I²C bus timing and is used in industrial sensor calibration storage and embedded system configuration retention.

For engineers reviewing the M24C32-DFDW6TP datasheet, M24C32-DFDW6TP pinout, M24C32-DFDW6TP application, or M24C32-DFDW6TP equivalent, key selection criteria include I²C voltage compatibility (1.7–5.5 V), identification page lock capability, page write size (32 bytes), and WC-controlled full-array write protection - all critical for secure firmware parameter storage in automotive ECUs and IoT edge nodes.

Technical Context

The device implements a standard I²C target protocol with 7-bit device addressing, where E2/E1/E0 pins configure the three LSBs of the slave address (000 by default in UFDFPN5 package). It uses open-drain SDA with external pull-up and supports random/sequential read, byte/page write, and dedicated identification page access using distinct device type identifiers (1010b for memory, 1011b for ID page).

Internal architecture includes a 4-Kbyte main array plus a separate 32-byte identification page that can be permanently locked in read-only mode via a dedicated lock instruction. Write control (WC) disables all write operations when high, and the device incorporates built-in power-on reset (POR) and enhanced ESD/latch-up protection per JEDEC standards.

Key Specifications

Pinout & Package

Package: UFDFPN5 (DFN5, 1.7 mm × 1.4 mm, 0.4 mm pitch, ECOPACK2-compliant). This ultra-compact 5-pin package omits E2/E1/E0 pins - they are internally tied low (000), fixing the device address to 1010000b (0x50) for memory access and 1011000b (0x58) for identification page access.

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-3GE2, the M24C32-DFDW6TP uniquely combines hardware-enforced full-array write disable (WC), a permanently lockable 32-byte ID page, and guaranteed 1 MHz operation down to 1.7 V - making it the only option among the three qualified for secure boot credential storage in battery-operated medical and automotive systems.

Availability

M24C32-DFDW6TP is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU configuration, and IoT edge node identity management requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for M24C32-DFDW6TP 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 analog, MCU, power, and memory products for industrial, automotive, and consumer markets.

The M24C32 series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-voltage, secure nonvolatile storage in space-constrained embedded systems requiring guaranteed data integrity and long-term reliability.

FAQ

What is the function of the WC pin on M24C32-DFDW6TP?

The WC (Write Control) pin is an active-high hardware enable that globally disables all write operations to both the main 4-Kbyte memory array and the 32-byte identification page. When driven high, the device acknowledges device select and address bytes but returns NoAck for data bytes, preventing any memory modification - critical for protecting calibration data during brown-out conditions.

How does the identification page differ from the main memory array?

The identification page is a physically separate 32-byte memory segment accessible only via I²C device type identifier 1011b (0xBx address). It supports dedicated write and lock instructions; once locked, its contents become permanently read-only and cannot be altered even if WC is low - enabling secure storage of immutable device identity such as MAC addresses or cryptographic seeds.

Which I²C address does M24C32-DFDW6TP use in UFDFPN5 package?

In the UFDFPN5 (MH) package, E2/E1/E0 pins are omitted and internally tied low (000), fixing the 7-bit device address to 1010000b (0x50) for main memory access and 1011000b (0x58) for identification page access. The R/W bit determines direction, resulting in write addresses 0xA0/0xB0 and read addresses 0xA1/0xB1 respectively.

Can M24C32-DFDW6TP operate reliably at 1.7 V across its full temperature range?

Yes - the M24C32-DF variant (including DFDW6TP) is fully specified for 1.7 V to 5.5 V operation across –40 °C to +85 °C. All AC and DC parameters, including 1 MHz I²C timing, 5 ms write cycle, and 4 million endurance cycles, are guaranteed at 1.7 V within this temperature range, as confirmed in STMicroelectronics datasheet DS0952 Rev 33.