STMicroelectronics M24C64-DFMN6TP

Overview

M24C64-DFMN6TP from STMicroelectronics is a 64-Kbit I²C-compatible EEPROM organized as 8 K × 8 bits, operating from 1.7 V to 5.5 V over –40 °C to +85 °C, supporting 1 MHz/400 kHz/100 kHz I²C bus modes, with 32-byte page write capability and an additional lockable 32-byte identification page for secure parameter storage in industrial control and embedded systems.

For engineers reviewing the M24C64-DFMN6TP datasheet, M24C64-DFMN6TP pinout, M24C64-DFMN6TP application, or M24C64-DFMN6TP equivalent, this device is selected for low-voltage, high-reliability serial memory tasks requiring >4 million write cycles, 200-year data retention, and hardware-level write protection via WC pin and E0–E2 address configuration.

Technical Context

The M24C64-DFMN6TP implements a standard I²C slave interface with start/stop detection, ACK/NACK handshaking, and internal address auto-increment during sequential reads. Its block diagram includes dedicated ECC logic (for process-letter-K variants), a page latch architecture enabling 32-byte burst writes within ≤5 ms, and a POR circuit preventing spurious writes during power-up.

Chip enable (E2/E1/E0) pins define the 3 LSBs of the 7-bit device address (1010xxx for memory array, 1011xxx for ID page), while the WC pin provides hardware-level global write inhibit-asserting WC high disables all write operations including byte/page/ID-page writes, but still allows address acknowledgment.

Key Specifications

Pinout & Package

Package: SO8N (ECOPACK2), 150 mil width, RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C64D-SSHM-T and BR24G64FJ-WE2, the M24C64-DFMN6TP uniquely combines 1 MHz I²C, hardware WC-based global write disable, and a permanently lockable 32-byte ID page - making it the only option among the three qualified for secure, high-speed, low-voltage industrial configuration storage.

Availability

M24C64-DFMN6TP is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, medical device settings backup, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for M24C64-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, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

The M24C64 series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, I²C-based nonvolatile storage in space-constrained and thermally demanding embedded systems.

FAQ

What is the function of the WC pin on the M24C64-DFMN6TP?

The WC (Write Control) pin is an active-high hardware write protect input. When driven high, it disables all write operations-including byte, page, and identification page writes-while still allowing read access and device address acknowledgment. This prevents accidental overwrites during system initialization or firmware updates, and is especially valuable in safety-critical or tamper-resistant applications like smart meters and medical devices.

Does the M24C64-DFMN6TP include error correction code (ECC)?

ECC is implemented only in M24C64-DFMN6TP units fabricated with ST's "K" process letter, as indicated in the top-marking. The ECC logic operates transparently on groups of four consecutive bytes, detecting and correcting single-bit errors during read operations. Devices with other process letters lack ECC. Users must verify the marking (e.g., "K" suffix) on the physical part or order code to confirm ECC presence.

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

The identification page is a dedicated 32-byte memory region accessible only via special I²C commands (device type identifier 1011b). It supports write and permanent lock operations-once locked, its contents become read-only for the life of the device. Unlike the main array, it is intended for storing immutable, security-sensitive data such as calibration certificates or cryptographic keys, and is physically isolated from routine configuration updates.

Can the M24C64-DFMN6TP operate reliably at 1.7 V across its full temperature range?

Yes. The M24C64-DFMN6TP is fully specified for 1.7 V to 5.5 V operation over the industrial temperature range of –40 °C to +85 °C. At 1.7 V, all AC and DC parameters-including 1 MHz I²C timing, 5 ms write time, and read/write endurance-are guaranteed per DS6638 Rev 38. This enables direct integration with ultra-low-power microcontrollers without voltage translation.