STMicroelectronics M24C64-DFDW6TP

Overview

M24C64-DFDW6TP from STMicroelectronics is a 64-Kbit (8 Kbyte) I²C-compatible serial EEPROM organized as 8K × 8 bits, featuring a 32-byte page size and an additional write-lockable identification page. It operates from 1.7 V to 5.5 V across –40 °C to +85 °C, supports I²C bus speeds up to 1 MHz, and delivers >4 million write cycles with >200-year data retention. It is used in industrial sensor calibration storage, embedded system configuration backup, and firmware parameter retention.

For engineers reviewing the M24C64-DFDW6TP datasheet, M24C64-DFDW6TP pinout, M24C64-DFDW6TP application, or M24C64-DFDW6TP equivalent, key selection criteria include supply voltage range (1.7–5.5 V), I²C speed compatibility (100/400 kHz/1 MHz), page write timing (≤5 ms), write protection via WC pin, and identification page lockability for secure parameter storage.

Technical Context

The device implements a standard I²C slave protocol with 7-bit addressing plus R/W bit, supporting random, sequential, and current-address read modes. Its internal architecture includes an ECC logic block (on process-K variants) that corrects single-bit errors per 4-byte group, enhancing long-term reliability without protocol overhead.

Chip enable (E2/E1/E0) pins configure the device address (b3–b1 of 7-bit select code); for the DFDW6TP variant (TSSOP8 package), these pins are externally accessible and must be tied to VCC/VSS to set the device address. Write control (WC) provides hardware-level memory array protection: high = full-array write inhibit, low or floating = write enabled.

Key Specifications

Pinout & Package

Package: TSSOP8 (DW), 169 mil width, RoHS-compliant and halogen-free (ECOPACK2).

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-DFDW6TP uniquely combines hardware write control (WC), a lockable identification page, and full 1.7–5.5 V operation-making it the only option among the three qualified for secure, wide-voltage, tamper-resistant parameter storage in industrial and medical systems.

Availability

M24C64-DFDW6TP is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and firmware parameter backup requiring stable component supply and long-term lifecycle support.

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

The M24Cxx series targets robust, low-power serial EEPROM applications demanding extended data retention, high endurance, and hardware-level security features-especially in mission-critical industrial and medical electronics.

FAQ

What is the function of the WC pin on M24C64-DFDW6TP?

The WC (Write Control) pin is a hardware-level write protect input. When driven high, it disables all write operations-including byte, page, and identification page writes-to the entire memory array. When low or left floating, writes are enabled. This provides deterministic, glitch-immune protection independent of firmware state or I²C bus activity.

Does M24C64-DFDW6TP support 1 MHz I²C operation across its full voltage range?

Yes. The M24C64-DFDW6TP supports 1 MHz I²C operation from 1.7 V to 5.5 V over the full industrial temperature range (–40 °C to +85 °C), as confirmed in DS6638 Rev 38 Section 1 and AC characteristics tables. No voltage derating is required for high-speed mode.

How is the identification page locked, and is the lock reversible?

The identification page is locked via a dedicated "Lock ID" instruction using device select code 1011b and address bit A10 = 1. Once executed, the lock is permanent and irreversible-no command or voltage sequence can unlock it. This ensures cryptographic keys or calibration data stored in the page remain tamper-proof for the device's lifetime.

What package type does M24C64-DFDW6TP use, and what are its key mechanical features?

M24C64-DFDW6TP uses the TSSOP8 (DW) package: 8-pin, 169 mil body width, 0.65 mm lead pitch, ECOPACK2-compliant (RoHS and halogen-free). Its gull-wing leads enable reliable automated optical inspection (AOI) and provide superior thermal dissipation versus SO8N in compact PCB layouts.