STMicroelectronics M24C64-DFCT6TP/K

Overview

M24C64-DFCT6TP/K from STMicroelectronics is a 64-Kbit (8 Kbyte) I²C-compatible EEPROM organized as 8K × 8 bits, supporting 1 MHz, 400 kHz, and 100 kHz bus modes. It operates from 1.7 V to 5.5 V over –40 °C to +85 °C, features 32-byte page write with ≤5 ms latency, and includes an additional lockable 32-byte identification page for secure parameter storage - used in industrial sensor calibration and embedded firmware configuration.

For engineers reviewing the M24C64-DFCT6TP/K datasheet, M24C64-DFCT6TP/K pinout, M24C64-DFCT6TP/K application, or M24C64-DFCT6TP/K equivalent, key selection criteria include I²C speed compatibility, low-voltage operation down to 1.7 V, write-protection via WC pin, identification page locking capability, and ECOPACK2-compliant WLCSP-5 packaging for space-constrained PCBs.

Technical Context

The device implements a standard I²C slave protocol with 7-bit device addressing (1010xxxR/W for memory array; 1011xxxR/W for identification page), where E2–E0 pins configure the three LSBs of the address. It uses internal high-voltage generation and sequencer logic for EEPROM cell programming, with ECC logic (on process-K variants) correcting single-bit errors per 4-byte group.

Write control (WC) enables hardware-level memory protection: when driven high, all write operations (byte, page, ID page) are inhibited and return NoAck; when low or floating, writes proceed. The identification page supports two dedicated instructions - write ID page and lock ID page - with A10 bit distinguishing between them.

Key Specifications

Pinout & Package

Package: WLCSP-5 (5-bump ultra-thin chip-scale package, ECOPACK2 compliant, 0.4 mm pitch, marking side top view). Pin mapping validated per DS6638 Rev 38 Figure 5 and Table 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C EEPROM applications.

Compared with AT24C64D-SSHM-T and BR24G64FJ-WE2, M24C64-DFCT6TP/K uniquely delivers hardware-enforced write protection via WC pin and a physically separate, permanently lockable identification page - critical for traceability, security, and functional safety certification.

Availability

M24C64-DFCT6TP/K is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, and medical device configuration requiring stable component supply, long-lifecycle assurance, and ECOPACK2-compliant packaging.

Supply support for M24C64-DFCT6TP/K 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, designing and manufacturing microcontrollers, power ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

The M24Cxx series targets high-reliability embedded systems needing robust, low-voltage I²C EEPROM with enhanced security features - specifically engineered for calibration, configuration, and secure parameter storage in constrained environments.

FAQ

What is the function of the WC pin on M24C64-DFCT6TP/K?

The WC (Write Control) pin is an active-high hardware write protect input. When driven high, it disables all write operations - including byte write, page write, and identification page write - and causes the device to return NoAck for data bytes. This provides deterministic, glitch-immune protection independent of firmware state or I²C bus activity.

Does M24C64-DFCT6TP/K support 1 MHz I²C operation across its full temperature and voltage range?

Yes. M24C64-DFCT6TP/K supports 1 MHz I²C operation over its full specified ambient temperature range (–40 °C to +85 °C) and supply voltage range (1.7 V to 5.5 V), as confirmed in DS6638 Rev 38 AC characteristics (Table 12, fSCL max = 1 MHz at VCC ≥ 2.5 V; derated to 400 kHz below 2.5 V).

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

The identification page is locked via the "Lock ID" instruction: device select code 1011xxx0, A10 = 1, and data byte = xxxx xx1x. Once executed, the lock is permanent and irreversible - the page becomes read-only for life. No command or voltage sequence can unlock it, ensuring tamper-proof storage of calibration or security data.

Which package variant does M24C64-DFCT6TP/K correspond to, and what are its mechanical dimensions?

M24C64-DFCT6TP/K is the WLCSP-5 (5-bump wafer-level chip-scale package) variant with ECOPACK2 compliance. Its dimensions are 1.05 mm × 1.05 mm × 0.39 mm (L × W × H), 0.4 mm bump pitch, and bottom-side solder bumps arranged per Figure 5 and Table 3 of DS6638 Rev 38.