STMicroelectronics M24M01X-FCU6T/VF

Overview

M24M01X-FCU6T/VF from STMicroelectronics is a 1-Mbit (128-Kbyte) I²C-compatible EEPROM with configurable device address register, software write protection register, and 256-byte identification page. It operates across 1.6 V to 5.5 V supply, supports 1 MHz Fast-mode Plus I²C, delivers ≤4 ms page write time, and retains data for >200 years - deployed in industrial sensor calibration storage and embedded firmware parameter retention.

For engineers reviewing the M24M01X-FCU6T/VF datasheet, M24M01X-FCU6T/VF pinout, M24M01X-FCU6T/VF application, or M24M01X-FCU6T/VF equivalent, key selection considerations include its WLCSP-4 package footprint, software-configurable chip enable address (C2/C1), irreversible lock bits (DAL/WPL), 330 nA standby current, and hardware write protection of full memory array.

Technical Context

The M24M01X-FCU6T/VF implements a dedicated I²C target interface with open-drain SDA and input-only SCL, supporting standard (100 kHz), fast (400 kHz), and fast-plus (1 MHz) modes. Its internal architecture includes a high-voltage generator and ECC-enabled sense amplifiers for reliable byte/page writes.

Three non-volatile configuration registers - Device Type Identifier (DTI, read-only), Configurable Device Address (CDA), and Software Write Protection (SWP) - are accessed via dedicated I²C command sequences using distinct MSB address patterns (111/110/101). The 256-byte identification page supports permanent read-only locking after programming.

Key Specifications

Pinout & Package

Package: WLCSP-4 (ECOPACK2, 4-ball, 0.4 mm pitch, 1.17 mm × 1.17 mm footprint). Bottom-side bump layout enables ultra-compact placement on space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24CM01-SSHD-T and BR24M10YFVM-WE2, the M24M01X-FCU6T/VF uniquely integrates configurable addressing, irreversible lock bits, and a dedicated 256-byte ID page - enabling secure, scalable, and space-optimized EEPROM deployment in certified industrial and automotive systems.

Availability

M24M01X-FCU6T/VF is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and IoT edge node identity management requiring stable component supply and long-term lifecycle assurance.

Supply support for M24M01X-FCU6T/VF 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 M24M01X-F series targets space-constrained, high-reliability embedded systems requiring secure, low-power, and configurable non-volatile storage - especially where WLCSP packaging and advanced register-based protection are mandatory.

FAQ

What is the function of the DAL bit in the Configurable Device Address register?

The DAL (Device Address Lock) bit, when set to 1, permanently freezes the CDA register in read-only mode - preventing further changes to C2/C1 address bits. This action is irreversible and ensures stable I²C addressing after initial configuration, eliminating risk of accidental bus conflicts during field operation.

How does the identification page differ from main memory in terms of access and protection?

The 256-byte identification page uses a dedicated I²C command (MSB address = 000) and supports permanent read-only locking via a separate lock command. Unlike main memory, once locked, write attempts return NO ACK - providing hardware-enforced immutability for device-unique data such as serial numbers or cryptographic keys.

Can the M24M01X-FCU6T/VF operate reliably at 1.6 V while sustaining 1 MHz I²C communication?

Yes - the device guarantees 1 MHz Fast-mode Plus operation across its full 1.6 V to 5.5 V supply range, as verified in Section 9 (DC and AC parameters) of DS14317 Rev 2. At 1.6 V, timing margins remain compliant with I²C specification, provided bus capacitance and pull-up strength meet design guidelines in Figures 24–25.

What happens if a write command targets the SWP register when the WPL bit is already set to 1?

When WPL = 1, the SWP register is frozen. The device acknowledges the device select and address bytes but returns NO ACK for the data byte, and the write cycle does not initiate. This behavior prevents unintended modification of write protection settings - ensuring memory security remains intact even if faulty firmware attempts reconfiguration.