Renesas M10042040054X0ISAY

Overview

M10042040054X0ISAY from Renesas is a 4Mb serial STT-MRAM non-volatile memory IC with QSPI interface, 54MHz DDR timing, industrial temperature range (−40°C to +85°C), 8-pin SOIC package, and hardware/software write protection. It serves as persistent SRAM in real-time data logging systems requiring zero-write-latency and infinite endurance.

For engineers reviewing the M10042040054X0ISAY datasheet, M10042040054X0ISAY pinout, M10042040054X0ISAY application, or M10042040054X0ISAY equivalent, key selection criteria include its 1.71–2.0V/2.7–3.6V dual voltage support, 256-byte augmented storage array, JEDEC reset compliance, and quad-SPI x4 interface mode compatibility with legacy SPI controllers.

Technical Context

The M10042040054X0ISAY implements spin-transfer torque magnetoresistive RAM (STT-MRAM) on 40nm pMTJ technology, enabling true random access with SRAM-compatible read/write timing and inherent non-volatility. Its architecture supports Execute-In-Place (XIP), reducing command overhead during burst reads.

It operates in Quad SPI (4-4-4) mode with double data rate clocking at 54MHz, using both rising and falling edges of CLK for address/data transfer. The device integrates hardware write protection via WP# pin and software-based block protection through configurable status and configuration registers.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (5.2mm × 5.2mm), RoHS-compliant, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar non-volatile serial memory applications.

Compared with CY14V104N-SP25XI and FM25V05-G, the M10042040054X0ISAY provides higher density, QSPI DDR bandwidth, integrated hardware/software protection, and a dedicated 256-byte programmable section-making it optimal for new designs requiring scalable, future-proof non-volatile memory.

Availability

M10042040054X0ISAY is available at Aetrix Electronics and suitable for factory automation, medical diagnostics, and industrial control applications requiring stable component supply, long-term lifecycle assurance, and RoHS/REACH compliance.

Supply support for M10042040054X0ISAY 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

Renesas Electronics is a global semiconductor leader delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT markets.

The Mxxxx204 family was designed specifically to replace battery-backed SRAM and legacy nvSRAM in mission-critical industrial systems where data persistence, speed, and reliability cannot be compromised.

FAQ

What is the operating voltage range supported by M10042040054X0ISAY?

M10042040054X0ISAY supports two independent supply ranges: 1.71V to 2.00V for 1.8V systems and 2.70V to 3.60V for 3.3V systems. Both ranges are fully specified across the full industrial temperature range (−40°C to +85°C). The device contains internal regulation to maintain stable core operation regardless of selected VCC rail, and no external level shifters are required when interfacing with mixed-voltage microcontrollers.

Does M10042040054X0ISAY support Execute-In-Place (XIP) functionality?

Yes, M10042040054X0ISAY supports XIP mode, which allows sequential read operations without reissuing the READ command for each address. This reduces instruction overhead and improves effective read throughput during linear code or data fetches. XIP is enabled by sending a specific XIP byte (0xAxh) after the address in supported instruction sequences, and remains active until disabled with 0xFxh or until CS# goes high.

How is write protection implemented on M10042040054X0ISAY?

M10042040054X0ISAY implements dual-layer write protection: hardware-based via the WP# pin (active-low, disables status register writes when enabled) and software-based via configuration bits in the Status Register (BPSEL[2:0], TBSEL) and Configuration Registers. These allow selective locking of top/bottom memory blocks or individual 256-byte sectors in the augmented storage array-enabling secure firmware parameter storage without affecting main array writes.

What package type and footprint does M10042040054X0ISAY use?

M10042040054X0ISAY uses an 8-pin SOIC package (5.2mm × 5.2mm body, 1.27mm pitch), compliant with JEDEC MS-012. This footprint matches industry-standard SPI flash and EEPROM devices, enabling drop-in replacement in existing layouts without PCB revision. Pinout is identical to other members of the Mxxxx204 family, including M10042040108X0ISAY and M30042040054X0ISAY.

Is M10042040054X0ISAY compatible with standard SPI controllers?

Yes, M10042040054X0ISAY is fully compatible with standard SPI controllers supporting modes 0 (CPOL=0, CPHA=0) and mode 3 (CPOL=1, CPHA=1). It operates in Single SPI (1-1-1), Dual SPI (1-2-2), and Quad SPI (1-4-4 or 4-4-4) configurations. Standard SPI commands (READ, WRITE, WRSR, RDSR) are implemented, and the device responds to JEDEC reset (C0h), making integration seamless into existing firmware stacks without custom drivers.