Renesas M10042040108X0IWAY

Overview

M10042040108X0IWAY from Renesas is a 4Mb serial STT-MRAM non-volatile memory IC with QSPI interface, 108MHz SDR operation, 1.71–2.0V supply, industrial temperature range (−40°C to +85°C), and 8-pad DFN (WSON) package. It serves as persistent SRAM replacement in real-time data logging systems requiring zero-write-latency, infinite endurance, and instant power-loss resilience.

For engineers reviewing the M10042040108X0IWAY datasheet, M10042040108X0IWAY pinout, M10042040108X0IWAY application, or M10042040108X0IWAY equivalent, key selection criteria include QSPI x4 timing compliance, hardware/software write protection granularity, 256-byte augmented storage array programmability, and deep power-down exit time under 400 µs.

Technical Context

The M10042040108X0IWAY implements a 40nm pMTJ spin-transfer torque MRAM array with true random access, supporting Quad SPI (4-4-4) command/address/data transfer and Execute-In-Place (XIP) mode to eliminate per-access command overhead. Its architecture integrates dual power domains (1.8V core/I/O), on-die voltage regulation, and configurable status/configuration registers for fine-grained memory protection.

It operates exclusively in Single Data Rate (SDR) mode at 108MHz using SPI Mode 0 (CPOL=0, CPHA=0), latching commands/addresses on rising CLK edge and outputting data on falling edge. The device supports two low-power states-Deep Power Down (IDPD) and Hibernate-with full configuration retention and sub-5µs entry/exit latency.

Key Specifications

Pinout & Package

8-pad DFN (WSON) package, 5.0 mm × 6.0 mm, exposed thermal pad, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FM25V05 and CY14B104N, the M10042040108X0IWAY delivers 8× higher bandwidth, 1000× greater density scalability, and seamless drop-in replacement for QSPI-based microcontrollers - without requiring layout changes or driver modifications.

Availability

M10042040108X0IWAY is available at Aetrix Electronics and suitable for industrial PLC data logging, medical imaging buffers, and network equipment configuration stores requiring stable component supply, long-term lifecycle assurance, and RoHS/REACH compliance.

Supply support for M10042040108X0IWAY 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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.

The Mxxxx204 product line was designed specifically to replace battery-backed SRAM and serial Flash in mission-critical industrial systems where data persistence, speed, and reliability cannot be compromised.

FAQ

What is the operating voltage range for M10042040108X0IWAY?

The M10042040108X0IWAY operates from 1.71 V to 2.00 V. This 1.8 V nominal supply range ensures compatibility with modern low-power microcontrollers and FPGAs while maintaining robust noise margins. Operation outside this range may cause undefined behavior or data corruption. The device does not support 3.0 V operation - that variant is designated with suffix '3' (e.g., M10042040108X0IWA3).

Does M10042040108X0IWAY support Double Data Rate (DDR) mode?

No, the M10042040108X0IWAY supports only Single Data Rate (SDR) mode at 108 MHz. Although the datasheet references DDR capability for other variants in the family (e.g., those with '0054' speed grade), this specific part number is rated and characterized exclusively for SDR operation using SPI Mode 0 (CPOL=0, CPHA=0). Attempting DDR commands will result in invalid responses.

How is write protection implemented on M10042040108X0IWAY?

M10042040108X0IWAY implements dual-layer write protection: hardware-based via the WP# pin (enabling status register lock when asserted low), and software-based via configuration bits in the Status Register (BPSEL[2:0], TBSEL, SNPEN). Both mechanisms must be configured correctly to protect main memory, augmented storage, or serial number fields - critical for preventing accidental firmware overwrite in deployed systems.

What is the purpose of the 256-byte Augmented Storage Array in M10042040108X0IWAY?

The 256-byte Augmented Storage Array in M10042040108X0IWAY provides a dedicated, independently programmable and write-protectable region for storing device-specific data such as calibration coefficients, MAC addresses, or cryptographic keys. It is divided into eight 32-byte sections, each individually lockable - enabling field-upgradable parameters without risking corruption of main application memory.

Can M10042040108X0IWAY retain data during deep power-down mode?

Yes, M10042040108X0IWAY retains all stored data and register configurations during Deep Power Down mode. With typical current draw below 1 µA and exit time ≤400 µs, it enables ultra-low-power operation in battery-powered or energy-harvesting systems while guaranteeing zero data loss - a key advantage over volatile memories requiring backup power sources.