Renesas M10042040054X0PWAR

Overview

M10042040054X0PWAR from Renesas is a 4Mb serial STT-MRAM non-volatile memory IC with Quad SPI (QSPI) interface, 54MHz double data rate operation, 1.71–2.0V supply voltage, and industrial-plus temperature range (−40°C to +105°C). It delivers SRAM-compatible read/write timing, zero write latency, and persistent data retention without backup power-used in real-time industrial control logging and medical diagnostic data buffering.

For engineers reviewing the M10042040054X0PWAR datasheet, M10042040054X0PWAR pinout, M10042040054X0PWAR application, or M10042040054X0PWAR equivalent, key selection criteria include QSPI DDR timing compliance, hardware/software write protection, 256-byte augmented storage array programmability, and WSON-8 package compatibility with legacy SPI NOR footprint.

Technical Context

The M10042040054X0PWAR implements a 40nm pMTJ spin-transfer torque MRAM core with true random access, enabling byte-level writes without erase cycles. Its command architecture supports QPI (4-4-4), DPI (2-2-2), and SDR/DDR modes via configurable clock edge sampling (rising/falling for DDR).

It integrates dual protection layers: hardware write protect (WP# pin) active in single-SPI mode, and software-configurable block protection (BP[2:0]) and top/bottom selection (TBSEL) via status register. The 256-byte augmented storage array operates independently of main memory and supports per-section write protection.

Key Specifications

Pinout & Package

Package: 8-pad DFN (WSON), 5.0mm × 6.0mm, moisture sensitivity level 3, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FM25V04-G and W25Q40EW, the M10042040054X0PWAR uniquely combines DDR QPI bandwidth, true byte-write capability, and 256-byte protected auxiliary storage-making it optimal for deterministic real-time logging and secure configuration in extended-temperature industrial systems.

Availability

M10042040054X0PWAR is available at Aetrix Electronics and suitable for industrial control logging, medical diagnostic buffering, and network equipment configuration storage requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for M10042040054X0PWAR 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 family was designed as persistent SRAM (P-SRAM) replacements-delivering non-volatility without sacrificing SRAM-like performance, targeting applications where data integrity, speed, and endurance outweigh cost-per-bit concerns.

FAQ

What is the maximum clock frequency supported by M10042040054X0PWAR in Double Data Rate mode?

The M10042040054X0PWAR supports up to 54MHz in Double Data Rate (DDR) mode, achieving an effective data rate of 432Mbps by sampling on both clock edges. This is confirmed in the "Features" section of the datasheet and validated in Table 4 for QPI (4-4-4) DDR operation. The 54MHz DDR rating is specific to the M10042040054X0PWAR variant, distinguishing it from the 108MHz SDR variants in the same family.

Does M10042040054X0PWAR require external hardware for write protection?

Yes-M10042040054X0PWAR supports hardware write protection via the WP# pin, which must be actively driven (not left floating) to enable status register locking in Single SPI mode. The datasheet specifies that WP# has no internal pull-up and requires external biasing. When WP# is low and the WP#EN bit (SR[7]) is set, the status register becomes read-only. This hardware lock complements software-based block protection configured through the status register.

Can M10042040054X0PWAR operate in Execute-In-Place (XIP) mode, and what is its benefit?

Yes-M10042040054X0PWAR supports eXecute-In-Place (XIP) mode, allowing continuous instruction fetches without repeating the read command for each access. As stated in Section 6, XIP reduces command overhead and cuts random read latency by eliminating per-access command phases. This is especially valuable for microcontrollers running real-time control loops directly from MRAM, where deterministic timing is critical-and the M10042040054X0PWAR's SRAM-compatible timing makes XIP viable without cache coherency logic.

What is the purpose and size of the Augmented Storage Array in M10042040054X0PWAR?

The Augmented Storage Array in M10042040054X0PWAR is a dedicated 256-byte memory region independent of the main 4Mb array, divided into eight 32-byte sections. Each section can be individually programmed and write-protected. Its design purpose-stated in Section 9-is to store sensitive or infrequently updated data such as cryptographic keys, device serial numbers, or calibration constants. Unlike main array writes, augmented array writes do not affect endurance metrics for the primary memory space.

Is M10042040054X0PWAR pin-compatible with standard 8-pin SOIC SPI flash devices?

No-M10042040054X0PWAR uses an 8-pad DFN (WSON) package (5.0mm × 6.0mm) per Section 4.1, not SOIC. While the pin count and signal names (CS#, CLK, IO[0]–IO[3], VCC, VSS) match industry-standard SPI footprints, the WSON-8 land pattern differs mechanically from SOIC-8. The datasheet explicitly lists WA (WSON) and SA (SOIC) as separate package options; M10042040054X0PWAR's suffix "WA" confirms WSON packaging. PCB layout must use the WSON-8 footprint, not SOIC-8.