Renesas M30042040108X0PSAY

Overview

M30042040108X0PSAY from Renesas is a 4Mb serial STT-MRAM non-volatile memory IC with QSPI interface, 108MHz SDR clock rate, 1.71–2.0V or 2.7–3.6V supply, and industrial-plus (−40°C to +105°C) temperature rating. It delivers SRAM-compatible read/write timing with persistent data retention, used in real-time industrial control logging and medical diagnostics firmware storage.

For engineers reviewing the M30042040108X0PSAY datasheet, M30042040108X0PSAY pinout, M30042040108X0PSAY application, or M30042040108X0PSAY equivalent, key selection considerations include its dual-voltage support, hardware/software write protection, 256-byte augmented storage array, JEDEC reset compliance, and 8-pad DFN (WSON) package compatibility with legacy SPI NOR footprint.

Technical Context

The M30042040108X0PSAY implements a 40nm pMTJ spin-transfer torque MRAM array with true random access, enabling byte-level reads/writes without erase cycles. Its QSPI interface supports 1-4-4 command-address-data configuration and both SDR (108MHz) and DDR (54MHz) modes using SPI Mode 0 or Mode 3 clocking.

It integrates hardware write protection via WP# pin and software-based block protection through configurable status register bits (BPSEL[2:0], TBSEL), plus dedicated registers for device ID (64-bit read-only), user serial number (64-bit programmable), and augmented storage array protection. Power management includes Deep Power Down (IDPD ≤ 10µA) and Hibernate modes with full configuration retention.

Key Specifications

Pinout & Package

8-pad DFN (WSON) package, 5.0mm × 6.0mm body, exposed thermal pad, moisture sensitivity level 3 (MSL3).

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 M30042040108X0PSAY uniquely combines 108MHz QSPI bandwidth, true byte-write non-volatility, 256-byte protected augmented storage, and industrial-plus temperature support - making it the sole option for high-throughput, mission-critical data logging in extended thermal environments.

Availability

M30042040108X0PSAY is available at Aetrix Electronics and suitable for industrial control logging, medical diagnostic firmware storage, factory automation configuration, network router boot image caching, and edge AI inference model parameter retention requiring stable component supply across multi-year production cycles.

Supply support for M30042040108X0PSAY 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 M30042040108X0PSAY belongs to Renesas' Persistent SRAM (P-SRAM) product line, designed specifically to replace battery-backed SRAM and legacy Flash/NOR in applications demanding instant-write non-volatility, high endurance, and deterministic timing.

FAQ

What voltage ranges does the M30042040108X0PSAY support?

The M30042040108X0PSAY supports two independent supply rails: 1.71V to 2.00V for 1.8V systems and 2.70V to 3.60V for 3.3V systems. Both ranges are fully characterized across the −40°C to +105°C operating temperature. The device automatically adapts internal regulation and timing - no external voltage translation or configuration is required when switching between rails.

Does the M30042040108X0PSAY require an external crystal or clock source?

No, the M30042040108X0PSAY is a slave device and requires only an external master-provided SPI clock signal on the CLK pin. It contains no internal oscillator or PLL; all timing is derived synchronously from the host's clock. The maximum supported frequency is 108MHz in SDR mode and 54MHz in DDR mode, with strict setup/hold timing specified in Tables 14–15 of the datasheet.

How is write protection implemented on the M30042040108X0PSAY?

The M30042040108X0PSAY implements dual-layer write protection: hardware-based via the WP# pin (active-low, requires external pull-down to enable) and software-based via status register bits (WP#EN, BPSEL[2:0], TBSEL). Both mechanisms must be configured correctly - for example, WP#EN=1 and WP#=low locks the status register, while BPSEL[2:0] defines protected memory blocks. The augmented storage array has separate protection bits per 32-byte section.

What is the purpose of the Augmented Storage Array in the M30042040108X0PSAY?

The 256-byte Augmented Storage Array in the M30042040108X0PSAY is a physically separate, user-programmable memory region with independent write protection. It is divided into eight 32-byte sections, each individually lockable. This area is intended for storing security-critical data such as calibration constants, cryptographic keys, or device-specific identifiers - isolated from main array operations to prevent accidental overwrite during firmware updates.

Can the M30042040108X0PSAY be used as a drop-in replacement for standard SPI NOR flash?

The M30042040108X0PSAY uses standard SPI command sets (e.g., 03h Read, 02h Page Program) and shares identical pinout and timing envelopes with many SPI NOR devices, enabling PCB layout reuse. However, it does not require erase commands before write, supports true byte-level writes, and offers vastly higher endurance. Firmware drivers must be updated to omit erase calls and leverage XIP mode for optimal performance - it is not a software-transparent replacement.