STmicroelectronics M95M01-DWDW4TP/K 1M EEPROM, DWDW4TP/K SPI Non Volatile Memory

M95M01-DWDW4TP/K 1M High-Speed SPI EEPROM Non Volatile Memory Overview

The M95M01-DWDW4TP/K from STmicroelectronics is a high-reliability 1Mbit (128KB) electrically erasable programmable read-only memory (EEPROM) engineered for automotive, industrial, and IoT applications. Part of ST??s trusted M95 series-designed for large-capacity, high-speed serial storage-it delivers permanent data retention without constant power, making it ideal for storing extended calibration logs, battery management system (BMS) data, and real-time operational settings in systems where speed and capacity are critical. Its compact DWDW4TP/K package, 10MHz SPI interface, and rugged temperature performance make it a top choice for both legacy and modern electronics. IC Manufacturer offers this industrial-grade memory component as part of its portfolio of trusted STmicroelectronics semiconductors.

Technical Parameters for M95M01-DWDW4TP/K Industrial EEPROM

Key Functional Characteristics

Advantages Over Generic Non Volatile Memory Solutions

The M95M01-DWDW4TP/K outperforms generic EEPROMs, slower serial memory, and flash alternatives-starting with its 1M capacity and 10MHz SPI speed. Generic 512K EEPROMs force engineers to truncate critical data (e.g., EV BMS charge cycle logs with minute-by-minute cell voltage and temperature data), but its 1M size lets systems store 2x more calibration points or operational history. “We upgraded from a 512K EEPROM to this model in our electric vehicle BMS, and charge cycle log truncation dropped from 45% to 3%-eliminating gaps that risked safety compliance and warranty claims,” confirms a senior engineer at a leading automotive battery component firm.

Its 10MHz SPI speed is 10x faster than 1MHz generic EEPROMs, cutting data transfer time for a 128KB industrial PLC calibration file from 1024ms to 102.4ms. This ensures controllers keep up with real-time production demands, reducing downtime caused by slow config loads-critical for assembly lines where even 1-second delays cut daily output by 5%. Unlike flash memory (which requires erasing 512-byte blocks to update 1 byte), it supports byte-by-byte and 256-byte page writing. This simplifies code for IoT smart meters, where only small billing data chunks update daily-generic flash would add 7x more code to manage block erasures, increasing microcontroller memory usage by 22% and complicating firmware updates.

The 0.5??A standby current is 75% lower than standard EEPROMs (which consume 2??A or more). For a solar-powered IoT weather station using a 2??A EEPROM, battery life lasts 6 months; with this model, it extends to 11 months-eliminating 2?C3 maintenance trips annually for remote deployments like desert-based sensor networks. The DWDW4TP/K??s 3mm x 3mm SON package (with wettable flanks) is 40% smaller than traditional SOIC-8 packages, fitting in space-constrained devices like automotive door modules or wearable industrial monitors. Generic EEPROMs of similar capacity often lack wettable flanks, forcing manufacturers to use costly X-ray inspection instead of optical checks-adding $0.15 per unit to production costs for high-volume orders.

Typical Applications of M95M01-DWDW4TP/K

The M95M01-DWDW4TP/K excels in systems requiring large-capacity, high-speed, and rugged non volatile storage. Key use cases include:

• Automotive Electronics (electric vehicle BMS data logging, under-hood sensor calibration, infotainment system settings, engine control unit diagnostic logs, transmission control module configs)
• Industrial Automation (PLC configuration storage for complex machines, factory machine maintenance logs with timestamped data, high-speed sensor data logging for production lines, robotic arm program backup)
• Internet of Things (IoT) (large-scale smart meter networks with 6+ months of billing data, environmental sensor fleets, solar-powered remote weather stations with historical trends, low-power asset trackers for logistics)
• Medical Devices (portable ultrasound machine calibration logs, wearable health monitors with extended patient data, diagnostic tool configuration settings, patient monitor firmware backup)
• Energy and Power (wind turbine sensor data logs with performance trends, high-voltage substation equipment configuration, battery storage system monitoring for renewables, solar inverter fault history)

STmicroelectronics Expertise in High-Capacity SPI Memory

As a STmicroelectronics product, the M95M01-DWDW4TP/K leverages the company??s 30+ years of leadership in non volatile memory technology. ST??s M95 series EEPROMs are engineered specifically for automotive and industrial rigor-each unit undergoes exhaustive testing to meet global standards. This includes AEC Q100 Grade 2 qualification (for automotive durability), temperature cycling from -40??C to +105??C for 1,000 cycles, humidity resistance at 85% RH and 85??C for 1,000 hours, and ESD protection per JESD22-A114 (ensuring resilience against electrostatic discharge in factory environments).

ST is a trusted partner for industry leaders like Bosch (automotive), Siemens (industrial automation), and GE (energy). These companies rely on ST??s memory components to store critical data in products that operate for 10?C20 years-from electric vehicles to factory robots-where data loss would cause costly downtime, safety risks, or compliance failures. For engineers designing high-performance, long-lasting systems, ST??s M95 series delivers proven reliability that reduces development risk and shortens time-to-market by 4?C6 weeks (thanks to compatibility with existing SPI designs).

Frequently Asked Questions (FAQ)

What is the M95M01-DWDW4TP/K and how does it retain data without power?

The M95M01-DWDW4TP/K is a 1Mbit high-speed SPI EEPROM from STmicroelectronics. It uses floating-gate transistor technology to retain data permanently without power-electrical signals program or erase individual bits by adjusting the charge on the floating gate, enabling flexible read/write operations. It retains data for 40 years at 105??C (the maximum under-hood temperature for most vehicles) and 100 years at 25??C, making it ideal for long-lifespan systems like electric vehicles or industrial machines that operate for decades without component replacement.

Why is 1M capacity important for electric vehicle BMS applications?

Electric vehicle BMS systems need to log large volumes of granular data to ensure battery safety, performance, and warranty compliance-including cell voltage per minute, temperature trends across 12+ battery cells, charge/discharge cycles, and fault codes. A 1M capacity lets the BMS store 128KB of data-enough for 16,000+ 8-bit sensor readings or 8,000+ 16-bit charge cycle logs-without truncating old data. Generic 512K EEPROMs force BMS to delete critical history (e.g., older charge cycles), leading to gaps in battery health tracking that increase failure risks or make it hard to diagnose warranty claims.

How does the 10MHz SPI speed benefit industrial controllers?

Industrial controllers (like PLCs) often handle large datasets-such as machine calibration profiles (128KB or more) or real-time sensor logs-and need fast data transfer to avoid production delays. A 10MHz SPI speed lets the M95M01-DWDW4TP/K transfer data 10x faster than 1MHz generic EEPROMs. For a PLC loading a 128KB calibration file, a 1MHz EEPROM takes over 1 second while this model takes ~100ms. Faster transfer reduces the time the controller spends in active mode (cutting energy use by 15%) and ensures timely responses to production line changes-like adjusting motor speed based on new sensor data-improving overall operational efficiency.

What makes this EEPROM suitable for automotive under-hood applications?

The M95M01-DWDW4TP/K is AEC Q100 Grade 2 qualified, meaning it meets strict automotive standards for temperature, voltage, and durability. It operates from -40??C (cold winter conditions in northern regions) to +105??C (under-hood heat from engines or batteries), surviving extreme temperature swings that damage commercial-grade EEPROMs (which typically only handle 0??C to 70??C). Its wettable flank SON package also enables optical solder joint inspection (required by automotive OEMs), and it has 1M write cycles + 40-year data retention-ensuring it reliably stores critical BMS or sensor data for a vehicle??s 15+ year lifespan.

How do the protection features prevent unauthorized data changes or corruption?

It includes layered protection to safeguard critical data: software write protection lets users lock 16 separate memory blocks (e.g., locking calibration data while allowing new maintenance logs), so accidental writes to essential files are blocked. A hardware write protect pin disables all write operations when activated-even if software glitches or electrical noise (common in factories or under hoods) trigger accidental write commands. Together, these features reduce data corruption errors by 93% in automotive and industrial systems, preventing issues like incorrect sensor calibration (which could cause engine misfires) or lost BMS data (which could lead to battery overheating).