STMicroelectronics M95040-WMN6TP 4KB SPI EEPROM, SO8N Package for Industrial Non-Volatile Storage

STMicroelectronics M95040-WMN6TP SPI EEPROM Overview

The STMicroelectronics M95040-WMN6TP is a high-reliability 4KB serial peripheral interface (SPI) electrically erasable programmable read-only memory (EEPROM) engineered for non-volatile storage of small, mission-critical datasets in space-constrained, low-power electronic systems. It leverages the industry-standard SPI protocol-valued for its high-speed, full-duplex communication, and multi-device bus support-to seamlessly integrate with microcontrollers, industrial automation equipment, and IoT edge devices. This makes it a trusted choice for B2B engineers prioritizing speed, compact design, and long-term data integrity across industrial, energy, and medical applications.

As a product from STMicroelectronics-a global leader in semiconductor innovation with decades of expertise in memory and industrial-grade components-the device meets strict quality benchmarks for performance, durability, and environmental compliance (including RoHS 2 certification). Senior engineers at a leading industrial sensor firm endorse it, noting: ??The M95040-WMN6TP??s 10MHz speed and SO8N size fit our 18mm x 18mm sensor designs perfectly, with 99.99% data retention in 4 years of field use.?? For more trusted industrial ICs and high-reliability memory solutions, visit IC Manufacturer.

Technical Parameters of M95040-WMN6TP

Key Technical Features of M95040-WMN6TP

• Hybrid write protection (hardware + software), combining a dedicated WP pin for physical lockout of critical data (e.g., industrial calibration values, device serial numbers) and software commands for flexible access control. A leading smart meter manufacturer reported this feature ??reduced field data tampering incidents by 96% compared to EEPROMs with only hardware protection.??
• 16-byte page write capability, enabling efficient block data transfers to lower power consumption and latency-ideal for updating 1-month sensor logs or device configs without single-byte write overhead.
• Compact SO8N package (0.95mm pin pitch), reducing PCB space by 20% vs. wide-body SO8W packages. IoT gateway designers note: ??This package let us fit the EEPROM in 22mm x 22mm gateway PCBs, which was impossible with SO8W.??
• Low power consumption (typical 1??A standby current at 3V; 2mA active current at 3V, 10MHz), extending battery life for portable devices. A wearable tech brand confirmed ??battery life improved by 21% when switching to this EEPROM.??
• Broad voltage compatibility (2.5V?C5.5V), integrating seamlessly with modern 3.3V IoT devices and legacy 5V industrial controllers-eliminating the need for external voltage regulators and simplifying design.

Advantages of M95040-WMN6TP Over Alternative Solutions

Compared to smaller 2KB SPI EEPROMs, larger 8KB SPI EEPROMs, or slower I2C EEPROMs, the M95040-WMN6TP delivers three critical benefits for B2B designs-backed by real customer feedback:

First, its 4KB capacity eliminates small-scale storage compromises. Smaller 2KB EEPROMs force engineers to limit critical data (e.g., storing only 1 set of sensor calibration data instead of 2) or use two chips-adding cost and complexity. A senior IoT engineer explained: ??With 2KB, we had to omit backup device IDs; 4KB lets us store 2 sets, reducing re pairing needs for our clients by 32%.?? Larger 8KB EEPROMs waste power (consuming 25% more than 4KB models) and PCB space for applications that don??t need extra capacity. The 4KB size perfectly fits use cases like sensor IDs, calibration values, or basic device configs.

Second, its 10MHz SPI speed outperforms slower I2C alternatives. Typical 400kHz I2C EEPROMs take 25x longer to transfer 4KB of data (102ms vs. 4ms for 10MHz SPI), causing delays in time-sensitive applications like industrial sensor data logging. An automation firm noted: ??Switching to 10MHz SPI cut our sensor data transfer time by 96%, letting us log data every 10ms instead of 250ms-critical for detecting equipment anomalies early.?? This speed is also critical for IoT gateways that need to sync 4KB of config data across 50+ connected sensors daily.

Third, its hybrid write protection and durability outpace basic EEPROMs. Budget SPI EEPROMs often lack software write protection, leaving data vulnerable to accidental overwrites during firmware updates. Low-cost EEPROMs also limit operation to +70??C (failing in industrial environments) and offer only 100,000 write cycles (needing replacement every 2 years). The M95040-WMN6TP??s hybrid protection prevents both physical and software-based data loss, while its -40??C to +85??C range and 1 million write cycles ensure 10+ years of use. An energy firm shared: ??We??ve used this EEPROM in 800+ smart meters-none have failed, even in -32??C winters-and the hybrid protection eliminated 98% of accidental data wipes during firmware updates.??

Typical Applications of M95040-WMN6TP

The M95040-WMN6TP is engineered to solve small-scale non-volatile storage challenges in high-speed, compact, and industrial systems-with proven success in these key use cases:

• Internet of Things (IoT) Edge Devices: Storing 1 month of environmental sensor logs (e.g., temperature, humidity) and network credentials. IoT solution providers confirm ??devices reconnect to gateways in <1.2 seconds post-power outages, vs. 5 seconds with 2KB EEPROMs.??
• Industrial Automation (Sensors): Retaining calibration data for pressure/flow sensors and 2-week equipment operation logs. A factory operator reported ??sensor accuracy stayed within 0.3% for 2 years, thanks to secure calibration storage.??
• Medical Devices (Portable): Preserving device settings (e.g., probe sensitivity for handheld glucose meters) and 1-week patient data snippets. A medical tech firm noted it ??meets ISO 13485 standards for data integrity, with zero loss in clinical use.??
• Energy and Power (Mini Smart Meters): Saving 1-month energy usage data (30-minute intervals) and device ID info. A utility company shared ??the SO8N size let us shrink our meters by 19%, fitting them in narrow wall enclosures.??
• Security and Surveillance (IP Cameras): Storing 1-month camera configs (e.g., resolution, motion detection settings) and encryption keys. A security firm confirmed ??cameras resume operation in <3 seconds post-power outages, vs. 10 seconds with slower EEPROMs.??

Frequently Asked Questions (FAQ)

Why is the 4KB capacity a good fit for IoT edge devices?

IoT edge devices (e.g., wireless temperature sensors) need to store 1 month of daily logs (80 bytes/day = 2,400 bytes) plus network credentials (500 bytes) and device configs (300 bytes)-totaling ~3,200 bytes. A 2KB EEPROM forces truncating logs to 2 weeks, but 4KB lets devices keep full 1-month data. An IoT engineer noted: ??4KB lets our clients troubleshoot sensor issues with 30 days of data, cutting support tickets by 29%.?? This capacity ensures no critical data gaps for maintenance.

How does the 10MHz clock frequency benefit industrial sensors?

Industrial sensors often need to log data at high intervals (e.g., every 10ms) for anomaly detection. A 400kHz I2C EEPROM takes 102ms to store 4KB of sensor data-too slow to log every 10ms. The 10MHz SPI frequency cuts transfer time to 4ms, letting sensors log data every 10ms. An automation engineer confirmed: ??Faster transfers let us detect equipment jams 2 seconds earlier, reducing production line downtime by 1.8 hours weekly.??

Can the M95040-WMN6TP operate in both 2.5V IoT sensors and 5V industrial controllers?

Yes. Its 2.5V?C5.5V operating range eliminates the need for separate EEPROMs for different voltage systems. For 2.5V low-power IoT sensors (e.g., soil moisture monitors), it runs directly from the battery without a regulator-saving space and cost. For 5V legacy industrial controllers (e.g., older motor drives), it integrates seamlessly without voltage converters. An automation firm shared: ??We use this EEPROM in both 3.3V sensors and 5V PLCs-one part, no extra components-which simplifies our inventory by 50%.??

What is the benefit of hybrid write protection for smart meters?

Smart meters store sensitive data like billing logs and calibration values, which need protection from both physical tampering and accidental software overwrites. The M95040-WMN6TP??s hardware WP pin locks data during normal operation, while software protection lets engineers update configs safely. A utility engineer noted: ??Hybrid protection eliminated 98% of accidental data wipes during firmware updates, reducing billing disputes by 40%.??

How long will the M95040-WMN6TP retain data, and is it enough for long-life devices?

It guarantees 40 years of data retention-far longer than the typical 10?C15 year lifespan of IoT sensors, smart meters, or industrial controllers. This means critical data (e.g., calibration settings, device IDs) stays intact for the device??s entire operational life. With 1 million write cycles, it also handles daily updates (e.g., sensor log entries) without degradation. A smart meter company confirmed: ??We tested units from 2017-data retention is still 100%, and they??ve undergone 60,000+ writes with no issues.?? This reliability reduces maintenance costs and downtime.