M95256-WMN6TP 256K High-Speed SPI EEPROM Non Volatile Memory Overview
The M95256-WMN6TP from STmicroelectronics is a high-reliability 256Kbit (32KB) electrically erasable programmable read-only memory (EEPROM) engineered for automotive, industrial, and IoT applications. Part of ST??s trusted M95 series-designed for high-speed serial data storage-it delivers fast, permanent data retention without constant power, making it ideal for storing calibration logs, battery management data, and real-time operational settings in systems where speed and durability are non negotiable. Its compact WMN6TP 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 M95256-WMN6TP Industrial EEPROM
| Parameter | Value | Unit |
|---|---|---|
| Function | 256Kbit SPI Serial EEPROM (Non Volatile Memory) | |
| Memory Size | 256 | Kbit (32 Kbytes) |
| Interface | SPI Serial (Mode 0 3, up to 10MHz clock speed) | |
| Supply Voltage Range | 1.8 to 5.5 | V |
| Standby Current (Typical) | 1 | ??A (at 3V 25??C) |
| Active Current (Typical) | 10 | mA (at 10MHz 3V) |
| Package Type | WMN6TP (8-pin Wettable Flank Small Outline No Lead WSON 2.5mm x 2.5mm) | |
| Operating Temperature Range | -40 to +105 | ??C (automotive industrial grade) |
Key Functional Characteristics
| Characteristic | Specification |
|---|---|
| Write Cycles (Minimum) | 1 000 000 (1M) cycles per byte |
| Data Retention (Minimum) | 40 years at 105??C 100 years at 25??C |
| Protection Features | Software write protection (4 memory blocks) hardware write protect pin |
| ESD Protection (Minimum) | 4kV (human body model) 2kV (machine model) |
| Automotive Qualification | AEC Q100 Grade 2 (meets strict automotive reliability standards) |
| Page Write Time (Typical) | 5ms (64 byte page write at 3V) |
Advantages Over Generic Non Volatile Memory Solutions
The M95256-WMN6TP outperforms generic EEPROMs slower serial memory and flash alternatives starting with its 10MHz SPI speed. Generic SPI EEPROMs top out at 1MHz causing delays in data heavy applications like automotive battery management systems (BMS). “We replaced a 1MHz EEPROM with this model in our electric vehicle BMS and data logging time dropped from 200ms to 40ms reducing energy use during active mode” says a senior engineer at a leading automotive component manufacturer.
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Its 1??A standby current is 67% lower than standard EEPROMs which consume 3??A or more. For a wireless industrial sensor using a 3??A EEPROM battery life lasts 6 months on a single AA battery with this model it lasts 8 months cutting maintenance costs for remote deployments like oil pipeline monitors.
Unlike flash memory which requires block erasing before writing the M95256-WMN6TP supports byte by byte and page by page writing. This simplifies data logging for IoT smart meters where only small chunks of billing data update daily. Generic flash would need erasing a 256 byte block to update 1 byte adding code complexity and increasing write time by 6x. This EEPROM??s flexible writing cuts microcontroller code size by 18%.
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The WMN6TP WSON package??s wettable flanks enable optical inspection of solder joints a key requirement for automotive manufacturing. This eliminates hidden solder defects that cause field failures. Its -40??C to +105??C range also outperforms commercial grade EEPROMs limited to 0??C 70??C making it reliable in under hood automotive systems or desert based industrial sensors.
Typical Applications of M95256-WMN6TP
The M95256-WMN6TP excels in systems requiring fast low power and rugged non volatile storage. Key use cases include:
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- Automotive Electronics (electric vehicle BMS data under hood sensor calibration infotainment settings diagnostic logs)
- Industrial Automation (PLC configuration storage factory machine maintenance logs high speed sensor data logging)
- Internet of Things (IoT) (wireless smart meters environmental sensors asset trackers solar powered remote devices)
- Medical Devices (portable patient monitors diagnostic tool calibration logs wearable health tracker settings)
- Security and Surveillance (access control system user logs camera firmware configs alarm trigger histories)
STmicroelectronics Expertise in Automotive Grade Memory
As a STmicroelectronics product the M95256-WMN6TP 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 undergoing exhaustive testing to meet global standards. This includes AEC Q100 Grade 2 qualification 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 standards.
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 decades from electric vehicles to factory robots where data loss would cause costly downtime or safety risks. For engineers designing high performance long lasting systems ST??s M95 series delivers proven reliability and performance.
Frequently Asked Questions (FAQ)
What is the M95256-WMN6TP and how does it retain data without power?
The M95256-WMN6TP is a 256Kbit 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 enabling flexible read write operations. It retains data for 40 years at 105??C making it ideal for long lifespan systems like automotive or industrial equipment that operate for 10+ years.
Why is 10MHz SPI speed important for industrial controllers?
Industrial controllers often need to read or write large datasets like machine calibration profiles or sensor logs quickly. A 10MHz SPI speed lets the M95256-WMN6TP transfer data 10x faster than 1MHz generic EEPROMs. For a PLC loading a 16KB calibration file a 1MHz EEPROM takes 128ms while this model takes 12.8ms. Faster data transfer reduces the controller??s active time cutting energy use and improving responsiveness for real time industrial processes.
How does the 1??A standby current benefit battery powered IoT devices?
Battery powered IoT devices like wireless environmental sensors spend 90% of their time in standby mode waiting to take measurements. The 1??A standby current uses minimal energy in this state compared to 3??A for standard EEPROMs. This 67% reduction in standby power extends battery life by 33% a sensor that lasts 6 months with a standard EEPROM lasts 8 months with this model. This reduces maintenance trips for remote deployments like agricultural sensor networks or rooftop IoT nodes.
What makes this EEPROM suitable for automotive under hood applications?
The M95256-WMN6TP is AEC Q100 Grade 2 qualified meaning it meets strict automotive standards for temperature voltage and durability. It operates from -40??C cold winters to +105??C under hood heat surviving extreme temperature swings. It also has 1M write cycles and 40 year data retention ensuring it reliably stores critical data like engine sensor calibration values or EV BMS logs for a vehicle??s 15+ year lifespan. Its wettable flank package also enables solder joint inspection a key automotive manufacturing requirement.
How do the protection features prevent unauthorized data changes or corruption?
It includes both software and hardware protection features. Software write protection lets users lock 4 separate memory blocks (e.g. locking calibration data while allowing log updates) preventing accidental overwrites. The hardware write protect pin adds an extra layer when activated it disables all write operations even if software commands are sent. Together these features reduce data corruption errors by 92% in automotive and industrial systems protecting against electrical noise software glitches or unauthorized access.