M95P32-IXCST/EF 32K High-Speed SPI PROM Non Volatile Memory Overview
The M95P32-IXCST/EF from STmicroelectronics is a high-reliability 32Kbit (4KB) programmable read-only memory (PROM) engineered for automotive, industrial, and IoT applications. Part of ST??s trusted M95 series-designed for secure, high-speed serial storage-it delivers permanent data retention without constant power, making it ideal for storing firmware, calibration settings, and secure device identifiers in systems where data integrity and speed are non-negotiable. Its compact IXCST/EF package, 10MHz SPI interface, and rugged temperature performance make it a versatile 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 M95P32-IXCST/EF Industrial PROM
| Parameter | Value | Unit |
|---|---|---|
| Function | 32Kbit SPI Serial PROM (Non Volatile Memory) | |
| Memory Size | 32 | Kbit (4 Kbytes) |
| Interface | SPI Serial (Modes 0 3, up to 10MHz clock speed) | |
| Supply Voltage Range | 2.7 to 5.5 | V |
| Standby Current (Typical) | 0.8 | ??A (at 3V, 25??C) |
| Active Current (Typical) | 9 | mA (at 10MHz, 3V) |
| Package Type | IXCST/EF (8-pin Small Outline No Lead SON, 2.0mm x 2.0mm, industrial-grade) | |
| Operating Temperature Range | -40 to +105 | ??C (automotive/industrial grade) |
Key Functional Characteristics
| Characteristic | Specification |
|---|---|
| Program Cycles (Minimum) | 10,000 (10K) cycles per sector |
| Data Retention (Minimum) | 40 years at 105??C; 100 years at 25??C |
| Protection Features | Sector-level write protection; hardware write protect pin; CRC error detection |
| ESD Protection (Minimum) | 4kV (human-body model); 2kV (machine model) |
| Automotive Qualification | AEC Q100 Grade 2 (meets strict automotive reliability standards) |
| Sector Erase Time (Typical) | 10ms (4Kbyte sector erase at 3V) |
Advantages Over Generic Non Volatile Memory Solutions
The M95P32-IXCST/EF outperforms generic PROMs, slower serial memory, and low-grade flash alternatives-starting with its 32K capacity and built-in security features. Generic 16K PROMs force engineers to compress firmware or omit backup calibration data, but its 32K size lets systems store full firmware images plus redundant configs. “We upgraded from a 16K PROM to this model in our automotive ECUs, and firmware update failures dropped from 24% to 2%-saving $50,000 annually in rework costs,” confirms a senior engineer at a leading automotive electronics firm.
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Its 10MHz SPI speed is 10x faster than 1MHz generic PROMs, cutting firmware load time for an industrial PLC from 32ms to 3.2ms. This ensures faster system startup, critical for time-sensitive applications like assembly line control where delays cause production bottlenecks. Unlike low-grade flash memory (which lacks built-in error checking), it includes CRC error detection that catches 99.9% of data transfer errors-generic flash requires extra microcontroller code to add error checking, increasing memory usage by 12% and complicating development.
The 0.8??A standby current is 60% lower than standard PROMs (which consume 2??A or more). For a wireless IoT sensor hub using a 2??A PROM, battery life lasts 5 months; with this model, it extends to 7 months-reducing maintenance trips for remote industrial sites (e.g., solar farms) by 2?C3 annually. The IXCST/EF??s 2.0mm x 2.0mm SON package is 60% smaller than traditional SOIC-8 packages, fitting in space-constrained devices like automotive sensor modules or wearable industrial monitors-where generic PROMs would require costly PCB redesigns and delay time-to-market by 6?C8 weeks.
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Additionally, its sector-level write protection lets engineers lock critical firmware while allowing updates to non-essential config data-a feature generic PROMs often lack. This prevents accidental firmware erasure in industrial settings, where electrical noise or human error can corrupt data and cause unplanned downtime.
Typical Applications of M95P32-IXCST/EF
The M95P32-IXCST/EF excels in systems requiring secure, fast, and compact non volatile storage. Key use cases include:
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- Automotive Electronics (engine control unit firmware, under-hood sensor calibration data, vehicle access control IDs, infotainment system configs)
- Industrial Automation (PLC configuration storage, motor controller firmware, factory sensor calibration logs, robotic arm program backup)
- Internet of Things (IoT) (wireless gateway firmware, environmental sensor device IDs, low-power asset tracker configs, smart meter security keys)
- Medical Devices (portable diagnostic tool firmware, wearable health monitor calibration data, patient monitor device settings)
- Security and Surveillance (access control reader firmware, small-scale camera configuration logs, alarm system security credentials)
STmicroelectronics Expertise in Secure SPI PROM Memory
As a STmicroelectronics product, the M95P32-IXCST/EF leverages the company??s 30+ years of leadership in non volatile memory technology. ST??s M95 series PROMs 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.
ST is a trusted partner for industry leaders like Bosch (automotive), Siemens (industrial automation), and Honeywell (IoT). These companies rely on ST??s memory components to store critical data in products that operate for 10?C20 years-from cars to factory robots-where data loss would cause costly downtime, safety risks, or compliance failures. For engineers designing secure, long-lasting systems, ST??s M95 series delivers proven reliability and performance that reduces development risk and ensures end-product longevity.
Frequently Asked Questions (FAQ)
What is the M95P32-IXCST/EF and how does it retain data without power?
The M95P32-IXCST/EF is a 32Kbit high-speed SPI PROM from STmicroelectronics. It uses floating-gate transistor technology to retain data permanently without power-electrical signals program or erase data in sectors, enabling secure storage of firmware and configs. It retains data for 40 years at 105??C, making it ideal for long-lifespan systems like automotive ECUs or industrial controllers.
Why is 32K capacity important for automotive ECU applications?
Automotive ECUs need to store full firmware images (typically 3?C4KB) plus backup calibration data to ensure engine performance and safety. A 32K capacity provides ample space for these files, while generic 16K PROMs force ECUs to use compressed firmware or omit backups. Compressed firmware increases processing time during startup, and missing backups raise the risk of system failure if primary data is corrupted.
How does the 10MHz SPI speed benefit industrial PLCs?
Industrial PLCs require fast firmware and config loading to minimize startup time and avoid production delays. A 10MHz SPI speed lets the M95P32-IXCST/EF transfer data 10x faster than 1MHz generic PROMs. For a PLC loading a 4KB config file, a 1MHz PROM takes 32ms while this model takes 3.2ms-faster loading reduces downtime and ensures PLCs respond quickly to production line demands, improving overall operational efficiency.
What makes this PROM suitable for automotive under-hood applications?
The M95P32-IXCST/EF 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) to +105??C (under-hood heat from engines or batteries), surviving extreme temperature swings that damage commercial-grade PROMs. It also has 10K program cycles and 40-year data retention-ensuring reliable firmware storage for a vehicle??s 15+ year lifespan. Its small SON package fits in tight under-hood PCB layouts, avoiding space constraints.
How do the protection features prevent data corruption in IoT gateways?
It includes three layers of protection: sector-level write protection locks critical firmware (preventing accidental erasure), a hardware write protect pin disables all write operations when activated (even during electrical noise), and CRC error detection catches data transfer errors. Together, these features reduce data corruption errors by 92% in IoT gateways, preventing issues like failed firmware updates or lost security keys that disrupt network connectivity and require costly on-site repairs.