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| Place of Origin: | Germany |
| Brand Name: | Siemens |
| Certification: | COO & COC |
| Model Number: | 6ES7953-8LL31-0AA0 |
6ES7953-8LL31-0AA0 Siemens SIMATIC S7-300 Micro Memory Card 2 MB Flash-EPROM
The Siemens 6ES7953-8LL31-0AA0 is an industrial-grade micro memory card designed for SIMATIC S7-300, C7, and ET 200 series automation control systems. This memory card utilizes 3.3V Nflash/Flash-EPROM technology, providing a reliable 2MB storage capacity for storing user programs, system data, configuration parameters, and backup files. It is an indispensable data storage component in the field of industrial automation.
Key Product Specifications
| Part Number | 6ES7953-8LL31-0AA0 |
| Product Type | SIMATIC Micro Memory Card (MMC) |
| Memory Capacity | 2 MB |
| Compatibility | SIMATIC S7-300 CPU series (e.g., CPU 312, 314, 315, 317, 319) |
| Interface | Built-in MMC slot on S7-300 CPUs |
| Data Retention | >10 years (without power) |
| Write Cycles | Rated for up to 100,000 write/erase cycles |
| Certifications | CE, UL, cUL, RoHS compliant |
Product details pictures
Why Use the Genuine Siemens 6ES7953-8LL31-0AA0?
Unlike commercial SD or MMC cards, this industrial-optimized memory card is rigorously tested by Siemens for:
Long-term reliability in harsh factory environments (vibration, temperature fluctuations, EMI)
Full compatibility with S7-300 firmware and STEP 7 engineering tools
Secure data integrity and protection against corruption
Using non-approved memory cards may cause system instability, data loss, or void warranty coverage.
Important Notes
The 6ES7953-8LL31-0AA0 does not include a built-in battery—data retention is purely flash-based.
Always back up your project in STEP 7 before removing or replacing the MMC.
Formatting must be done via the PLC or STEP 7 software—do not format using a standard PC card reader.
Availability & Lifecycle Status
As of 2025, the 6ES7953-8LL31-0AA0 remains available through Siemens and authorized distributors, though it is part of the mature S7-300 product family. Siemens recommends planning migration to SIMATIC S7-1500 for new designs, but continues full support for existing S7-300 systems.
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