Overview

The Micro Memory Card (MMC) 6ES7 953-8LP31-0AA0 is a compact, robust memory component tailored for reliable data storage and program retention across Siemens automation platforms, including SIMATIC S7-300, C7, and ET 200 systems. Engineered using 3 V non-volatile flash technology (NFLASH), it securely retains key application data—even through power cycles or outages.RS ComponentsSiemens Industry Mobile Support

Technical Specifications

• Memory Type & Capacity
  Uses Flash-EPROM (NFLASH) technology with a storage size of 8 MbyteRS ComponentsOctopart.

• Write Endurance & Data Retention
  Rated for a minimum of 100,000 write/delete cycles. Maintains data integrity for at least 10 years post final programmingRS Components.

• Physical Form Factor
  Ultra-thin and lightweight card measuring 24 mm × 32 mm × 1.4 mm, weighing approximately 2 gRS ComponentsOctopart.

• Compatibility
  Designed to pair with SIMATIC S7-300 CPUs, C7 series, and ET 200 distributed I/O modules, making it a versatile addition across multiple Siemens automation architecturesRS ComponentsSiemens Industry Mobile Support.

• Lifecycle Status
  Released in October 2013, this card is now approaching the end of its lifecycle, with Siemens having issued a phase-out notice. Replacement planning is recommendedSiemens Industry Mobile Support.

Engineering Highlights

• Reliable Storage for Critical Tasks
  Offers dependable program and firmware storage for PLC controllers, withstanding frequent updates and ensuring data persistence.

• Compact & Low-Profile Design
  Fits within constrained control cabinets or tight slot configurations without impacting module spacing.

• High Durability
  Endurance for up to 100,000 reprogramming cycles, with decade-level data retention—ideal for frequent deployments or long-service applications.

• Seamless Integration
  Built for instant slot-based compatibility with Siemens S7-300, C7, and ET 200 platforms, simplifying maintenance and field replacement.

• Lifecycle Awareness
  Given its phase-out status since 2013, it’s prudent to evaluate modernization or make-ahead provisioning for successor memory solutions.

Technical Summary Table

Applications

• Storage of PLC firmware, program blocks, and operational scripts in automation systems.

• Affordable replacement for worn-out or corrupted memory cards in S7-300 or ET 200 installations.

• Backup device for emergency program restoration or field commissioning.

• Ideal for environments requiring frequent device reprogramming or reconfiguration.

Conclusion

The SIMATIC Micro Memory Card (6ES7 953-8LP31-0AA0) serves as a dependable and compact solution for analog programmable memory across Siemens hardware platforms. It delivers stable, long-term operation with strong endurance and compatibility. However, due to its phase-out status, planning for replacements or migration to newer memory formats is highly recommended.