SIEMENS 6ES7953-8LJ00-0AA0 Micro Memory Card 64KB | Replacement, Equivalent & Selection Guide
The SIEMENS 6ES7953-8LJ00-0AA0 is a 64KB Micro Memory Card (MMC) designed for the SIMATIC S7-300 programmable logic controller family. It serves as non-volatile program and data storage, retaining content without a backup battery. This page provides full technical specifications, compatible replacement models, application scenarios, and a structured selection guide to help engineers and procurement teams make the right choice.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6ES7953-8LJ00-0AA0 |
| Brand | SIEMENS / SIMATIC |
| Series | SIMATIC S7-300 |
| Card Type | Micro Memory Card (MMC) |
| Storage Capacity | 64 KB |
| Interface | MMC slot (S7-300 CPU front panel) |
| Data Retention | 10 years (without battery) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -20 °C to +70 °C |
| Dimensions (W×H×D) | Approx. 11 × 15 × 1 mm (standard MMC form factor) |
| Weight | Approx. 2 g |
| Country of Origin | Germany |
| SIEMENS Order No. | 6ES7953-8LJ00-0AA0 |
Compatible Replacement & Equivalent Models
The table below lists direct replacements and functional equivalents for the 6ES7953-8LJ00-0AA0. Always verify firmware compatibility before substitution.
| Part Number | Brand | Capacity | Compatibility | Notes |
|---|---|---|---|---|
| 6ES7953-8LJ00-0AA0 | SIEMENS | 64 KB | S7-300 (all CPUs) | Original — recommended |
| 6ES7953-8LF20-0AA0 | SIEMENS | 64 KB | S7-300 | Older revision; functionally equivalent |
| 6ES7953-8LG11-0AA0 | SIEMENS | 64 KB | S7-300 | Intermediate revision |
| 6ES7953-8LL31-0AA0 | SIEMENS | 4 MB | S7-300 | Upgrade option for larger programs |
| 6ES7953-8LM31-0AA0 | SIEMENS | 8 MB | S7-300 | Maximum capacity MMC for S7-300 |
Note: Third-party MMC cards are not officially supported by SIEMENS and may cause CPU faults. Always use genuine SIEMENS MMC cards for production environments.
Why Choose the Original Model
- Guaranteed compatibility — factory-tested with all S7-300 CPU variants (CPU 312 through CPU 319).
- Battery-free retention — program and data blocks are retained for up to 10 years without a backup battery.
- Firmware-safe — supports CPU firmware updates stored directly on the MMC.
- Certified quality — manufactured to IEC 61131-2 and SIEMENS internal quality standards.
- Plug-and-play replacement — no additional configuration required when swapping CPUs in the field.
Typical Applications
- Program storage for SIMATIC S7-300 CPUs in manufacturing automation lines.
- Data logging and recipe storage in food & beverage processing plants.
- CPU firmware upgrade carrier during field maintenance.
- Spare-part inventory for MRO (Maintenance, Repair & Operations) departments.
- Machine tool controllers, conveyor systems, and packaging machinery.
- Water treatment and utilities SCADA-linked PLC nodes.
System Compatibility
The 6ES7953-8LJ00-0AA0 is compatible with the following SIMATIC S7-300 CPU modules:
- CPU 312, CPU 313C, CPU 314, CPU 314C-2 DP/PN
- CPU 315-2 DP, CPU 315-2 PN/DP
- CPU 317-2 DP, CPU 317-2 PN/DP
- CPU 319-3 PN/DP
- CPU 312C, CPU 313C-2 DP, CPU 314C-2 PtP
Not compatible with S7-200, S7-400, S7-1200, or S7-1500 series.
Selection Guide
Use the following criteria to select the correct MMC for your S7-300 application:
| Requirement | Recommended Part |
|---|---|
| Standard program (<64 KB), cost-sensitive | 6ES7953-8LJ00-0AA0 (this item) |
| Medium program (64 KB – 512 KB) | 6ES7953-8LK31-0AA0 (512 KB) |
| Large program or data logging (>512 KB) | 6ES7953-8LL31-0AA0 (4 MB) |
| Maximum capacity / firmware archive | 6ES7953-8LM31-0AA0 (8 MB) |
| Replacement for failed MMC (same CPU) | Match original part number exactly |
| CPU swap / hot-standby redundancy | Use identical MMC part numbers on both CPUs |
Quality Assurance & Sourcing
- Genuine SIEMENS parts — sourced directly from authorized distributors and SIEMENS-certified supply chains.
- Each unit undergoes incoming inspection: visual check, label verification, and functional read/write test.
- Anti-static packaging with humidity indicator card for safe long-distance shipping.
- Traceability: batch records and certificates of conformity available on request.
- Konmask.com maintains stock of both current and legacy MMC revisions to support installed-base maintenance.
How to Order
- Online: Add to cart directly on this page. Secure checkout with DHL / FedEx international shipping.
- Email RFQ: support@konmask.com — include part number, quantity, and required delivery date.
- Phone / WhatsApp: +0086 19859288691
- Bulk orders (>10 pcs) qualify for volume pricing — contact us for a formal quotation.
- Lead time: in-stock items ship within 1–2 business days; ex-stock orders within 5–7 business days.
Replacement & Compatibility FAQ
Q: Can I use a higher-capacity MMC (e.g., 4 MB) in place of the 64 KB card?
A: Yes. Higher-capacity MMCs are backward compatible with all S7-300 CPUs. The CPU will use only the space it needs.
Q: Will the program be lost if I remove the MMC while the CPU is powered?
A: Yes — always power down the CPU or set it to STOP mode before removing or inserting the MMC.
Q: Is the 6ES7953-8LJ00-0AA0 compatible with S7-1200 or S7-1500?
A: No. S7-1200 and S7-1500 use a different SIMATIC Memory Card (SMC) format. See our SIMATIC Memory Card collection for those models.
Q: How do I verify the MMC is genuine SIEMENS?
A: Check the holographic label, SIEMENS logo embossing, and order number printed on the card. Konmask.com provides a certificate of authenticity upon request.
Q: What happens when the MMC reaches end of life?
A: Data retention degrades after ~10 years. Replace proactively during scheduled maintenance to avoid unplanned downtime.
© 2026 Konmask.com. All rights reserved.
Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
