The Siemens 6ES7953-8LF20-0AA0 is a SIMATIC S7 Micro Memory Card (MMC) with 64 KB of storage capacity, designed for use with S7-300, C7, and ET 200 series controllers. It uses 3.3V N-Flash technology to store program blocks, data blocks, and system configuration data.
The card serves as the load memory for the CPU, retaining the user program and configuration even when power is removed. It is inserted directly into the CPU’s memory card slot and is required for operation on many S7-300 CPU models.
Item No :
6ES7953-8LF20-0AA0Order(MOQ) :
1Payment :
EXWProduct Origin :
GermanyShipping Port :
Wuhan, Hubei, ChinaLead Time :
3-5 daysWeight :
0.030kgOverview
6ES7953-8LF20-0AA0 SIMATIC PLC Module
New in stock
Origin from Germany
Payment Method: TT.Western Union
Shipping Method: DHL\UPS\Fedex\EMS\Others
More Brands
| Part Number | Description | Key Difference |
|---|---|---|
| 6ES7953-8LF20-0AA0 | MMC, 64 KB (this item) | Discontinued; remaining stock |
| 6ES7953-8LF31-0AA0 | Successor – MMC, 64 KB | Smaller form factor (0.017 kg) |
| 6ES7953-8LG20-0AA0 | MMC, 128 KB | Higher capacity |
| 6ES7953-8LJ20-0AA0 | MMC, 512 KB | Higher capacity |
| 6ES7953-8LL20-0AA0 | MMC, 2 MB | Higher capacity for larger programs |
Important Compatibility Note: MMC cards are not interchangeable with the newer SIMATIC Memory Cards used in S7-1200/1500 systems. This card is designed exclusively for the S7-300/C7/ET 200 generation.
1 × Siemens 6ES7953-8LF20-0AA0 SIMATIC S7 Micro Memory Card (64 KB)
Note: CPU and programming software are sold separately.
In Stock – Ready to ship immediately
Tested – Each unit verified for functionality
Warranty Included – 12-month warranty for purchase confidence
Technical Support – S7-300 compatibility assistance available
Q1: What is the Siemens 6ES7953-8LF20-0AA0?
It is a SIMATIC S7 Micro Memory Card (MMC) with 64 KB capacity, using 3.3V N-Flash technology. It is designed for S7-300, C7, and ET 200 controllers to store program and configuration data.
Q2: Is this product still available from Siemens?
No. It was discontinued effective October 1, 2021 (PM500 status). It is available only through remaining stock, refurbished units, or third-party suppliers.
Q3: What is the successor model?
The designated successor is 6ES7953-8LF31-0AA0, which has the same 64 KB capacity and compatibility but a smaller physical form factor (0.017 kg vs. 0.030 kg).
Q4: Which systems is this memory card compatible with?
It is compatible with SIMATIC S7-300, C7, and ET 200 series controllers. It is not compatible with S7-1200 or S7-1500 systems, which use different memory card formats.
Q5: What is the memory technology used?
It uses 3.3V N-Flash technology, which is non-volatile and retains data without a backup battery.
Q6: What is the write/erase endurance of this card?
The minimum rated endurance is 100,000 write/erase cycles.
Q7: Can I format this card in a standard PC card reader?
No. S7-300 MMC cards must only be formatted through the PLC itself (using Step 7 and the CPU’s formatting function). Formatting in a standard PC reader destroys the Siemens-proprietary header and bootloader, rendering the card permanently unusable for S7-300 applications.
Q8: What are the dimensions and weight?
Net weight is 0.030 kg. Packaging dimensions are 9.30 × 10.60 × 0.50 cm.
Q9: What is the country of origin?
Germany.
Q10: What should I verify before ordering?
Always verify the exact part number (6ES7953-8LF20-0AA0), confirm your CPU model is an S7-300/C7/ET 200 series (not S7-1200/1500), and check whether you should order the successor 6ES7953-8LF31-0AA0 for improved availability. Ensure the 64 KB capacity is sufficient for your program size.
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