The Siemens 6ES7953-8LG20-0AA0 is a spare-part Micro Memory Card (MMC) for the SIMATIC S7-300, C7, and ET 200 families. It provides 128 KB of 3.3V Nflash storage for program and data retention. This is not a current-generation memory card for new designs — it is listed as a mature spare part, meaning it remains available through the service parts channel for installed S7-300 and ET 200 systems that still use the MMC slot.
Siemens 6ES7953-8LG20-0AA0 S7 Micro Memory Card, 128 KB
MPN6ES7953-8LG20-0AA0
Siemens S7 Micro Memory Card, 6ES7953-8LG20-0AA0, 128 KB 3.3V Nflash, spare part for S7-300/C7/ET 200.
$59.69Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Weight | 0.00 kgs |
Product details
Frequently asked questions
What replaces the 6ES7953-8LG20-0AA0 for new designs?
For new S7-1200/1500 controllers, the SIMATIC memory card uses a different form factor (e.g., 6ES7954-8LC03-0AA0). For existing S7-300 CPUs, a higher-capacity MMC from the same 6ES7953-8Lxxx series may be used if the CPU firmware supports it — verify the CPU's maximum MMC size in its manual.
Will the 6ES7953-8LG20-0AA0 work in any S7-300 CPU?
It fits any S7-300, C7, or ET 200 CPU with an MMC slot. The 128 KB capacity is sufficient for small to medium programs; larger programs require a higher-capacity MMC. Check the CPU's technical data for the maximum supported MMC size.
MPN
6ES7953-8LG20-0AA0