Siemens 6ES7953-8LG30-0AA0 Micro Memory Card for S7-300

The Siemens 6ES7953-8LG30-0AA0 is a 128 KB SIMATIC S7 micro memory card designed for S7-300, C7, and ET 200 controllers. Running on 3.3 V NFLash, this compact card provides non-volatile storage for firmware and configuration data, enabling reliable retention of program blocks and settings even when power is removed. Measuring 24 x 32 x 1.4 mm and weighing about 2 g, the card is classified as a spare part for S7-300 family devices, and is used to replace or upgrade memory in CPUs and field modules that rely on MMC storage. Data retention is guaranteed for at least 10 years after the last programming action, ensuring long-term preservation of critical data in industrial environments. The 6ES7953-8LG30-0AA0 is compatible with a range of S7-300 series hardware, including C7 and ET 200 modules, and it is commonly employed during firmware updates or system maintenance where a dedicated MMC is required.