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Siemens 6ES7953-8LM31-0AA0 — PLC Accessories

Siemens 6ES7953-8LM31-0AA0 S7-300 MMC, 4 MB Flash-EPROM

MPN6ES7953-8LM31-0AA0

Siemens SIMATIC S7 micro memory card, 4 Mbyte Flash-EPROM, for S7-300/C7/ET 200, 1.4 x 24 x 32 mm, approx. 2 g.

$228.60 – $488.00Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

6ES7953-8LM31-0AA0 — Specifications
ParameterValue
Depth1.4 mm
Width24 mm
Height32 mm
Memory size4 Mbyte
Type of memoryFlash-EPROM
Weight, approx.2 g
Belongs to productS7-300 / ET 200
Number of write (delete operations, min.)100 000
Data retention (after final programming action), min.10 y

Product details

Memory card for S7-300 and ET 200

The Siemens 6ES7953-8LM31-0AA0 is a 4 Mbyte Flash-EPROM micro memory card (MMC) belonging to the S7-300 and ET 200 product family — it's the program and data storage for those PLC systems, not a general-purpose SD card. Rated for a minimum of 100 000 write/delete operations and 10 years of data retention after final programming, so it handles routine program updates and long-term recipe storage without wearing out prematurely on a production line.

The card is keyed to the slot orientation; it only inserts one way, so there's no risk of reversing polarity in a panel rebuild.

Frequently asked questions

What is the memory size of 6ES7953-8LM31-0AA0?

4 Mbyte of Flash-EPROM memory. That's enough for mid-size S7-300 programs including the logic blocks, data blocks, and system configuration.

MPN
6ES7953-8LM31-0AA0