EOL replacement finder

SIMATIC S7-300 Micro Memory Card (MMC)

Your automation part went EOL — here is every way out, with the compatibility catch on each one.

Manufacturer: Siemens
Category: PLC memory card

Lifecycle status

Siemens notice 109809890 announced the S7-300 / ET 200M phase-out (PM400) on 1 October 2023 and discontinued the platform (PM410) on 1 October 2025; production has stopped and parts are supplied as spares or repair/exchange only, in spare-part quantities. Final discontinuation (PM490) is not planned before 1 October 2033, ten years after PM400, though Siemens does not guarantee that date for every assembly. The notice covers S7-300 accessories as a category but its per-part list is a login-gated spreadsheet, so no phase-out date is confirmed here for the 6ES7953 cards themselves. The memory cards are the part that fails and strands otherwise-working controllers.

Replacement paths, side by side

The decisive attribute in this vertical is software and runtime compatibility, not electrical specs. Read the compatibility column before the price column.

Route	What	Price band	Availability	Compatibility — the dealbreakers
Compatible third party	VIPA memory card VIPA (YASKAWA)	No EU list price published by Yaskawa/VIPA or its German distributors; quoted on request.	Not established in research	Drop-in for the S7-300 card slot. No project change. Why this matters ⌄
discussed on r/PLC →
Compatible third party	Helmholz memory card Helmholz	Helmholz publishes no list prices; its S7 components catalogue directs buyers to request a quote.	Distributor and direct	Drop-in for the S7-300 card slot. No project change. Why this matters ⌄
Caveat: Community reports that nominal capacity is not usable capacity - a 2 MB card gives roughly 1.5 MB of usable project space. Size up if your project is near the limit. discussed on r/PLC →
Stay put	Original Siemens MMC Siemens	€414–567 across 3 EU distributors RS, 2026-09-04	In stock at RS (15 pcs)	Guaranteed - this is the same part. The do-nothing option and the price benchmark the alternatives are measured against. Why this matters ⌄
Caveat: The r/PLC thread that made this part notorious quotes roughly $2,000 for the OEM card. Today's EU distributor listings are far below that — check the current price before assuming the card is the expensive problem it was. discussed on r/PLC →

Where the research did not establish a figure, this page says so rather than estimating one. A number you cannot defend is worse than no number.

What the community actually said

These pages are built from forum threads, not brochures. The tacit gotchas — the ones that are not on any datasheet — live in these discussions.

Is there any alternative for this? · r/PLC

Links open a search on the forum the discussion took place on. German thread titles are given here in English translation.

Manufacturer sources

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