Siemens 6ES7953-8LP20-0AA0 – S7 Micro Memory Card 8MB
Siemens 6ES7953-8LP20-0AA0 – S7 Micro Memory Card 8MB from the S7-300 range. Status: discontinued by the manufacturer, no longer available new since October 2023; successor 6ES7953-8LP31-0AA0. Van Haelen supplies it new in sealed factory packaging, with a 24-month warranty.
Also written as: 6ES7 953-8LP20-0AA0, 6ES79538LP200AA0
The Siemens 6ES7953-8LP20-0AA0 is a S7-300 control component from the Simatic S7 (S7-300) range. Manufacturer type designation: S7 Micro Memory Card 8MB. Status: discontinued by the manufacturer, no longer available new since October 2023; successor according to the manufacturer: 6ES7953-8LP31-0AA0. Key data: weight 0.031 kg, dimensions 10,6 x 9,3 x 0,5 cm, HS code 85235110. When replacing, check the product version (issue) on the rating plate; for most installations the same or a higher issue is suitable. Ask us about exchange, repair and a spare-parts pool for your installation.
Available as
Product data
| Manufacturer | Siemens |
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| Part number | 6ES7953-8LP20-0AA0 |
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| Type designation | S7 Micro Memory Card 8MB |
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| Series | S7-300 |
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| Manufacturer status | discontinued by the manufacturer, no longer available new since October 2023 |
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| Successor | 6ES7953-8LP31-0AA0 |
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| ETIM | EC002584 |
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| HS code | 85235110 |
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| Weight | 0,031 kg |
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| Dimensions | 10,6 x 9,3 x 0,5 cm |
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Documentation from the manufacturer
All products of the S7-300 series
Faults and fixes 6ES7953-8LP20-0AA0
Problems with 6ES7953-8LP20-0AA0: red SF LED on the module
An SF LED on a signal module means a channel or module diagnostic: missing load voltage (L+ 24 V not connected or a fuse), wire break on inputs with wire-break monitoring, a short circuit on an output, or wrong parameterisation. The CPU's diagnostic buffer names channel and cause. A module that keeps reporting SF after the cause is removed is usually defective itself.
6ES7953-8LP20-0AA0: one channel has stopped working or an output sticks
One dead channel with the rest working normally points to a damaged input or output stage, often from overvoltage, a short circuit or an inductive load without a flyback diode. Swap the wiring to a free channel to separate the module from the installation. If the channel is defective, replace the module; repairing single channels is rarely worthwhile.
What do I check when replacing a 6ES7953-8LP20-0AA0?
The same order number with the same or a higher product version (issue) fits without changing the configuration. Carry over the front connector with its wiring, put the module in the same slot and check the diagnostic buffer after power-up. On modules with parameterisation (analogue: measuring range, range selectors on the side) set the range modules to the same position.
Fault not fixed: replace, exchange or repair the 6ES7953-8LP20-0AA0?
Replacing from stock is the fastest route when a machine is down. Van Haelen supplies the 6ES7953-8LP20-0AA0 new in factory packaging, with a 24-month warranty. The current lead time is shown with the condition on this page. Prefer an exchange: you get a refurbished unit straight away and return the faulty one within 14 days. Repairing your own unit is also possible: diagnosis, then a fixed price.
What information should I send for a quick diagnosis?
A photo of the rating plate (order number, product version, firmware), the exact fault code or LED state, when the fault occurs (at power-up, on enable, under load) and what you have already tried. For PLCs an export of the diagnostic buffer, for drives the parameter set. With that we can usually say the same day whether replacing, exchanging or repairing is best.
Frequently asked questions
Is the 6ES7953-8LP20-0AA0 still available?
Not new from the manufacturer any more: the 6ES7953-8LP20-0AA0 was discontinued since October 2023. Van Haelen supplies it from stock.
What is the successor of the 6ES7953-8LP20-0AA0?
According to the manufacturer it is the 6ES7953-8LP31-0AA0. A successor does not always fit an existing installation without changes; replacing like for like is often the fastest route. If in doubt, ask us.
What should I check when replacing a 6ES7953-8LP20-0AA0?
Check the product version (issue) on the rating plate; for most installations the same or a higher issue is suitable.