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MTBF calculation with Siemens SN 29500

  MTBF-Calculation acc. to Standards
       Mil-HDBK-217
       Telcordia SR-332
       IEC-TR-62380
       Siemens SN 29500
       FIDES 2009
       217Plus
       GJB/Z 299C
SN 29500 has been developed and is maintained and updated by Siemens company, with the latest issue 2011. 
In simple words, SN 29500 is a ready-for-use version of IEC 61709 (also published by Siemens company). 
It is a disadvantage that SN 29500 consists of 12
  individual documents which have to be bought separately at a very high total cost of about 600 €, but the content of these 12 documents together is comparable with other electronic reliability prediction standards, which usually cost not more than 150 €.

All 12 documents have individual revisions, which makes it difficult to name a formal SN 29500 revision. As of 2021,  the latest issues vary between 2004 to 2011. 
For electromechanical components like switches, relays, contactors and connectors, Siemens SN 29500 offers the most sophisticated and therefore the best calculation models among all electronic reliability standards, while still keeping the required model parameters simple to assess. 
With respect to ICs, SN 29500 is the only standard to distinguish between application types, for example operational amplifier, voltage supply, regulator, switched regulator, etc. 

In general however, SN 29500 is rather a simple standard with limited component type coverage. Furthermore, it offers only a single environment type, which is not even mentioned at all. Practical experience suggests that the SN 29500 environment type is probably avarage industrial environment.


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