adequately with technical uncertainties
& Quality Management
calculation with Siemens SN 29500
| MTBF-Calculation acc. to Standards
SN 29500 has
been developed and is maintained and updated by Siemens company, with
the latest issue 2011.
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 these
12 documents are so tiny that their total extent 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 2015, issue dates of SN 29500 documents
vary from 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 keeping the required model parameters even simple to
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 and a limited set of different categories.
Furthermore, it offers only one environment type, which is not even
described at all. Practical experience suggests that the SN 29500
environment type is
probably avarage industrial environment.
Since it is a
german standard, SN
29500 is always a good choice in germany with the exception of military
and aviation industry. Furthermore, SN 29500 has even some global
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