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Note the word: "stress"
http://www.powerstream.com/SwPSFAQ.htm Mean time before failure. This is a statistical calculation, not a measurement. All the parts in a device have mean time between failure ratings. These are mathematically combined to get an MTBF number, often dependent on the stress put on them. Even the via holes in a circuit board have MTBF ratings. As you might think, as a rule of thumb, the more parts the less the MTBF. However, sometimes you can replace one part with a few more reliable parts, or spread the stress of one part over several parts and increase the MTBF. The human body has a trillion cells and each cell has an MTBF of 6 years. No wonder I don't feel so good. By the way, PowerStream engineers are well equipped to calculate MTBF using MIL-HDBK-217E. |
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