The MTBF is directly related to the design, tolerances and quality of the individual components. The reliability is dependent on a combination of factors, which includes the components, design and analysis, manufacturing process, testing, burn-in and applications. It is therefore not applicable to the period where the equipment suffers from ‘early failures’ or ‘wear out’ failures as shown in the bathtub.įigure 1: Bathtub curve showing of failure rates of a product – Image Credit Factors that affect the MTBF value and reliability The MTBF applies to a combination of components and processes and more specifically during the products normal operating phase with a constant failure rate. The values affect the performance and reliability of the power supply or equipment. This means that a low MTBF shows that the power supply will fail several times as compared to one with a higher value. The MTBF is not the time it takes for a power supply to fail, it is the total functional life of the supply divided by the number of failures. These are mathematically combined to get an MTBF figure, often dependent on the stress put on them. All the parts in a power supply have mean time between failure ratings. The Mean Time Between Failures (MTBF) is a measurement of the relative reliability of a power supply based upon a statistical calculation, not a measurement. What is MTBF? – Mean Time Between Failures
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