vlsi:basic:fail

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vlsi:basic:fail [2016/11/10 05:37] (当前版本) |
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+ | ====== FITS Failures in Time ====== | ||

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+ | Failure In Time (FIT) method of specifying component reliability. | ||

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+ | The FIT rate is defined as the expected number of component failures per 10^9 (ten to the ninth power, or 1,000,000,000) hours. | ||

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+ | The FIT rate can be converted immediately to the MTBF (Mean Time Between Failures) in hours as MTBF = 10^9/FIT. | ||

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+ | The Annualized Failure Rate (AFR) can be calculated as AFR = (FIT * 8760)/109. | ||

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+ | The advantage of using FIT rates rather than the MTBF metric is that FIT rates are additive. | ||

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+ | For example, the FIT rate of a current-production M3F-PCIXD-2 interface is 200, the sum of the FIT rate of the fiber transceiver, 125, and the FIT rate of all other component failures, 75. | ||

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+ | A FIT rate of 200 corresponds to an MTBF of 109/200 = 5M hours, and to an AFR of (200 * 8760)/109 = 0.00175 = 0.175%. |

vlsi/basic/fail.txt · 最后更改: 2016/11/10 05:37 (外部编辑)

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