vlsi:basic:fail

# 差别

 — vlsi:basic:fail [2016/11/10 05:37] (当前版本) 行 1: 行 1: + ====== FITS  Failures in Time ====== + + + Failure In Time (FIT) method of specifying component reliability. ​ + + 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. ​ + + The FIT rate can be converted immediately to the MTBF (Mean Time Between Failures) in hours as MTBF = 10^9/​FIT. ​ + + The Annualized Failure Rate (AFR) can be calculated as AFR = (FIT * 8760)/109. + + The advantage of using FIT rates rather than the MTBF metric is that FIT rates are additive. ​ + + 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. + + 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)