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參數(shù)資料
| 型號(hào)： | IRG4PF40MD |
| 廠商： | International Rectifier |
| 英文描述： | Fit Rate / Equivalent Device Hours |
| 中文描述： | FIT率/等效器件小時(shí) |
| 文件頁數(shù)： | 5/35頁 |
| 文件大?。?/td> | 112K |
| 代理商： | IRG4PF40MD |
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Fit Rate / Equivalent Device Hours
λ
= Proportion allowed system failures
Time period
X
1
X
10
9
=
FITS
No. of devices
In the case of the example,
λ
=
0.01 Failures
720 Hours
X
1
=
10
9
=
14 FITS
1000 Devices
or 14 FITs or 14 failures per 10
9
devices hours.
Traditionally, reliability results have been presented in terms of Mean-Time-To-Failure
or Median-Time-To-Failure.
While these results have their value, they do not
necessarily tell the designer what he most needs to know. For example, the Median-
Time-To-Failure tells the engineer how long it will take for half a particular lot of
devices to fail. Clearly no designer wishes to have a 50% failure rate within a
reasonable equipment lifetime. Of greater interest, therefore, is the time to failure of a
much smaller percentage of devices say 1% or 0.1%. For example, in a given
application one failure per hundred units over five years is an acceptable failure rate
for the equipment, the designer knows that time to accumulate 1% failure of that
components per unit, then no more than 0.1% of the components may fail in five
years. Therefore, the IGBT / CoPack reliability or operating-life data is presented in
terms of the time it will take to produce a prescribed number of failures under given
operating conditions.
To obtain a perspective of failure rate from an example, let us assume that an
electronic system contains 1,000 semiconductor devices, and that it can tolerate 1%
system failures per month. The equation for the device failure is:
IGBT / CoPack
Quarterly Reliability Report
Page 5 of 35
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| IRG4PF40UD | 制造商:IRF 制造商全稱:International Rectifier 功能描述:Fit Rate / Equivalent Device Hours |
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