Forum: Reliability & Maintainability Questions and Answers
Posted by: TK Tan (email@example.com )
Date posted: Fri Jul 23 5:16:20 US/Eastern 1999
Subject: ESD Sensitivity
I find most IC data books state ESD testing using Mil-STD-883 Method 3015. HBM (2KV, 100pF, 1.5kohm, 10ns).
Although production has ESD protection in place, but I'm interested to know the ESD sensitivity of various type of components at low humidity (during winter time ?% RH). 1) CMOS 2) TTL 3) JFET 4) power supply regulator 5) power amplifier 6) diode, bi-polar transistor 7) capacitor, inductor, resistor If there are no data available, please advise me realistically whether ESD protection is a must for these components type, especially for analog PCBA with just regulator, amplifier, non-chip components (diode, transistor, capcitor, resistor). Thanks.
Posted by: Daniel Mahoney (firstname.lastname@example.org )
Date posted: Thu Jul 22 11:23:51 US/Eastern 1999
Subject: MEMS Reliability
I am interested in where the reliability community has gone in the area or Micro Electrical/Mechanical Systems (MEMS).
Have any reliability prediction models been developed (or are people just using the hybrid model)? Has there been enough testing to generate initial failure rate info? Any and all comments would be appreciated.
Posted by: Paul Smith
Date posted: Mon Jul 19 23:48:34 US/Eastern 1999
Subject: Electronics Dictionary
Can anyone recommend an easy-to-follow electronics dictionary with illustrations? I am starting to do some board reliability analysis but I do not have the background to know the differences between say a ceramic cap vs an electrolytic cap. The illustrations would be very helpful in trying to determine what the components is on the board.
Thank you for your help.
Posted by: Andy Stoebner (email@example.com )
Date posted: Mon Jul 19 13:54:39 US/Eastern 1999
Subject: Variability in the Response of a System
I am a graduate student working on a thesis that examines robustness vs. reliability. I am trying to find some other people's work on reducing the variation of the response of a system. In my case, I am trying to reduce the variation of the reliability index, beta. I will also be looking at optimizing the response while reducing the variability of the response. Please contact me if you know of any papers, books, websites, etc. that might be of any help.
Thank you, Andy Stoebner
Posted by:Marc Hughes (firstname.lastname@example.org )
Date posted: Wed Jul 14 14:52:22 US/Eastern 1999
Subject: Confidence Limits on Reliability Predictions
I have been asked about confidence limits on failure rates calculated using MIL-HDBK-217 & Bellcore, using the NPRD and vendor data. My experience in determining confidence limits is based on statistical type testing as described by MIL-STD-781 and not based on the reliability prediction. The requestor is continuing to state that you can determine confidence intervals on reliability calculations without test data. Do you know of a method, or a publication that would help? I thought at one time there was a paper written concerning confidence limits on the formulas presented in MIL-HDBK-217 since these formulae are based on test data of components?