PCB reliability
PCB reliability
(OP)
Hi,
I am struggling with life prevision of bare Printed Circuit Board (PCB).
The approach is to submit a bunch of PCBs to climate chamber accelerated life 885°C/85%) for a certain amount of time.
The problem then is the correlation between such accelerated life time to teh standard/specs operating life time.
How much does 1hr in the chamber (accelerated life) correspond to operating (T°C) life time ?
Can anyone provide simple method, material (white paper, presentation, ..) to correlate the two ?
Thank you in advance for any help....
Stefano
I am struggling with life prevision of bare Printed Circuit Board (PCB).
The approach is to submit a bunch of PCBs to climate chamber accelerated life 885°C/85%) for a certain amount of time.
The problem then is the correlation between such accelerated life time to teh standard/specs operating life time.
How much does 1hr in the chamber (accelerated life) correspond to operating (T°C) life time ?
Can anyone provide simple method, material (white paper, presentation, ..) to correlate the two ?
Thank you in advance for any help....
Stefano





RE: PCB reliability
RE: PCB reliability
Normal Google has plenty of explanations on various Wikis.
Good luck.
RE: PCB reliability
https://en.wikipedia.org/wiki/Highly_accelerated_s...
http://www.tdipower.com/PDF/white_paper/hass.pdf
http://arxiv.org/pdf/0708.0369.pdf
TTFN
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RE: PCB reliability
RE: PCB reliability
Darrell Hambley P.E.
SENTEK Engineering, LLC
RE: PCB reliability
Dan - Owner
http://www.Hi-TecDesigns.com
RE: PCB reliability
TTFN
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Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx
RE: PCB reliability
Actually, I was not looking for theoretical, school or Wikipedia's material but rather something more operating and real experience-based.
I got plenty of materials from Internet but I was asking real field experience and help.
We experienced failure in prototype flex pin-to-pin PCB due to (we assume) bath infiltration under the cover lay and we need to perform in-house accelerated test to understand risk on parts in the field.
Do anyone know a quick-to-apply relation or procedure to evaluate something like "1hr test @ certain T/RH conditions = X hrs at operating conditions ?"
I understand it is something like a magic recipe but it is what I need .....
Thank you to All for help.
RE: PCB reliability
The difficulty is in getting meaningful activation energies or equivalent.
TTFN
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Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx
RE: PCB reliability
I have also found a relation showing the acceleration due to RH and it could be another acceleration factor in my tests.
A=t_test/t_opearting=(RH_test/RH_opeating)^3* <Arrhenius equation>
Where:
RH_test= RH during test
RH_perating= max RH in operating conditiosn
t_test= test time
t_operating=life under operating conditions