Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Michael Jeremias

#14962

Reliability of coated Plastic encapsulated Microcircuits | 20 July, 1998

Who knows something about the reliability of plasti PEMS and its enhancemant by application of conformal coating (Parylene, metal, SiO2, SiNxOx, etc.) ?

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P.L. Sorenson - Technical Consultant

#14964

Re: Reliability of coated Plastic encapsulated Microcircuits | 22 July, 1998

| Who knows something about the reliability of plasti PEMS and its enhancemant by application of conformal coating (Parylene, metal, SiO2, SiNxOx, etc.) ? My personal experience using PEM for military avionics applications has been very positive. Here are links to other sources of information relating to PEM reliability. http://www2.automata.com/ipc/TechNetd/9701/0220.html http://www.cera2.com/indcv/cots.htm http://rel.semi.harris.com/docs/rel/PEM/index.html http://www.calce.umd.edu/general/projects/summary/1997/c97-04.htm Regarding coating of PEM, I don't expect coating to effect reliability of the PEM to a great extent, but a good coating can improve overall circuit functionality in high humidity. Regards, Pete Sorenson

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David Pinsky

#14965

Re: Reliability of coated Plastic encapsulated Microcircuits | 22 July, 1998

| | Who knows something about the reliability of plasti PEMS and its enhancemant by application of conformal coating (Parylene, metal, SiO2, SiNxOx, etc.) ? | My personal experience using PEM for military avionics | applications has been very positive. Here are links | to other sources of information relating to PEM reliability. | http://www2.automata.com/ipc/TechNetd/9701/0220.html | http://www.cera2.com/indcv/cots.htm | http://rel.semi.harris.com/docs/rel/PEM/index.html | http://www.calce.umd.edu/general/projects/summary/1997/c97-04.htm | Regarding coating of PEM, I don't expect coating | to effect reliability of the PEM to a great extent, | but a good coating can improve overall circuit functionality | in high humidity. | Regards, | Pete Sorenson

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David A. Pinsky

#14963

Re: Reliability of coated Plastic encapsulated Microcircuits | 22 July, 1998

| Who knows something about the reliability of plasti PEMS and its enhancemant by application of conformal coating (Parylene, metal, SiO2, SiNxOx, etc.) ? We have performed failure analyses on PEM's in our lab for many years. The vast majority of package-related PEM failures result from internal delaminations or from intermetallic growth between bond pads and wire bonds. Conformal coating will not significantly affect these failure modes. We are currently running an extended study on PEM reliability, which includes CC as a variable, but anticipate that it will not be an important player. CC does enhance the reliability of the assembly, as it always has.

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