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Printed Circuit Board Assembly & PCB Design Forum

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IPC Class II and Class III reliability

Denise

#24053

IPC Class II and Class III reliability | 8 April, 2003

I'm looking for comparison data on MTBF for solder joints meeting IPC Class II vs Class III.

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Jon Fox

#24055

IPC Class II and Class III reliability | 8 April, 2003

MTBF is hard to nail down raw data based on whether or not it is classified as IPC CII or CIII alone. Given that most failures are environmentally based, you might be able to get this data for CII and CIII in similar environmental testing situations, but this data will no doubtly change when you change the test. Can you be a little more specific in what or how the reliability of the boards are being tested.

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iman

#24064

IPC Class II and Class III reliability | 9 April, 2003

what r your test running parameters? what end-application?

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MA/NY DDave

#24071

IPC Class II and Class III reliability | 9 April, 2003

Hi

This is an excellent question or research project.

I would call the IPC and find out if anyone has already done this work.

My guess is that Class III should be slightly better, yet considering the application difference where Class III is used I don't know what the data will show.

YiEng, MA/NY DDave

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#24073

IPC Class II and Class III reliability | 9 April, 2003

MA/NY DDave, I'll take your money. I'm betting on the Class II, whatever that is, because:
* Solder is the same.
* Board is the same from a fabrication and probably materials standpoint.
* Components are the same.
* Processing is the same.

... but the end-use environment is more demanding for the Class III. I say, Class III curls-up and pleads for mercy under the unwithering pressure of 0 to 100, 15 minute dwell.

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MA/NY DDave

#24103

IPC Class II and Class III reliability | 10 April, 2003

Hi DaveyF,

Thanks

You see, you proved my point, with piles of more information than I gave.

Based on Application rather than design and manufacturing specifications, a lower IPC class can out perform another.

So our starting Poster must look at this very carefully when comparing MTBF rates.

YiEng, MA/NY DDave

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