demands for producing ipc class 3! lars-olof wallin ipc european representative seminar mitt...
TRANSCRIPT
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Demands for Producing IPC Class 3!
Lars-Olof WallinIPC European Representative
Seminar MITT University 2014-11-27
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IPC Part: 7Introduction to Produce
acc to IPC Class 3
How extensive is it towrite a specification?
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What expectations do you have of this
workshop?
The answer is?You hope to find some Gold!
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I can convert Lead into GOLD!!
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Which IPC Standards does is most known?
IPC-A-610E?
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Is it OK according to IPC-610E Class 3?
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IPC-A-610E
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It is not OK!!
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The board didn't work!
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Will this book solve the problems?
NO!!
Rev E
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Questions??• Please answer the following questions:
• Do you have demands for IPC Class 3 today?
• Have you some problems with the solder joint results and or your bare boards?
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Why do you have PROBLEMS?
The Answer is:
Lot of parameters during the entire production chain!
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Number of Combinations
4200 000 000 000 000 000 0
Too Many!!
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PWB
COMPONENTSSTENCIL
PASTE
Digital Data
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Let us take some examples!
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Offset resist window opening up trackand possibly touching BGA pad
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Inner layer
Solderfilled
via hole
Copperwall
Crack
Implications of CTE in the Z-direction
Greater tendency for cracks betwee inner layer and the wall for wider holes.
Greater tendency for barrel crack in thinner via holes (larger aspect ratio)
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What can GO WRONG?
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The Electronic Designer
I like complicated functions on a small surface!!
Is the Electronic Design the ROOT CAUSE?
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The CAD People
What is IPC-7351B?
My footprints hasn't changed
since 1903!
Is the CAD the ROOT CAUSE?
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Is PCB OK?
Is the Bare Board the ROOT CAUSE?
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What do you see here?
How many PTH do you have in your PCB?
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PWB
COMPONENTSSTENCIL
PASTE
Digital Data
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Loading
Loading
CAMScreen print
Jet printer
Is the Screen printing the ROOT CAUSE?
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Pick & Place
Pick & Place
Pick & Place
Pick & Place
Is the Pick & Place the ROOT CAUSE?
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Pick & Place
Repair of BGA
X-Ray
Vapor Phase
Reflow
AOI Unload
Unload
Is the Reflow or Wave Soldering the
ROOT CAUSE?
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Reflow
AOI Unload
Unload
Wave SolderingCleaning
Manual Assa
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It is many Process Steps!
The cause of a bad SolderJoint can be hard to find!
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It is NOT a piece of cake!
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What shall You Do Now?
No Control – Just Deliver?
Deliver and hope for the Best?
Start to Repair and Lose €€€?
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What can it COST?
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A typical Bare boardYou are assembling in
quantities of: 1000?
Costs:- Bare Board: 3€ each?- Components (BOM): 15€/board?- Assembling, Soldering & Testing: 4€/PCB? Total: 1000 x (3 + 15 + 4) = 22 000€
18%
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IPC-A-610E
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It is not OK!!
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SUMMARY
What shall You do?
COST
IPC Class 3
GO WRONG