Demands for Producing IPC Class 3! Lars-Olof Wallin IPC European Representative Seminar MITT...
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Transcript of Demands for Producing IPC Class 3! Lars-Olof Wallin IPC European Representative Seminar MITT...
Demands for Producing IPC Class 3!
Lars-Olof WallinIPC European Representative
Seminar MITT University 2014-11-27
IPC Part: 7Introduction to Produce
acc to IPC Class 3
How extensive is it towrite a specification?
What expectations do you have of this
workshop?
The answer is?You hope to find some Gold!
I can convert Lead into GOLD!!
Which IPC Standards does is most known?
IPC-A-610E?
Is it OK according to IPC-610E Class 3?
IPC-A-610E
It is not OK!!
The board didn't work!
Will this book solve the problems?
NO!!
Rev E
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?
Why do you have PROBLEMS?
The Answer is:
Lot of parameters during the entire production chain!
Number of Combinations
4200 000 000 000 000 000 0
Too Many!!
PWB
COMPONENTSSTENCIL
PASTE
Digital Data
Let us take some examples!
Offset resist window opening up trackand possibly touching BGA pad
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)
What can GO WRONG?
The Electronic Designer
I like complicated functions on a small surface!!
Is the Electronic Design the ROOT CAUSE?
The CAD People
What is IPC-7351B?
My footprints hasn't changed
since 1903!
Is the CAD the ROOT CAUSE?
Is PCB OK?
Is the Bare Board the ROOT CAUSE?
What do you see here?
How many PTH do you have in your PCB?
PWB
COMPONENTSSTENCIL
PASTE
Digital Data
Loading
Loading
CAMScreen print
Jet printer
Is the Screen printing the ROOT CAUSE?
Pick & Place
Pick & Place
Pick & Place
Pick & Place
Is the Pick & Place the ROOT CAUSE?
Pick & Place
Repair of BGA
X-Ray
Vapor Phase
Reflow
AOI Unload
Unload
Is the Reflow or Wave Soldering the
ROOT CAUSE?
Reflow
AOI Unload
Unload
Wave SolderingCleaning
Manual Assa
It is many Process Steps!
The cause of a bad SolderJoint can be hard to find!
It is NOT a piece of cake!
What shall You Do Now?
No Control – Just Deliver?
Deliver and hope for the Best?
Start to Repair and Lose €€€?
What can it COST?
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%
IPC-A-610E
It is not OK!!
SUMMARY
What shall You do?
COST
IPC Class 3
GO WRONG