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