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CID+ Practice Exam

QuestionAnswer
Affects dimensional stability and changes the electrical characteristic in the material which can cause potential difÏculties in assembly Moisture absorption
What are the 3 general methods of plating material on PCBs? Immersion, electroless, and electrolytic
What are the benefits of metallic coatings / final(surface) finish? Corrosion prevention, Improved long-term solderability
Simplest of the wet processes; involves a simple galvanic replacement reaction; the more noble metal in the solution picks up electrons from the less noble metal immersed in the solution and plates out Immersion Plating
Why would you use immersion plating? The thickness is limited to a very thin coating as it is a simple replacement reaction
Why is Immersion finishes more beneficial than HASL? Immersion has a flatter base for attachment
What are the assembly challenges/problems with HASL process? Coplanarity / solder thickness varies, solder crowning, less uniformity
When a Stencil fits flat on pad, opening is smaller than the land pattern in all dimensions Gasketing
What is the problem with gasketing in HASL? Uneven surfaces cause leakage of paste underneath the stencil
What other surface finishes are better/flatter than HASL? Gray tin, nickel/gold, nickel/palladium gold, immersion "white" tin, immersion silver, ENIG
What surface finish is good for BGAs and surface mount? ENIG
Why would you use a washable solder mask / what is the advantage? Washable masks are removable; they come off in a cleaning operation
What is plugging? Process to ensure that plated through holes are prevent from being contaminated by the assembly cleaning and plating process chemistries
For liquid photo imageable masks, what via process does IPC recommend? Plugging
For dry film masks, what via process does IPC recommend? Tenting
What will manufacturers do to get proper flow characteristics of the prepreg material and gain better performance of the multilayer structure? Manufacturers will mix and match the various prepreg products
For surface mount and for the outer layers to be heat-resistant, what can the manufacturer do to help this? Polyimide material can be used for the outer layers of a multilayer while inner layers are standard epoxy-grade product
Created by: user-1990063
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