IPC CID EXAM|ALREADY GRADED A+ UPDATE
2025|2026|GUARANTEED ACCURATE ANSWERS
Terms in this set (159)
dielectric constant and the loss The board material has significant influence on the electrical
tangent performance of the circuit from what two effects?
Piercing post, Sequentially built- What are the 4 types of build-up multilayers?
up multilayer, Passive substrate,
Filled via sequential co-
laminated substrate
The temperature at which anamorphous polymer changes from
Glass transition temperature (Tg) being a hard and relatively-brittle condition to be in a viscous or
rubbery state
Affects dimensional stability and changes the electrical
Moisture absorption characteristic in the material which can cause potential
difficulties in assembly
Immersion, electroless, and What are the 3 general methods of plating material on PCBs?
electrolytic
Corrosion prevention, Improved What are the benefits of metallic coatings / final(surface) finish?
long-term solderability
, Simplest of the wet processes; involves a simple galvanic
replacement reaction; the more noble metal in the solution picks
Immersion Plating
up electrons from the less noble metal immersed in the solution
and plates out
The thickness is limited to a very Why would you use immersion plating?
thin coating as it is a simple
replacement reaction
Immersion has a flatter base for Why is Immersion finishes more beneficial than HASL?
attachment
Coplanarity / solder thickness What are the assembly challenges/problems with HASL process?
varies, solder crowning, less
uniformity
Stencil fits flat on pad, opening is smaller than the land pattern in
Gasketing
all dimensions
Uneven surfaces cause leakage What is the problem with gasketing in HASL?
of paste underneath the stencil
Gray tin, nickel/gold, What other surface finishes are better/flatter than HASL?
nickel/palladium gold,
immersion "white" tin, immersion
silver, ENIG
ENIG What surface finish is good for BGAs and surface mount?
Washable masks are Why would you use a washable solder mask / what is the
removable; they come off in a advantage?
cleaning
2025|2026|GUARANTEED ACCURATE ANSWERS
Terms in this set (159)
dielectric constant and the loss The board material has significant influence on the electrical
tangent performance of the circuit from what two effects?
Piercing post, Sequentially built- What are the 4 types of build-up multilayers?
up multilayer, Passive substrate,
Filled via sequential co-
laminated substrate
The temperature at which anamorphous polymer changes from
Glass transition temperature (Tg) being a hard and relatively-brittle condition to be in a viscous or
rubbery state
Affects dimensional stability and changes the electrical
Moisture absorption characteristic in the material which can cause potential
difficulties in assembly
Immersion, electroless, and What are the 3 general methods of plating material on PCBs?
electrolytic
Corrosion prevention, Improved What are the benefits of metallic coatings / final(surface) finish?
long-term solderability
, Simplest of the wet processes; involves a simple galvanic
replacement reaction; the more noble metal in the solution picks
Immersion Plating
up electrons from the less noble metal immersed in the solution
and plates out
The thickness is limited to a very Why would you use immersion plating?
thin coating as it is a simple
replacement reaction
Immersion has a flatter base for Why is Immersion finishes more beneficial than HASL?
attachment
Coplanarity / solder thickness What are the assembly challenges/problems with HASL process?
varies, solder crowning, less
uniformity
Stencil fits flat on pad, opening is smaller than the land pattern in
Gasketing
all dimensions
Uneven surfaces cause leakage What is the problem with gasketing in HASL?
of paste underneath the stencil
Gray tin, nickel/gold, What other surface finishes are better/flatter than HASL?
nickel/palladium gold,
immersion "white" tin, immersion
silver, ENIG
ENIG What surface finish is good for BGAs and surface mount?
Washable masks are Why would you use a washable solder mask / what is the
removable; they come off in a advantage?
cleaning
