IPC CID / COMPLETE EXAM WITH
DETAILED QUESTIONS AND
ANSWERS / GRADED A+
What do performance classes reflect?
Progressive increases in sophistication, functional performance, and
frequency/intensity of inspection or stress testing
What are the three kperformance kclasses?
1-General kElectronics k2-Dedicated kService k3-High kreliability
Who kis kthe kend kuser?
The kend kuser kis kthe kindividual kor kagency kthat kcontracts kthe kprinted
kboard kor kassembly kto kbe kdesigned kand kmanufactured
Who kdetermines kthe kclass kof ka kproduct?
The kend kuser
What kwould kbe kin kclass k3 kperformance?
Military, kmedical, ketc.
What kis kambient ktemperature?
The ksurrounding kenvironment kthat kcomes kinto kcontact kwith kyour
kproduct
What kdo kproducibility klevels ktell kus?
Increasing kcomplexity kof ktooling, kmaterials, kand kprocessing. kYields
kincrease kas kcosts kdecrease, ketc.
What kincreases kwith keach kproducibility klevel?
Sophisitication
What kis kthe kzaxis kaspect kratio?
Ratio kbetween kthe knominal kthickness kof kthe kboard kand kthe ksmallest
kdrill ksize.
What kis kthe kmost kimportant kspecial kconsideration kin
kterms kof kelectrical kfunctionality kthat ka kdesigner kmust
kconsult kthe kEE? kSpecial kkeep kout kor kkeep kin kareas kof kthe
kboard.
, Where kshould khigh kfrequency kcircuits kbe kplaced?
NEar kthe kconnector
Where kshould kfiltering kcaps kbe kplaced?
Near kthe ksource kof kpower/gnd k(at kthe kconnector)
What kis kleast kimportant kto kroute kin kanalog kcircuits?
Power kand kground
What kis ka kmajor kconsideration kfor kcomponent kplacement?
Will kbackwards kcompatibility kbe knecessary?
What kis kOhm's klaw?
V=IR
What kis kan kimportant kbasic krule kfor ka kdesigner kof ka kboard?
Terminate kunused klogic kpins kwith ka kpull-down kor kpull-up kresistor.
What kproduct ksafety ktesting kregards kflame kretardants?
UL k94
How kthick kis khalf kounce kcopper?
0.7 kmils k(17 kum kthick)
What kis kthe ksubtractive kprocess?
Unwanted kcopper kis ketched kaway
What kis kthe kadditive kprocess?
Only kwanted kcopper kis kadded kto kthe kboard
What kmust khappen kimmediately kafter kdrilling kthe kholes kin
kthe kboards?
Hole kdeburring
What kis kan kunsupported khole?
A khole kin kthe kprinted kboard kthat kdoes knot kcontain kplating kor kother
kconductive kreinforcement
What kis ka ksupported khole?
A khole kthat khas kthe kinside ksurfaces kplated kor kotherwise kreinforced
What kis ka kburied kvia?
A kvia kthat kextends konly kbetween kconductive klayers kwith kno kexposure
kto kthe koutside kworld
How kdo kyou kmeasure kannular kring kon kan kexternal klayer?
Including kthe kplating kthe khole.
How kdo kyou kmeasure kannular kring kon kan kinternal klayer?
Excluding kthe kplating kin kthe khole.
What kare kminimum kannular kring krequirements kdefined kby?
Internal ksupported, kexternal ksupported kand kexternal kunsupported
kholes.
What kis kthe kmost kimportant kfactor kin kdetermining kthe kminimum
kland ksize kfor ka khole?
The kmax kdrill khole kdiameter
What kare keach kof kthe kfollowing: ka+2(b+c)+d
, Min kland ksize=max kdrill khole+2(min kannular
kring+etchback)+manufacturing
What kis ktolerance?
The kamount kof kvariation kallowed kin ka kdimension kor klocation
What kis kbreakout?
Drilled khole kbreaking kout kof kthe kedge kof kthe kcopper kland
What kis kbreakout kacceptability?
Varies kamong kclass, kwhere kdifferent kamounts kof kbreakout kare kallowed.
What kis kthe kMMC kand kLMC?
Can khave kdimensions kgiven kin ka krange, kwhere kMMC kis kmost kmaterial
kcondition kand kLMC kis kleast kmaterial kcondition
What kis kthe krecommended kelectrical kspacing kfrom kboard kedge?
16 kmils kPLUS kthe kelectrical krequirement
What kis kit kcalled kwhen ka kland kis konly kpresent kto
kbalance kthe kconstruction kof kthe kboard?
Nonfunctional klands
What kis kthe kclearance kon knonfunctional klands?
0.25 kmm k(10 kmils)
What kis kthermal krelief?
Thermal krelief kis kintended kto kremove ksufficient kcopper kto kavoid
kheatsinking kduring kthe ksoldering kprocesses kwhile kstill kmeeting
kminimum kcurrent kcarrying krequirements
How kdo kyou kcalculate kthermal kweb ksize?
0.6(1/number kof kwebs)landsize
What kdoes kCTE kstand kfor kand kwhat kare kits kunits?
Coefficient kof kthermal kexpansion kand kppm/C
What kis kthe kCTE kfor kcopper, kbrass kand kaluminum?
Copper: k17-18 kppm/C; kbrass: k19 kppm/C; kaluminum: k24 kppm/C
What kis kspecial kabout kthermal kvias?
They kmust kbe kconnected kto kboard-level kplanes
What kdoes kMTBF kmean?
Mean ktime kbetween kfailures; ka khigher kmean ktime kmeans kyour kboard kis
kmore kreliable
What kis kthe kdifference kbetween kburn-in ktesting kand kHAST?
HAST kis kusually kdestructive kwhile kburn-in kis knon-destructive kand
kworks kto kfind kinfant kmortality kissues
What kis ka ktest kcoupon?
Companies kfind kthem kbeneficial kand kincorporate kthem kinto kboard
kproduction kpanels kto knot kwaste ka kgood kboard kin kproduction
What kis ktrue kof ktest kprobes?
They kmust kmake kcontact kwith kevery knet, kand kcan kbe kensured kwith kthe
ksupplied knet-list
DETAILED QUESTIONS AND
ANSWERS / GRADED A+
What do performance classes reflect?
Progressive increases in sophistication, functional performance, and
frequency/intensity of inspection or stress testing
What are the three kperformance kclasses?
1-General kElectronics k2-Dedicated kService k3-High kreliability
Who kis kthe kend kuser?
The kend kuser kis kthe kindividual kor kagency kthat kcontracts kthe kprinted
kboard kor kassembly kto kbe kdesigned kand kmanufactured
Who kdetermines kthe kclass kof ka kproduct?
The kend kuser
What kwould kbe kin kclass k3 kperformance?
Military, kmedical, ketc.
What kis kambient ktemperature?
The ksurrounding kenvironment kthat kcomes kinto kcontact kwith kyour
kproduct
What kdo kproducibility klevels ktell kus?
Increasing kcomplexity kof ktooling, kmaterials, kand kprocessing. kYields
kincrease kas kcosts kdecrease, ketc.
What kincreases kwith keach kproducibility klevel?
Sophisitication
What kis kthe kzaxis kaspect kratio?
Ratio kbetween kthe knominal kthickness kof kthe kboard kand kthe ksmallest
kdrill ksize.
What kis kthe kmost kimportant kspecial kconsideration kin
kterms kof kelectrical kfunctionality kthat ka kdesigner kmust
kconsult kthe kEE? kSpecial kkeep kout kor kkeep kin kareas kof kthe
kboard.
, Where kshould khigh kfrequency kcircuits kbe kplaced?
NEar kthe kconnector
Where kshould kfiltering kcaps kbe kplaced?
Near kthe ksource kof kpower/gnd k(at kthe kconnector)
What kis kleast kimportant kto kroute kin kanalog kcircuits?
Power kand kground
What kis ka kmajor kconsideration kfor kcomponent kplacement?
Will kbackwards kcompatibility kbe knecessary?
What kis kOhm's klaw?
V=IR
What kis kan kimportant kbasic krule kfor ka kdesigner kof ka kboard?
Terminate kunused klogic kpins kwith ka kpull-down kor kpull-up kresistor.
What kproduct ksafety ktesting kregards kflame kretardants?
UL k94
How kthick kis khalf kounce kcopper?
0.7 kmils k(17 kum kthick)
What kis kthe ksubtractive kprocess?
Unwanted kcopper kis ketched kaway
What kis kthe kadditive kprocess?
Only kwanted kcopper kis kadded kto kthe kboard
What kmust khappen kimmediately kafter kdrilling kthe kholes kin
kthe kboards?
Hole kdeburring
What kis kan kunsupported khole?
A khole kin kthe kprinted kboard kthat kdoes knot kcontain kplating kor kother
kconductive kreinforcement
What kis ka ksupported khole?
A khole kthat khas kthe kinside ksurfaces kplated kor kotherwise kreinforced
What kis ka kburied kvia?
A kvia kthat kextends konly kbetween kconductive klayers kwith kno kexposure
kto kthe koutside kworld
How kdo kyou kmeasure kannular kring kon kan kexternal klayer?
Including kthe kplating kthe khole.
How kdo kyou kmeasure kannular kring kon kan kinternal klayer?
Excluding kthe kplating kin kthe khole.
What kare kminimum kannular kring krequirements kdefined kby?
Internal ksupported, kexternal ksupported kand kexternal kunsupported
kholes.
What kis kthe kmost kimportant kfactor kin kdetermining kthe kminimum
kland ksize kfor ka khole?
The kmax kdrill khole kdiameter
What kare keach kof kthe kfollowing: ka+2(b+c)+d
, Min kland ksize=max kdrill khole+2(min kannular
kring+etchback)+manufacturing
What kis ktolerance?
The kamount kof kvariation kallowed kin ka kdimension kor klocation
What kis kbreakout?
Drilled khole kbreaking kout kof kthe kedge kof kthe kcopper kland
What kis kbreakout kacceptability?
Varies kamong kclass, kwhere kdifferent kamounts kof kbreakout kare kallowed.
What kis kthe kMMC kand kLMC?
Can khave kdimensions kgiven kin ka krange, kwhere kMMC kis kmost kmaterial
kcondition kand kLMC kis kleast kmaterial kcondition
What kis kthe krecommended kelectrical kspacing kfrom kboard kedge?
16 kmils kPLUS kthe kelectrical krequirement
What kis kit kcalled kwhen ka kland kis konly kpresent kto
kbalance kthe kconstruction kof kthe kboard?
Nonfunctional klands
What kis kthe kclearance kon knonfunctional klands?
0.25 kmm k(10 kmils)
What kis kthermal krelief?
Thermal krelief kis kintended kto kremove ksufficient kcopper kto kavoid
kheatsinking kduring kthe ksoldering kprocesses kwhile kstill kmeeting
kminimum kcurrent kcarrying krequirements
How kdo kyou kcalculate kthermal kweb ksize?
0.6(1/number kof kwebs)landsize
What kdoes kCTE kstand kfor kand kwhat kare kits kunits?
Coefficient kof kthermal kexpansion kand kppm/C
What kis kthe kCTE kfor kcopper, kbrass kand kaluminum?
Copper: k17-18 kppm/C; kbrass: k19 kppm/C; kaluminum: k24 kppm/C
What kis kspecial kabout kthermal kvias?
They kmust kbe kconnected kto kboard-level kplanes
What kdoes kMTBF kmean?
Mean ktime kbetween kfailures; ka khigher kmean ktime kmeans kyour kboard kis
kmore kreliable
What kis kthe kdifference kbetween kburn-in ktesting kand kHAST?
HAST kis kusually kdestructive kwhile kburn-in kis knon-destructive kand
kworks kto kfind kinfant kmortality kissues
What kis ka ktest kcoupon?
Companies kfind kthem kbeneficial kand kincorporate kthem kinto kboard
kproduction kpanels kto knot kwaste ka kgood kboard kin kproduction
What kis ktrue kof ktest kprobes?
They kmust kmake kcontact kwith kevery knet, kand kcan kbe kensured kwith kthe
ksupplied knet-list
