Welcome To The EPTAC Webinar Series: Boards: Get The Bare .

Welcome to the EPTAC Webinar Series:Boards: Get the Bare Facts onBare BoardsYou are connected to our live presentation delivered via the internet.The webinar will begin shortly.You will see the presentation slides on your computer monitor.To hear the audio, you must use a telephone.For Audio: Please use a telephoneand call: (616) 883-8055Enter access code: 141-994-1581

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Boards:Get the BareFacts on BareBoards

Board Standards IPC-A-600, Acceptability of PrintedBoards IPC-6012, Qualification andPerformance Specification for RigidPrinted Boards IPC-2221, Generic Standard on PrintedBoard Design4

IPC-A-600 This is the document used to inspectincoming printed circuit boards. It has 4 sections: IntroductionExternal observationInternal observationFlexible and flush boards5

IPC-A-600 Training Two programs exist: CIS – Operator training and is offered in amodular fashionCIT – Trainer certification covers the entirebook.6

Series SpecificationsIPC-6012 and IPC-2221 These are the two documents which areinvoked in the process of having theprinted circuit fabricated. These documents provide designinformation for the artwork, the selectionof materials, solder mask selection andfunctionality, etc.7

Series Specifications List8

Test MethodsAlthough taken from IPC-6012, they arepart of the IPC-TM-650 series. These documents provide directions toperform or conduct certain activities toverify that the product is, in fact, meetingthe specifications.9

Test Methods List2.1. 1E 05/04 Microsectioning2.1.1.2A 05/04 Microsectioning, Semi or Automatic Technique MicrosectionEquipment (Alternate)2.3. 15D 05/04 Purity, Copper Foil or Plating2.3.25C 02/01 Detection and Measurement of Ionizable Surface Contaminants2.3.38C 05/04 Surface Organic Contaminant Detection Test2.3.39C 05/04 Surface Organic Contaminant Identification Test (InfraredAnalytical Method)2.4. 1E 05/04 Adhesion, Tape Testing2.4. 15A 03/76 Surface Finish, Metal Foil2.4.18.1A 05/04 Tensile Strength and Elongation, In-House Plating2.4.21E 05/04 Land Bond Strength, Unsupported Component Hole2.4.22C 06/99 Bow and Twist2.4.28.1D 05/04 Adhesion, Solder Resist (Mask), Tape Test Method10

Design Criteria Examples11

Design Criteria Examples12

Copper Wrap Plating Thickness13

Copper Wrap Plating Thickness14

IPC-6012 Breakout Criteria15

IPC-6012 Conductor WidthCriteria16

IPC-6012 Conductor ThicknessCriteria17

Weave Exposure as an ExampleTopicWhat is it? From IPC-6012 it states, 3.3.2.5 Weave ExposureWeave exposure or exposed/disrupted fibersare acceptable for all classes provided theimperfection does not reduce the remainingconductor spacing (excluding the area(s) withweave exposure) below the minimum. Refer toIPC-A-600 for more information.18

Weave Exposure as an ExampleTopicFrom IPC-A-60019

Weave Exposure as an ExampleTopicHow does it happen? It is a result of the printed circuitlamination process during the foilapplication where there is excessivepressure and low resin content. Whenthe copper is etched away, it appears onthe laminate surface.20

Weave Exposure Discussion It comes from the raw printed circuit boardfabrication process.The question I get is: But I see it in assembly and IPC-A-610 states21

It Happens During Assembly Solder iron destroys the laminate, a toolslips and destroys the laminate. Is thisweave exposure? If the laminate is cut or scraped and thefibers are broken then, yes, it is weaveexposure.22

Example of Damage Laminateand Weave Exposure Laminate is damaged Exposed fibersBroken fibersMay violate minimumelectrical clearance23

Damaged Laminate Weave exposure is considered aconductive surface, so it impactsminimal electrical spacing. Can it be fixed? YES Apply an epoxy over the area to seal off thearea.24

Upcoming . . . May 14th –Getting to Know “The Bible” forRework and Repair – IPC 7711/772125

Further InformationFor questions regarding this webinar,please contact Leo Lambert atleo@eptac.comFor information on any of EPTAC’s or IPC’sCertification Courses, please visit ourwebsite at http://www.eptac.com26

IPC-A-600, Acceptability of Printed Boards IPC-6012, Qualification and Performance Specification for Rigid Printed Boards IPC-2221, Generic Standard on Printed Board Design. 5 IPC-A-600 This is the document used to inspect incoming printed circuit boards.