Printed Board Handling and Storage Guidelines [PDF]

Zitiervorschau

PRINTED  BOARD  HANDLING  AND  STORAGE  GUIDELINES  

An  introduction  by  IPC  D-­‐35  subcommittee  member,  Bob  Lazzara  

Prior to the IPC-1601

To  preserve  the  quality   and  reliability  of  PCBs   during  shipment  and   storage,  military   specifications  and   guidelines  defined   packaging  methods  

Prior to the IPC-1601

Many  documents  were     •  obsolete   •  incomplete   •  did  not  address  lead-­‐ free  assembly   processes   •  did  not  cover  newer   laminates  or  final   surface  finishes  

Prior to the IPC-1601

Alternative  surface   finishes  added  concerns/ requirements  for  PCB   packaging  &  handling  to   preserve  surface  finish   and  assure  solderability.  

Scope and Intent

The  IPC-­‐1601  provides   suggestions  for  proper:   •  handling   •  packaging  materials   and  methods   •  environmental   conditions   •  storage  for  PCBs  

Scope and Intent

The  1601  intends  to   protect  PCBs  from:   •  contamination   •  physical  damage   •  solderability   degradation   •  electrostatic  discharge   (ESD)   •  moisture  uptake  

Scope and Intent

Moisture  absorbed  by   PCBs  will  expand  at   soldering  temperatures.       The  resulting  vapor   pressure  can  lead  to:   •  internal  delamination   •  excessive  strain  on   plated-­‐hole  walls  (e.g.,   post  separation)  

Scope and Intent

The  1601  covers:   •  Fabrication  of  the  PCB   •  Delivery  to  Assembler   •  Receiving  the  PCB   •  Stocking  the  PCB   •  Assembly  &  soldering  

Scope and Collaboration

Targets  these  functions   involving  PCB…   •  •  •  •  •  • 

DESIGNERS   MANUFACTURING   ASSEMBLY   SHIPPING   STORAGE   WARRANTY  

Information  was  supplied  by   individual  serving  all  of  these   functions,  as  well  as  material   and  equipment  suppliers.  

Guidelines for Fabricators: Raw Materials

PCB  Raw  Material   Handling  &  Storage   guidelines  include:   •  Laminates   •  Handling  and  Foreign   Object  Concerns   •  Environmental   Concerns   •  Inner  Layer  Production   right:  foreign  object  between  inner   layers,  Drilling  operation.  

Guidelines for Fabricators: Raw Material Examples

Core  Materials,  Prepreg   and  Resin  Coated  Foils   are  sensitive  to  damage.   Guidelines  for  handling  &   storage  of  prepregs  and   resin  coated  foils  include:    

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Handle  prepreg  by  the  edges   using  clean  latex  or  nitrile   gloves.   • 

Store  prepreg  flat  in  a  cool,  dry   environment  (<  23  °C  [73  °F],