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... | @@ -75,19 +75,31 @@ |
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## FMC Connectors
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## FMC Connectors
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- [Samtech](http://www.samtec.com/search/vita57fmc.aspx)
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- [Samtech VITA 57 FMC](http://www.samtec.com/search/vita57fmc.aspx)
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- Examples of orders (CERN only)
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- [Example order 1 - CERN
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- [Example order 1 - CERN
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only](https://edh.cern.ch/Document/SupplyChain/DAI/4233545)
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only](https://edh.cern.ch/Document/SupplyChain/DAI/4233545)
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(pos.3, typo: is lpc, not hpc)
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(pos.3, typo: is lpc, not hpc)
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- [Example order 2 - CERN
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- [Example order 2 - CERN
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only](https://edh.cern.ch/Document/SupplyChain/DAI/4452669)
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only](https://edh.cern.ch/Document/SupplyChain/DAI/4452669)
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<!-- end list -->
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The assembly of FMC connectors has proven to be critical. Please take
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the following suggestions into account.
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- [Soldering Process Improvement of Critical SMT Connectors and for
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- [Soldering Process Improvement of Critical SMT Connectors and for
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the Retention of Press-fit SFP Cages, Tho Vu et
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the Retention of Press-fit SFP Cages, Tho Vu et
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al](http://www.ipcoutlook.org/pdf/soldering_process_improvement_connectors_ipc.pdf),
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al](http://www.ipcoutlook.org/pdf/soldering_process_improvement_connectors_ipc.pdf),
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IPC APEX EXPO Proceedings.
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IPC APEX EXPO Proceedings.
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- Samtec suggests using a 6-mil solder stencil when assembling boards
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with the FMC connectors. Assembly of other components with fine
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geometry such as QFN packages may benefit from the more standard
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5-mil solder stencil. In this case, Opal Kelly has had good success
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in expanding the FMC stencil apertures from their specified round
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aperture to a 0.037-inch square aperture with 0.003-inch rounded
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corners. The increase in paste application from aperture makes up
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for the reduced paste volume from the thinner stencil. (source:
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[Opal Kelly Shuttle LX1 User’s
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Manual](http://www.opalkelly.com/library/ShuttleLX1-UM.pdf)).
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-----
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-----
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... | @@ -168,5 +180,5 @@ specific front-panel with a cutout for the FMC carrier's front panel. |
... | @@ -168,5 +180,5 @@ specific front-panel with a cutout for the FMC carrier's front panel. |
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-----
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-----
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Erik van der Bij - 9 July 2012
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Erik van der Bij - 13 November 2012
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