Design for Reliability: PCBs - DfR Solutions
Design for Reliability: PCBs - DfR Solutions
Design for Reliability: PCBs - DfR Solutions
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Tensile <strong>for</strong>ce onpad and LaminateSAC Solder is More Vulnerable to StrainSources of strain can be ICT, stuffingthrough-hole components,shipping/handling, mounting to a chassis,or shock events.NEMI study showed SAC is moreSensitive to bend stress.Laminate LoadBearingCapabilityLFPbSnLF limitPbSn limitPCB deflectionOnew ay Analysis of Load (kN) By Solder Alloy0.50.450.4Load (kN)0.350.30.250.20.150.1SACSolder AlloySn-PbEach PairStudent's t0.05Means and Std Dev iations© 2004 - 2007 2010LevelSACSn-PbNumber1818Mean0.2308590.416101Std Dev0.0565910.040408Std Err Mean0.013340.00952Lower 95%0.202720.39601Upper 95%0.259000.43620