文档介绍：John Isaac Designing Your PCB for High Reliability John Isaac Director of Market Development Systems Design Division Reliability – What Makes Electronic Systems Fail? ? Heat? Vibration ? ic interference High Temperatures ? 2010 Mentor Graphics Corp. Company Confidential ? PCB assembly faults ? PCB fabrication EMI Vibration & Shock PCB Assembly Faults The Issues with Testing for Reliability ? Reliability problems do not manifest themselves as quality issues in manufacturing — A system could pass final test after manufacturing — This system could fail in the field due to prolonged stress ? 2010 Mentor Graphics Corp. Company Confidential ? Creating prototypes and testing does not always work — The test could pass on the prototype given a small but eptable failure rate — Very difficult to simulate years of stress in test chambers — Multiple prototypes & testing increase time-to-market and cost The Answer –“Virtual Prototyping” During Design ? Software can predict reliability issues —Avoid design practices that may lead to failures —Can simulate months in a test chamber —Predict product failures in hours that can take years to fail in the field ? 2010 Mentor Graphics Corp. Company Confidential tor’s Virtual Prototyping Products for Increased Reliability Re - spins Reduces Prototypes & Re-spins Results in Higher Reliability Products, Faster X ? 2010 Mentor Graphics Corp. Company Confidential tems Design Prototypes NPI petitive Product ? Low Cost ? Reliable ? High Performance ? Small form factor ? Functionality Re - spins Virtual Prototyping Here AVOIDING PCB ASSEMBLY RELIABILITY ISSUES ? 2010 Mentor Graphics Corp. Company Confidential IABILITY ISSUES DFM (with reliability checks) Can Avoid Design Issue that may Cause Field Failures ? 2010 Mentor Graphics Corp. Company Confidential ber of DFM Categories Available Fabrication 277 Assembly 270 Packaging Substrate 105 Microvia 45 Panel 38 Reliability issues are those that may not manife