Simplified vs. Detailed
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The document discusses a software tool called Sherlock that uses simplified component models to rapidly assess interconnect reliability in electronics. Sherlock models approximate the mass and stiffness of components without modeling individual solder joints, in order to reduce complexity. Comparison of simplified and detailed models for a BGA device under board bending showed similar displacement results and principal board strains, indicating the simplified approach accurately captures board behavior.
Simplified vs. Detailed
- 1. © 2004 – 2010 Sherlock Automated Design Analysis™
- 2. © 2004 - 2007© 2004 - 2010 9000 Virginia Manor Rd Ste 290, Beltsville MD 20705 | 301-474-0607 | www.dfrsolutions.com Model Simplifications for Rapid Assessment of Interconnects o Unique scaling challenge of modeling the robustness of soldered interconnects of electronics o Large assembly with thousands of small solder joints (sub mm) o Sherlock uses simplified component structures that approximate the mass and stiffness of the electronic component without modeling the actual interconnects
- 3. © 2004 - 2007© 2004 - 2010 9000 Virginia Manor Rd Ste 290, Beltsville MD 20705 | 301-474-0607 | www.dfrsolutions.com Model Comparison o Quarter symmetric model of BGA device under board bending moment. o Sherlock uses package dependent board level strain fatigue models for vibration predictions
- 4. © 2004 - 2007© 2004 - 2010 9000 Virginia Manor Rd Ste 290, Beltsville MD 20705 | 301-474-0607 | www.dfrsolutions.com Models o Board parameters are identical o Detailed part includes individual solder joints, die, substrate and lid o Simplified part just includes substrate
- 5. © 2004 - 2007© 2004 - 2010 9000 Virginia Manor Rd Ste 290, Beltsville MD 20705 | 301-474-0607 | www.dfrsolutions.com o Identical bending moments applied to board edges Displacement Results ≈ 2% Difference Detailed 0.2618 mm Simplified 0.2672 mm
- 6. © 2004 - 2007© 2004 - 2010 9000 Virginia Manor Rd Ste 290, Beltsville MD 20705 | 301-474-0607 | www.dfrsolutions.com Principal Board Strains Simplified Detailed Similar corner PCB strains
- 7. © 2004 - 2007© 2004 - 2010 9000 Virginia Manor Rd Ste 290, Beltsville MD 20705 | 301-474-0607 | www.dfrsolutions.com Discussion o Based on the board level deflections the difference between the two models will not have a significant impact on the dynamic response of the circuit board. o Both models generate similar PCB strains