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Testing Voltage Sensitive Capacitors

Testing Voltage Sensitive Capacitors. 2008 Board Test Workshop. 8/22/2008. Purpose. Document the behavior of a class of capacitors whose value is dependent on the voltage applied Generate discussion concerning how to deal with this in production. Outline. Customer case study

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Testing Voltage Sensitive Capacitors

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  1. Testing Voltage Sensitive Capacitors 2008 Board Test Workshop 8/22/2008

  2. Purpose • Document the behavior of a class of capacitors whose value is dependent on the voltage applied • Generate discussion concerning how to deal with this in production

  3. Outline • Customer case study • Agilent findings • Q&A Discussion

  4. Customer Case Study Customer found accuracy issue after ECO Simplified measurement as standalone Graphed results and posted to our public on-line discussion forum: http://forums.tm.agilent.com/phpBB2/viewforum.php?f=56

  5. Customer Case Study

  6. Agilent Findings Agilent obtained and ordered parts MPN – Murata GRM21BR61A106KE19L 10uF, X5R, 10Vdc, 0805 package Tested 10uF cap using HP4284A LCR meter Confirmed behavior of the capacitors

  7. Results From HP4284A LCR Meter

  8. Agilent Findings • Obtained opinion of materials expert • Summary • X5R is an “ok” dielectric (technically a class II) • Not extremely stable over voltage and temperature • See figures 2 & 4 from AVX document • Typical for X7R, slightly better than X5R

  9. Figure 4 From AVX Document

  10. Figure 2 From AVX Document

  11. Customer Data Reprise Within 10% of 10uF from 0.5-5 Volts, makes good bypass but test at 0.1V

  12. Conclusion • There exists a class of capacitors whose value changes with applied voltage • Test volts not same as operating volts • Care must be taken when debugging a production board test for these devices

  13. Q&A • Have you seen this? • How often? • Do you care? • Bulk bypass • AC Blocking Caps (SERDES) • Need precise value • How manage in production test

  14. Thank You

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