Evaluation of 10v Chip Polymer Tantalum Capacitors for Space Applications

CONTENTS Introduction ........................................................................................................................................................................ 1 Part types ............................................................................................................................................................................ 3 Leakage currents ................................................................................................................................................................. 4 Absorption and Intrinsic Currents .................................................................................................................................. 4 Effect of Voltage............................................................................................................................................................ 4 Effect of Temperature .................................................................................................................................................... 5 Degradation of leakage currents during HALT .................................................................................................................. 6 Technique ...................................................................................................................................................................... 7 HALT results ................................................................................................................................................................. 8 Step Stress Testing at 85 oC ..........................................................................................................................................10 Effect of vacuum on characteristics of tantalum capacitors ..............................................................................................10 Degradation of AC and DC characteristic during HTS .....................................................................................................11 T530, T525 and MnO2 Capacitors During Long-Term HTS at 100 oC ........................................................................11 T530, T525 and MnO2 Capacitors During HTS at 125 oC, 150 oC, and 175 oC...........................................................12 Automotive Grade Capacitors During HTS at 125 oC and 150 oC ...............................................................................14 Degradation Model for HTS .........................................................................................................................................15 Discussion and Recommendations ....................................................................................................................................16 Degradation of Leakage Currents During HALT .........................................................................................................17 Effect of vacuum...........................................................................................................................................................17 Degradation of leakage currents during HTS ...............................................................................................................18 Degradation of AC characteristics during HTS ............................................................................................................18 Summary ...........................................................................................................................................................................20 Acknowledgment ...............................................................................................................................................................21 References .........................................................................................................................................................................21