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SR219E104CAA Datasheet(PDF) 9 Page - AVX Corporation |
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SR219E104CAA Datasheet(HTML) 9 Page - AVX Corporation |
9 / 72 page 7 Impedance vs. Frequency Effect of Capacitance – AVX SpinGuards Impedance vs. Frequency Effect of Dielectric – AVX DIPGuards Impedance vs. Frequency Effect of Lead Length – Military CKR05 .01mF Typical Curve of Aging Rate X7R Dielectric Effects of Mechanical Stress – High “K” dielectric ceramic capacitors exhibit some low level piezoelectric reactions under mechanical stress. As a general statement, the piezoelectric output is higher, the higher the dielectric con- stant of the ceramic. It is desirable to investigate this effect before using high “K” dielectrics as coupling capacitors in extremely low level applications. Reliability – Historically ceramic capacitors have been one of the most reliable types of capacitors in use today. The approximate formula for the reliability of a ceramic capacitor is: L o = V t X T t Y L t V o T o where Lo = operating life Tt = test temperature and L t = test life To = operating temperature in °C V t = test voltage Vo = operating voltage X,Y = see text Historically for ceramic capacitors exponent X has been considered as 3. The exponent Y for temperature effects typically tends to run about 8. The Capacitor .001mF .01mF .1mF .33mF 1 10 100 1000 Log Frequency, MHz 10.00 1.00 0.10 0.01 1 10 100 200 Log Frequency, MHz 10.0 1.0 0.1 1 10 100 1000 Log Frequency, MHz 10.0 1.0 0.1 100.0 .500" .250" .062" 0" 1 10 100 1000 10,000 100,000 Hours +1.5 0 -1.5 -3.0 -4.5 -6.0 -7.5 Characteristic Max. Aging Rate %/Decade C0G (NP0) X7R Z5U Y5V None 2 3 5 Figure 9 Figure 8 |
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