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12101C474KAT2A Datasheet(PDF) 90 Page - AVX Corporation |
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12101C474KAT2A Datasheet(HTML) 90 Page - AVX Corporation |
90 / 99 page ![]() 89 In specifying capacitance change with temperature for Class 2 materials, EIA expresses the capacitance change over an operating temperature range by a 3 symbol code. The first symbol represents the cold temperature end of the tempera- ture range, the second represents the upper limit of the operating temperature range and the third symbol represents the capacitance change allowed over the operating temper- ature range. Table 1 provides a detailed explanation of the EIA system. Effects of Voltage – Variations in voltage have little effect on Class 1 dielectric but does affect the capacitance and dissipation factor of Class 2 dielectrics. The application of DC voltage reduces both the capacitance and dissipation factor while the application of an AC voltage within a reasonable range tends to increase both capacitance and dissipation |factor readings. If a high enough AC voltage is applied, eventually it will reduce capacitance just as a DC voltage will. Figure 2 shows the effects of AC voltage. Capacitor specifications specify the AC voltage at which to measure (normally 0.5 or 1 VAC) and application of the wrong voltage can cause spurious readings. Figure 3 gives the volt- age coefficient of dissipation factor for various AC voltages at 1 kilohertz. Applications of different frequencies will affect the percentage changes versus voltages. Typical effect of the application of DC voltage is shown in Figure 4. The voltage coefficient is more pronounced for higher K dielectrics. These figures are shown for room tem- perature conditions. The combination characteristic known as voltage temperature limits which shows the effects of rated voltage over the operating temperature range is shown in Figure 5 for the military BX characteristic. General Description Figure 2 50 40 30 20 10 0 12.5 25 37.5 50 Volts AC at 1.0 KHz Cap. Change vs. A.C. Volts X7R Figure 3 Curve 3 - 25 VDC Rated Capacitor Curve 2 - 50 VDC Rated Capacitor Curve 1 - 100 VDC Rated Capacitor Curve 3 Curve 2 Curve 1 .5 1.0 1.5 2.0 2.5 AC Measurement Volts at 1.0 KHz 10.0 8.0 6.0 4.0 2.0 0 D.F. vs. A.C. Measurement Volts X7R EIA CODE Percent Capacity Change Over Temperature Range RS198 Temperature Range X7 -55°C to +125°C X6 -55°C to +105°C X5 -55°C to +85°C Y5 -30°C to +85°C Z5 +10°C to +85°C Code Percent Capacity Change D ±3.3% E ±4.7% F ±7.5% P ±10% R ±15% S ±22% T +22%, -33% U +22%, - 56% V +22%, -82% MIL CODE Symbol Temperature Range A -55°C to +85°C B -55°C to +125°C C -55°C to +150°C Symbol Cap. Change Cap. Change Zero Volts Rated Volts R +15%, -15% +15%, -40% S +22%, -22% +22%, -56% W +22%, -56% +22%, -66% X +15%, -15% +15%, -25% Y +30%, -70% +30%, -80% Z +20%, -20% +20%, -30% Table 1: EIA and MIL Temperature Stable and General Application Codes EXAMPLE – A capacitor is desired with the capacitance value at 25°C to increase no more than 7.5% or decrease no more than 7.5% from -30°C to +85°C. EIA Code will be Y5F. Temperature characteristic is specified by combining range and change symbols, for example BR or AW. Specification slash sheets indicate the characteristic applicable to a given style of capacitor. |
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