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7 / 72 page  5 EIA CODE Percent Capacity Change Over Temperature Range RS198 Temperature Range X7 -55°C to +125°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% The Capacitor 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% W +22%, -56% +22%, -66% X +15%, -15% +15%, -25% Y +30%, -70% +30%, -80% Z +20%, -20% +20%, -30% Table 2: MIL and EIA Temperature Stable and General Application Codes 50 40 30 20 10 0 12.5 25 37.5 50 Volts AC at 1.0 KHz 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 Figure 2 Figure 3 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. 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. 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 temperature range, the second represents the upper limit of the operating temperature range and the third symbol represents the capacitance change allowed over the operating temperature range. Table 2 provides a detailed explanation of the EIA system. Effects of Voltage – Variations in voltage affects only the capacitance and dissipation factor. 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 voltage coefficient of dissipation factor for various AC voltages at 1 kilohertz. Applications of different frequencies will affect the percentage changes versus voltages. Cap. Change vs. A.C. Volts AVX X7R T.C. D.F. vs. A.C. Measurement Volts AVX X7R T.C. |
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