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CDR04BP182BJW4 датащи(PDF) 2 Page - Kemet Corporation |
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CDR04BP182BJW4 датащи(HTML) 2 Page - Kemet Corporation |
2 / 30 page ©KEMET Electronics Corporation, P.O. Box 5928, Greenville, S.C. 29606, (864) 963-6300 CERAMIC CHIP CAPACITORS 5. Dissipation Factor: Measured under same conditions as capacitance. (See Table 3) Dissipation factor (DF) is a measure of the losses in a capacitor under AC application. It is the ratio of the equivalent series resistance to the capacitive reac- tance, and is usually expressed in percent. It is normal- ly measured simultaneously with capacitance, and under the same conditions. The vector diagram below illustrates the relationship between DF, ESR and impedance. The reciprocal of the dissipation factor is called the “Q” or quality factor. For convenience, the “Q” factor is often used for very low values of dissipa- tion factor especially when measured at high frequen- cies. DF is sometimes called the “loss tangent” or “tan- gent ”, as shown in Figure 2. 6. Impedance: Since the parallel resistance (IR) is normally very high, the total impedance of the capacitor can be approximated by: The variation of a capacitor's impedance with fre- quency determines its effectiveness in many applica- tions. At high frequency more detailed models apply - see KEMET SPICE models for such instances. 7. Insulation Resistance: Measured after 2 minutes electrification at 25°C and rated voltage: Limits per Table 3. Insulation Resistance is the measure of a capacitor to resist the flow of DC leakage current. It is sometimes referred to as “leakage resistance”. Insulation resis- tance (IR) is the DC resistance measured across the terminals of a capacitor, represented by the parallel resistance (IR) shown in Figure 1. For a given dielectric type, electrode area increases with capacitance, result- ing in a decrease in the insulation resistance. Consequently, insulation resistance limits are usually specified as the “RC” (IR x C) product, in terms of ohm- farads or megohm-micro-farads. The insulation resis- tance for a specific capacitance value is determined by dividing this product by the capacitance. However, as the nominal capacitance values become small, the insulation resistance calculated from the RC product reaches values which are impractical. Consequently, IR specifications usually include both a minimum RC prod- uct and a maximum limit based on the IR calculated Figure 1 C = Capacitance IR ESR C ESL ESL = Equivalent Series Inductance IR = Insulation Resistance ESR = Equivalent Series Resistance ESR x 100 DF(%) = Xc Xc 2 π fC 1 = Figure 2 δ Ζ O Xc ESR Z = ESR + (X L - X C ) 22 Where : Z = Total Impedance ESR = Equivalent Series Resistance X C = Capacitive Reactance = 1/(2 πfC) X L = Inductive Reactance = (2 πf) (ESL) Figure 3 Table 3 – Specified Electrical Limits Parameter Temperature Characteristics C0G X7R/X5R Z5U Capacitance & Dissipation Factor: Measured at following conditions: C0G – 1kHz and 1 vrms if capacitance >1000 pF 1MHz and 1 vrms if capacitance ≤1000 pF X7R/X5R/Y5V – 1kHz and 1 vrms* if capacitance ≤ 10 µF Y5V Z5U – 1kHz and 0.5 vrms DF Limits: 50 - 200 volts – 25 volts – 16 volts – 6.3/10 volts – Dielectric Strength: At 2.5 times rated DC voltage Insulation Resistance (IR): At rated DC voltage, whichever of the two is smaller. To get IR limit, divide MΩ−µF value by the capacitance and compare to GΩ limit. Select the lower of the two limits. Temperature: Range, °C Capacitance Change (without DC voltage) 0.10% 0.10% -------- -------- 2.5% 3.5% 3.5% 5.0% 2.5% 5.0% ** ** Pass Subsequent IR Test 1,000 MΩ – µF or 100 GΩ (100,000 MΩ) 1,000 MΩ – µF or 100 GΩ (100,000 MΩ) 100 MΩ – µF or 10 GΩ (10,000 MΩ) -55 to +125 0 ± 30 ppm/°C -55 to +125 ±15% +10 to +85 +22% -56% 5.0% 7.0% 7.0% 10.0% 100 MΩ – µF or 10 G (≥16 volt) 50 MΩ – µF or 10G (≤10v) (10,000 MΩ) -30 to +85 +22% -82% 4.0% 4.0% ------- X7R/X5R/Y5V – 120Hz and 0.5 vrms if capacitance > 10 µF X7R: -55 to +85 ±15% X5R: **X5R Cap DF <25V <564 5.0% <25V ≥564 10.0% *Note: Some values measured at 1⁄2 volt, see X7R Table for specific details on pages 7 4 and 75. 68 |
Аналогичный номер детали - CDR04BP182BJW4 |
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Аналогичное описание - CDR04BP182BJW4 |
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