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T490B227M004AG Datasheet(PDF) 7 Page - Kemet Corporation |
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T490B227M004AG Datasheet(HTML) 7 Page - Kemet Corporation |
7 / 16 page © KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com T2004_T490 • 9/22/2016 77 Tantalum Surface Mount Capacitors – Standard Tantalum T490 Series Commercial Grade MnO2 Recommended Voltage Derating Guidelines −55°Cto40°C % Change in Working DC Voltage with Temperature 100% of VR VR Recommended Maximum Application Voltage 50% of VR VR 40°C to 85°C % Change in Working DC Voltage with Temperature 50% of VR VR Recommended Maximum Application Voltage 50% of VR VR 85°C to 125°C % Change in Working DC Voltage with Temperature 20% of VR VR Recommended Maximum Application Voltage 20% of VR VR Ripple Current/Ripple Voltage Permissible AC ripple voltage and current are related to equivalent series resistance (ESR) and the power dissipation capabilities of the device. Permissible AC ripple voltage which may be applied is limited by two criteria: 1. The positive peak AC voltage plus the DC bias voltage, if any, must not exceed the DC voltage rating of the capacitor. 2. The negative peak AC voltage in combination with bias voltage, if any, must not exceed the allowable limits specifiedforreversevoltage.SeetheReverseVoltage section for allowable limits. Themaximumpowerdissipationbycasesizecanbe determined using the table at right. The maximum power dissipation rating stated in the table must be reduced with increasing environmental operating temperatures. Refer to the table below for temperature compensation requirements. Temperature Compensation Multipliers for Maximum Ripple Current T≤25°C T≤40°C T≤85°C 1.00 0.90 0.40 T= Environmental Temperature The maximum power dissipation rating must be reduced with increasing environmental operating temperatures. Refer to the Temperature Compensation Multiplier table for details. KEMET Case Code EIA Case Code Maximum Power Dissipation (P max) mWatts at 25°C w/+20°C Rise A 3216–18 75 B 3528–21 85 T 3528–12 70 Using the P max of the device, the maximum allowable rms ripple current or voltage may be determined. I(max) = √P max/R E(max) = Z √P max/R I = rms ripple current (amperes) E = rms ripple voltage (volts) P max = maximum power dissipation (watts) R = ESR at specified frequency (ohms) Z = Impedance at specified frequency (ohms) 0% 20% 40% 60% 80% 100% 120% −55 25 40 85 105 125 Temperature (°C) 50% 20% % Change in Working DC Voltage with Temperature Recommended Maximum Application Voltage |
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