Power Electronics
Large Can Capacitors Handle Up To 22,000 Microfarads

Large Can Capacitors Handle Up To 22,000 Microfarads

The U-37 family of screw terminal aluminum electrolytic capacitors from United Chemi-Con are offered in capacitance ranges of from 1,5000 to 22,000 microfarads provides high ripple current and long life to extend reliability in power-inverter systems.

The family has 3 series.  The U37F has an endurance rating of 5,000 hours at +85 °C with the rated ripple current applied.  Useful life can exceed 150,000 hours at 45 °C and 1.5 times the ripple current.  The U37L has an endurance rating of 10,000 hours at 85 °C with the rated ripple current applied.  Useful life is 175,000 at +45 °C and 1.5 times the ripple current.  The U37X has an endurance rating of 15,000 hours at 85 °C with the rated ripple current applied.  It's useful life is also 175,000 @45°C and 1.5 times the ripple current applied.

Other specifications for the U37 family include voltage ratings from 350 VDC to 500 VDC, standard capacitance tolerance of +20%, and leakage current of 0.02 CV (uA) or 5 mA, whichever is smaller, after 5 minutes at +25°C.  A 12,000 uF, 500-V capacitor has a can size of 89 x 219 mm, maximum ESR (equivalent series resistance) of 8 m) at +25 °C and 120 Hz, and rated ripple current of 33.5 A RMS at +85 °C and 120 Hz, 40.2 A RMS at +85 °C and 300 Hz, and 46.9 A RMS at +85 °C and 3 kHz.

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