EMI suppression capacitors feature self-healing dielectric

22nd April 2015
Barney Scott

TDK Corporation has presented a series of EPCOS X2 EMI suppression capacitors with stable capacitance values, even under extremely humid conditions. The B3292 H/J series for operating voltages of up to 305VAC comprises types with rated capacitances ranging from 0.1 to 15µF and lead spacings from 15 to 37.5mm, operating over a temperature range from -40 to +110°C.

The capacitors, which employ a Metallised Polypropylene Dielectric (MKP), also feature excellent self-healing properties that allow weak dielectric areas to be burned out in the event of overvoltages.

The robust capacitors perform reliably under severe ambient conditions, easily passing the damp heat test. Here, they must operate for at least 1000 hours at a temperature of 85°C, a relative humidity of 85% and a voltage of 240VAC without a change in capacitance of 10% or more.

The X2 capacitors are suited for applications in harsh environments, such as the capacitive power supplies in outdoor energy meters, for example, and in across-the-line industrial applications.

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