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Vishay Film Capacitors with High Robustness under High Humidity

LeeKelly
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Vishay Film Capacitors - THB Grade

High reliability and long lifetime have always been key features of film capacitors, due to their featuring dry technology and self-healing properties. With the fast developments in industrial power electronics over the years, the role of a Film Capacitor has been diversified, and are now intensively used in several stages, from EMI filtering to DC-Link.

Many of these power electronics applications aim for reliability and extended mission profiles. Their manufacturer's wish is for a solution that is close to maintenance-free, regardless of location and ambient heat/humidity conditions.

Under heat and high levels of relative humidity, moisture progression may occur through a Film Capacitor, leading to capacitance decrease and ESR rise, in turn, this can hamper performance and lifetime. It is particularly relevant for outdoor applications or critical applications.

Solar Inverters, for example, are an outdoor application that can be exposed to water condensation during idle periods at night, which will then evaporate during the rise in day temperatures, and the Power Electronics device will start operation.

UPS & Motor Drives Systems are often responsible for keeping critical tasks running continuously, despite ambient conditions that can often be of high relative humidity levels.

The video below shows a range of Film Capacitors available from Vishay, that are purposely designed to ensure high stability and performance for long lifetime industrial power electronics.

To ensure stability over the years under harsh operating environments, Vishay Film Capacitors released several ruggedly designed products that meet high THB (Temperature Humidity Biased) testing conditions, ensuring long life with stable electrical parameters despite ambient conditions.

THB Grade Table

 

F340 Series

These products include the F340 series EMI Suppression Capacitors, offering X1, X2 and Y2 EMI filtering that comply with the harshest THB grade, as defined by the normative standard IEC60384-14 ed.4 AMD1. These products are GRADE IIIB – THB: 85°C / 85% R.H. / 1000h at UNAC, per this standard, and are certified by external agencies not only for their safety requirements, but also for the THB testing performed.

MKP1847H Series

For High-performance AC Filtering applications, the MKP1847H delivers a product also compliant with 85°C / 85% R.H. /1000h at Rated AC voltage, and includes segmented metallization on the film, adding an extra layer of safety against a catastrophic dielectric breakdown.

For DC-Link applications, Vishay introduced the MKP1848H, a robust DC-Link capacitor based on the MKP1848. The “H” version of the MKP1848 has a THB level of 85°C / 85% R.H. / 1000h at UNDC, which grants exceptional performance and lifetime in the field.

THB DC-Link Table Vishay

MKP1848 Series

MKP1848H Series

MKP1848Se Series

Downloads

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LeeKelly
Electronics engineer with history in the music industry repairing Guitars, Amps, PA equipment & pretty much anything with a PCB board.
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