B25650 and B25750


B25640 (resin), B25650 (gas), B25750 (oil)

  • High peak current handling capability
  • Low losses
  • Long useful life
  • Very high reliability
  • Rectangular case
  • Flat windings
  • Overpressure switch possible
  • Self-healing properties



B25640 (resin)

  • Very low ESL
  • Open capacitors
  • Rectangular case
  • Compact size (flat winding)
  • Self-healing properties
  • Customer specific design
  • Cost optimized
TractionDrivesPower TransmissionRenewable EnergiesAC FilteringConverter

Safety recommendations for power capacitors (ZVEI)

ISO/TS 22163 Certificate Málaga

Material Data Sheets for Film Capacitors

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Power Capacitors for DC applications

DC power capacitors

In the case of Power Capacitors for DC Applications TDK offers different technology products depending on the application such as for standard ones, e-mobility (low LSI/ULSI HF), harsh environment (hermetically sealed) or for high partial discharge applications in power converters (resin top).

Power Capacitors for AC filtering

AC power capacitors

With the increasing importance of power quality, TDK is focusing on AC filtering solutions. They are available with different terminal configurations and electrical parameters. Thanks to their simple design (round winding in an aluminum can), these widely used components offer high reliability at the same time. TDK portfolio features two basic AC filter capacitor designs: single-phase and three-phase capacitors. When AC capacitors are used as filters, they suppress harmonic distortions and reactive power problems, thus improving power quality and reliability. 

Innovative power capacitor technologies for wide band-gap semiconductors

Conventional semiconductors based on silicon are being replaced by wide band-gap (WBG) technologies based on GaN and SiC. These demand a great deal from the passive components – particularly the DC link capacitors. Thanks to its supreme competence in materials and design, TDK offers innovative solutions, enabling the advantages of the new semiconductors.

For switched applications in power electronics such as power supplies and converters, WBG semiconductors offer the advantage that they can be operated with switching frequencies in the triple-digit kHz range. At the same time, they feature steep pulse edges, thereby achieving greater energy efficiency. Due to these high switching frequencies, film capacitors are increasingly being used as DC link capacitors. In order to minimize the lead lengths, and thus the parasitic inductances, the capacitors are connected directly to the WBG modules by means of busbars. The problem here is that WBG semiconductors are operated with high barrier termination temperatures, which can also be conducted via the busbars to the DC link capacitors. The temperature limit of conventional film capacitors with a dielectric of biaxially oriented polypropylene (BOPP), however, is only 105 °C.

New dielectric allows high-temperature applications 

TDK has succeeded in developing a dielectric that can also be used continuously at high temperatures. This involves a combination of two basic materials. One component is semicrystalline polypropylene, which is ideal for processing into films; the other is amorphous cyclic olefin copolymer (COC), which can tolerate high temperatures. The resulting dielectric (COC-PP) can be used at temperatures in excess of 125 °C with considerably lower derating, while retaining the good self-healing properties of BOPP. In addition, this enables extremely thin films of just 3 µm to be manufactured. Figure 1 shows the significantly improved shrinking and derating behavior of COC-PP in comparison with conventional BOPP.

Outstanding performance 

Like all capacitors, film capacitors also feature a complex ESR, a series connection comprising an ohmic and a capacitive part. Accordingly, this produces a frequency-dependent resistance that increases sharply as the frequencies rise. This rise is essentially caused by inhomogeneous impedances, skin effects and winding geometries, leading to unwanted resonances and electromagnetic effects. The result is a heating of the capacitor. This has a particularly negative effect if the internal design of a capacitor consists of several windings. Different internal lead lengths and other factors then lead to a pronounced frequency-dependent current distribution across the individual windings, as shown in Figure 2.

With the aid of CAD and FEA (finite element analysis) simulation software TDK has now developed HF (high-frequency) power capacitors with an optimized internal design. Even at the high frequencies and temperatures at which WBG semiconductors are operated, these capacitors offer high performance with low losses, thanks to a minimized ESR (Figure 3).

The new B25640* series of HF power capacitors of the (Figure 4) is especially tailor-made for SiC semiconductors. With rated voltages of between 700 and 2200 V DC and capacitance values from 370 to 2300 µF, the capacitors are suitable for the new generation of converters for traction, industrial drives and renewable energy applications. With the COC-PP dielectric the capacitors can also be operated without voltage derating at temperatures of up to 125 °C. One great advantage of the new capacitors is their extremely low ESL value of just 10 nH. This means that, even at high, rapidly switched currents, their voltage overshoot remains very low, so that in most cases they even make snubber capacitors unnecessary.