TDK launches 125V aluminium electrolytic capacitors for EV and industrial applications

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TDK has expanded its aluminium electrolytic capacitor portfolio with new 125 V-rated components and upgraded existing 63 V products to support higher-voltage electric mobility and industrial applications.

The company introduced 125 V versions of its B43693/B43793 axial-lead and soldering star aluminium electrolytic capacitor series, while upgrading the 63 V range of its B41687/B41787 series.

The capacitors are designed for DC-link capacitor banks used in systems operating between 48 V and 120 V, including small electric vehicles, micromobility platforms, forklifts, electric boats and humanoid robots.

The B43693/B43793 series covers voltage ratings from 125 V to 250 V, offers capacitance between 56 µF and 650 µF, and supports ripple currents of up to 21.6 A. The components operate at temperatures of up to 140°C and are rated for a service life of 2,500 hours at ambient temperatures up to 125°C.

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According to TDK, the new 125 V variant is intended for 96 V system designs where space is limited, operating temperatures are high and stable energy buffering is required under changing load conditions.

The upgraded B41687/B41787 series is available in voltage ratings from 25 V to 63 V and offers capacitance ranging from 510 µF to 4,800 µF. The series operates at temperatures of up to 150°C and uses the same axial-lead and soldering star design, allowing a common mechanical layout across different voltage classes.

TDK mentioned that supporting higher DC-link voltage in a single capacitor eliminates the need to connect multiple capacitors in series. This simplifies capacitor-bank design while improving system reliability and efficiency by removing the need for voltage-balancing resistors.

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The capacitors are rated to withstand vibration levels of up to 20 g as standard, with 60 g versions available on request. Their mounting design allows installation on both printed circuit boards (PCBs) and busbars.

TDK also said mounting the 125 V B43693/B43793 capacitors on a heat sink can more than double their rated ripple current. According to the company, this allows designers to reduce the number of capacitors required in a capacitor bank and lower assembly costs. 

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The company added that all four capacitor series feature low equivalent series resistance (ESR) and high ripple current capability, helping reduce power losses and improve thermal performance in inverter DC-link applications.