Capacitors Hybrid Capacitor Series for 48 V Automotive Applications

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48 V vehicle electrical systems, driver assistance systems, and electrified drives are placing increasingly higher demands on power supply. With new hybrid aluminum electrolytic capacitors for up to 80 V and high ripple currents, Taiyo Yuden is responding to this trend.

Taiyo Yuden expands its portfolio with the hybrid aluminum electrolytic capacitors of the HVX (-K) and HTX (-K) series. The new components are AEC-Q200 qualified and intended for 48 V automotive applications.

The hybrid capacitors are intended for noise suppression and smoothing of supply voltage in power supply circuits, for example, for control functions such as electric power steering or safety-critical systems like driver assistance systems (ADAS).

Compared to the previous HVX and HTX series, the new hybrid capacitors offer significantly improved capacitance properties. The portfolio includes a total of 46 variants in seven sizes ranging from 6.3 mm × 7.7 mm (approx. 0.25 by 0.30 inches)  to 12.5 mm × 16.5 mm (approx. 0.49 by 0.65 inches). Among them is the RAHTX181M1RGP5005K type with a rated voltage of 80 V in a 12.5 × 16.5 mm housing and a permissible ripple current of 3,900 mA_rms at 135 °C (275°F).

Series production began in June 2026 at the Shirakawa (Fukushima Prefecture) and Aomori (Aomori Prefecture) plants of subsidiary Elna.

Technological Background

Hybrid capacitors use both a conductive polymer material and an electrolyte. This allows them to combine the low ESR (Equivalent Series Resistance) of conductive polymers with the self-healing ability of the oxide layer that characterizes aluminum electrolytic capacitors. In this way, high electrical performance and high reliability can be combined.

In recent years, the supply voltage in automotive electrical systems has increasingly risen to 48 V to improve the efficiency of electrical systems. This has led to a growing demand for hybrid capacitors that can handle both high voltages and large currents.

At the same time, with the growing number of electronic control units—such as those for driver assistance systems—and the increased prevalence of electrified drives and electric vehicles, the number of power supply circuits is rising. Hybrid capacitors are increasingly being used for noise suppression and smoothing the supply voltage.

To meet these requirements, Taiyo Yuden has optimized all materials used in the hybrid capacitors and developed the HVX (-K) and HTX (-K) series. These achieve a rated voltage of up to 80 V with a maximum operating temperature of 135 °C (275°F).

Taiyo Yuden aims to further drive the development of market-oriented products and continuously expand its range of hybrid capacitors.

Applications

The hybrid capacitors are designed for noise suppression and voltage smoothing in power supply circuits. Typical applications include control units for electric power steering, driver assistance systems (ADAS), as well as other electronic control and safety systems in vehicles.