TDK Corporation has announced an expansion of its YFF series of 3-terminal filters for automotive applications, introducing models with higher voltage ratings up to 35 V and capacitance values up to 4.7 µF. Mass production of the upgraded series began in June 2025. These filters are designed to suppress voltage fluctuations and high-frequency noise, which are critical concerns in modern automotive electronic systems that continue to shrink in size.
As vehicle electronics become increasingly compact, managing system stability has become more complex. Traditional approaches often involve using multiple capacitors, but with limited space, reducing the number of components is essential. TDK’s 3-terminal filters, known for their low equivalent series inductance (ESL), offer an efficient solution by combining compactness with high performance.
The latest enhancements are made possible through refined material selection and product design, enabling a wider range of voltage and capacitance options. The new 35-V variant achieves an insertion loss of 40 dB between 4 MHz and 2 GHz, making it suitable for various power line applications, including both input and output sides of power-supply systems. Meanwhile, the 4.7 µF variant provides an insertion loss of 30 dB from 300 kHz to 3 GHz, delivering superior performance as an input capacitor in mitigating voltage variation and suppressing high-frequency noise.
In practical terms, depending on the application environment, these new filters can potentially halve the number of components required compared to multilayer ceramic capacitors (MLCCs), offering significant space and cost advantages for automotive system designers.
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