Automotive YFF Three-Terminal Filters

TDK Corporation has expanded its YFF series of three-terminal filters for automotive applications to include higher voltages of up to 35 V and higher capacitances of up to 4.7 µF. Such components are used to suppress voltage variation and high-frequency noise, which can cause system malfunctions.

With the miniaturization of automotive electronic systems, there is an increasing demand for measures to prevent system malfunctions. Usually, numerous capacitors are employed in such applications. On the other hand, the number of components must be reduced due to the miniaturization of these systems. To address these challenges, three-terminal filters, characterized by a low ESL (equivalent series inductance), are gaining significant demand.

By optimizing the material selection and product design, these products demonstrate a considerably higher withstand voltage, ranging from 6.3 V to 35 V, and a considerably higher capacitance, going from 0.47 μF to 4.7 μF. The 35 V product with an insertion loss of 40 dB (4 MHz to 2 GHz) can be used for a broader range of power lines, including both input and output of power-supply systems, while the 4.7 μF product with an insertion loss of 30 dB (300 kHz to 3 GHz) is more effective as input capacitors than conventional products in reducing voltage fluctuation and countering high-frequency noise. Depending on set usage conditions, it is possible to halve the component count required to suppress voltage fluctuations to the same extent from the MLC.