TDK YNA15 series noise absorbers

TDK Corporation’s YNA15 series noise absorbers in case size 1005 (IEC) have been designed to suppress voltage ringing that can be caused by switchmode power supplies (SMPSs).

The noise absorbers have a rated voltage of 25 and a rated capacitance of 0.1 µF. Depending on the type, the series features ESR values of between 50 mΩ and 1 Ω. When the component is used on the input side of the SMPS, for example, EMI noise caused by voltage ringing can be reduced by 3.5 dB (approx one third). The series thus effectively suppresses voltage ringing without reducing the power efficiency. A further benefit of the YNA15 series is that it can replace three components: the resistor and capacitor in the snubber circuit and the decoupling capacitor.

Due to their design, SMPSs may require capacitors with higher ESR values than offered by standard MLCCs. In order to meet these requirements and to suppress unwanted EMI noise, TDK developed an internal electrode structure that claims to enable the design of noise absorbers with any desired ESR rating. As a result, EMI noise can be suppressed effectively in the frequency range where the voltage ringing occurs.