For electronic device design, it is important to allow necessary signals to pass while to block unwanted signals (noise). Some pattern designs of a printed circuit board (PCB) can be influenced by ESD (electrostatic discharge). By visualizing the behavior of ESD intruding into the PCB, we can confirm the effectiveness of ESD countermeasures for the PCB design. In this article, we introduce effective GND pattern designs and the use of ESD protection components to enhance ESD robustness.

Protective measures are essential for ESD (Electrostatic Discharge) to prevent malfunctions or failures in electronic devices. However because these components are mounted directly on the line, selecting inappropriate ESD protective components can affect the signal on the line even under normal conditions. Examples include high-speed communication lines with differential signals, such as those used in automotive communications' CAN (Controller Area Network) and Ethernet. These can exhibit significant impacts, not only deteriorating communication quality but also potentially affecting EMC (Electromagnetic Compatibility) performance in the worst cases.

TDK offers a lineup of multilayer chip varistors to protect equipment from failing due to surge voltages. In the TDK Product Center, you can find individual product data sheets and product catalogs describing various electrical characteristics. However, (1) it does not show how to read or use the data sheet. (2) It is difficult to narrow down the parts that are optimal for countermeasures against surge voltage. Therefore, the problems are to spend time on component selection ~ evaluation.
In order to solve these problems, we will introduce a simulation tool for multilayer chip varistors that can select the optimal components for countermeasures against surge voltage.