Voltage Protection Devices Product Top Page Catalog Tech Notes Technical Support Tools FAQ Chip Varistors / Ceramic Transient Voltage Suppressors Simulation This is a tool for selecting chip varistors/CTVS that can provide the optimum surge countermeasures for your circuit. TVCL - TDK Virtual Component Library The TVCL is simulation model that reproduce the characteristics of TDK electronic components in circuit simulators. EPCOS Design Tools Design tools and simulation models for EPCOS brand components