FAQ Capacitors Inductors (Coils) EMC Components Voltage / Current / Temperature Protection Devices Sensors and Sensor Systems (-) Ceramic Switching / Heating, Piezo Components, Contactors, Buzzers and Microphones Ferrites and Accessories Magnets Facet FAQ Search List - Product Categories L1 PTC Thermistors as Heating Elements Facet FAQ Search List - Product Categories L2 Facet FAQ Search List - Product Categories L3 Product Categories 製品カテゴリ Produktkategorien 产品类别 Products (-) Structure, material Troubleshooting Facet FAQ Search List - FAQ Category 1 Product Categories L1 Product CategoriesCapacitorsInductors (Coils)EMC ComponentsRF ComponentsVoltage / Current / Temperature Protection DevicesSensors and Sensor SystemsCeramic Switching / Heating, Piezo Components, Contactors, Buzzers and MicrophonesTransformersFerrites and AccessoriesPower SuppliesMagnets Product Categories L2 Product Categories Product Categories L3 Product Categories FAQ Category CategoriesProductsMeasurementElectrical CharacteristicsEnvironmental CompatibilityOperation manualOperational descriptions by objectiveProduct Quality and Service LifeReliabilityStructure, materialTechnical support toolsTroubleshootingOthersAbout myTDK Structure, material Q. When should Ag or Al metallization be used as PTC electrode? PTC Thermistors as Heating Elements