One of the properties of PTC thermistors is that when an excessively large current flows, they generate heat by themselves and become highly resistive. With this property, they are used as overcurrent protection devices. This article describes applications for inrush current limiting, overcurrent protection and telecom application.
PTC thermistors have the property that their resistance rises significantly when a certain temperature is exceeded. This property makes them suitable for use as temperature protection devices that detect defined high temperatures to protect circuits from overheating. TDK offers various types of PTC limit temperature sensors and motor protection sensors that incorporate PTC thermistors and serve as temperature protection devices. This article describes typical applications of such sensors.
Varistors can be used as suppressors to protect devices and circuits from transient abnormal voltages including an ESD (electrostatic discharge) and a lightning surge.
For protection from a relatively large surge current (100A to 25kA), leaded disk varistors and SMD disk varistors are suitable. For protection from a larger surge current (approximately 25kA or more), block varistors, and strap varistors are suitable.
This article describes surge protection device applications for LED lighting system, inductive loads such as motors, motor with an electromagnetic brake, SSR (solid-state relay), load dump and field decay, joint boxes and power conditioners of solar power generation systems, important devices using a lightning transformer, and high-energy surge in industrial devices.
SMD or chip varistors are voltage-dependent resistors based on ceramic multilayer technology. They are widely used to protect electronic circuits in consumer devices and telecom, industrial and automotive applications against transient overvoltages, such as electrostatic discharges (ESD) and surge transients.
Chip varistors have both surge absorption capabilities and noise suppressing effects.
See the adaptive application fields of various components for ESD countermeasures as well as the optimal application fields of TDK’s chip varistors / ceramic transient voltage suppressors, CeraDiodes, and multilayer chip protectors.
TDK’s chip varistors in the AVR series, which are made with our own materials, feature high resistance to repeated surges. Products that substitute Zener diodes in compact devices such as solenoid valves and stepping motors, which are rapidly and frequently turned on and off, are also available.
Surge arresters are GDT (gas discharge tube) voltage protection devices. TDK offers a strong lineup of products with a variety of surge current capabilities ranging from lightning protection for power lines to lightning protection for signal lines.
TDK’s chip varistors are ESD protection components that can solve various needs that are specific to audio lines. We shall now explain the various advantages providing the optimal solutions for the audio lines of smartphones.
→ Jump to Tech Note for Chip Varistors / Ceramic Transient Voltage Suppressors
This material describes the characteristics of each protection component, as well as the differences between an MLCC and MLV.
→ Jump to Tech Note for Chip Varistors
Noise Countermeasures in Automotive DC Motors, Contact Protection and Extension of Motor Line in Ring Varistors
→ Jump to Tech Note for Ring Varistors
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