V27RA8 Circuit Protection

TVS (Transient Voltage Suppressor) - Varistors, MOVs (Metal Oxide Varistors) are components that are used to protect circuits from voltage spikes by providing a low impedance path between the circuit and ground. The V27RA8 is an unipolar varistor that is designed to protect circuits from over-voltage conditions that can cause catastrophic failure or damage. The component is made of a ceramic disc with concentric metal electrodes and a sandwiched Z160N positive temperature coefficient (PTC) resistor.

The application field of V27RA8 varistor is mainly related to sensitive applications such as automotive, medical technology, and consumer electronics. In automotive applications the varistor is used to protect the circuit from electrical impulses generated by the spark plug. In medical technology it can be used to suppress the voltage generated by the electric shock of defibrillators and pacemakers. In consumer electronics it is used to protect circuits from electrostatic discharge (ESD) and overvoltage transients.

The working principle of the V27RA8 varistor is based on its capacitive properties. When an excessive voltage is applied, the capacitor acts as a current path which bypasses the circuit thus protecting it. This current is then diverted to the ground, protecting the device from potential damage or destruction. The Z160N PTC resistor limits the current that can flow through the capacitor, preventing the varistor from overheating and damaging the system.

The V27RA8 varistor has a wide range of features and characteristics that make it a suitable choice for various applications. It has a low capacitance range of 7pF to 30pF, allowing it to be used in sensitive circuits and applications where high capacitive reactance is undesirable. Its high operating temperature of 125°C allows it to handle higher voltage transients and current. The Z160N PTC provides additional protection against overload conditions.

In conclusion, the V27RA8 varistor is a very useful component that is used in a wide range of applications. Its low capacitance and high operating temperature make it suitable for sensitive circuits and applications with high voltage transients. The Z160N PTC provides additional protection against overload conditions. This makes the V27RA8 varistor an ideal choice for use in many applications.