Varistors, as important overvoltage protection components in electronic circuits, play an irreplaceable role in absorbing surge voltages and protecting other electronic components from damage. Therefore, varistors are widely used in many electronic devices.
Varistors are available in various models, but unlike batteries which are easier to choose, selecting the right varistor model is a crucial issue for those unfamiliar with varistors. Improper selection of varistor models can not only fail to protect the circuit but also lead to more serious problems.
For those unfamiliar with varistors, choosing the appropriate varistor model requires understanding key parameters and how to select them.
Understand the Basic Parameters of Varistors:
Varistor Voltage: Also known as breakdown voltage or threshold voltage, it refers to the voltage across the varistor terminals under a specified current (usually 1mA). Generally, the varistor voltage should be higher than the peak operating voltage of the protected circuit to ensure that the varistor does not conduct under normal operating conditions.
Current Rating: This refers to the peak pulse current that the varistor can withstand without damage under specified conditions (e.g., ambient temperature of 25°C).
Clamping Voltage: This is the peak voltage value that the varistor terminals can withstand when a specified surge current passes through it. To ensure reliable protection, the residual voltage of the selected varistor must be lower than the withstand voltage level of the protected object.
How to Select the Varistor Model:
Refer to Product Manuals: When selecting a varistor model, refer to relevant product manuals or technical data to understand the performance parameters and application scenarios of various models.
Consult Industry Experts: If you are unsure how to choose a varistor, consult industry professionals or technical support personnel. They can provide suitable solutions and recommendations based on your requirements.
Conduct Experimental Validation: When purchasing varistors, experimental validation can be conducted to confirm whether the selected varistor model meets the requirements. Through experiments, performance indicators such as the protective effect, service life, and reliability of the varistor can be assessed.
Understanding the various parameters of varistors is essential for selecting the right varistor model to ensure effective operation.
This article is provided by JYH HSU (JEC) Electronics. JEC is a research, development, production, and sales-oriented company specializing in manufacturing and selling various electronic components such as capacitors and resistors.
Post time: Apr-18-2025