The voltage tolerance of a Metal-Oxide-Semiconductor Field-Effect Transistor is the highest voltage it can withstand. If a MOS tube has a low voltage value, such as less than 20V, it will have the following effects:
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1. Limited circuit design: Due to the low voltage tolerance of the MOS tube, components with voltage levels below 20V need to be selected during the circuit design process, which may limit the performance and selection range of the circuit.
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2. Reliability problems: When the voltage in the circuit exceeds the withstand voltage value of the MOS tube, the MOS tube may be broken down or damaged, thus affecting the stability and reliability of the circuit.
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3. Power supply design requirements: For applications that need to work in high-voltage environments, such as industrial electrical equipment, the low voltage withstand value of MOS tubes may require additional power supply design, including voltage conversion, isolation, etc.
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4. Safety issues: Due to the low voltage withstand value of the MOS tube, if a high voltage source is used in the circuit, it may lead to overvoltage of the circuit, resulting in safety risks.
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Therefore, when designing a circuit or selecting a MOS tube, it is necessary to ensure that the voltage withstand value of the selected MOS tube can meet the design and safety requirements according to the needs of the application.