TVS Diodes and Metal-Oxide Varistors (MOVs) are both commonly used components for transient voltage protection in electronic circuits, but they have some key differences.
1.Definition of TVS Diode
TVS Diodes, also known as Transient Voltage Suppression Diodes, are semiconductor devices that can rapidly respond to high voltage transients and divert excess current away from sensitive components.
They have a fast response time and can handle high surge currents. TVS Diodes are typically used for protecting low voltage circuits from voltage spikes and transients caused by events such as lightning strikes, electrostatic discharge (ESD), and switching noise. They have a low clamping voltage and provide precise voltage clamping.
2.Definition of Metal-Oxide Varistors
Metal-Oxide Varistors (MOVs) are voltage-dependent resistors that can conduct high currents when a high voltage is applied to them. MOVs are made of a ceramic material with a metal oxide composition.
When the voltage across the MOV exceeds its breakdown voltage, it starts to conduct and diverts the excess voltage away from the protected circuit. MOVs have a relatively slower response time compared to TVS Diodes and can handle high energy transients. They are commonly used for protecting power lines and equipment from overvoltage events.
3.Differences between TVS Diodes and Metal-Oxide Varistors
The main differences between TVS Diodes and Metal-Oxide Varistors lie in their response time, surge handling capability, and applications. TVS Diodes offer fast response times, precise clamping voltages, and are suitable for protecting low voltage circuits. MOVs have slower response times but can handle higher surge currents and are often used for protecting power lines and equipment from overvoltage events.
4.How to Select a Varistor to Protect Circuit
When selecting a varistor to protect a circuit, there are several factors to consider:
Voltage Rating: Choose a varistor with a voltage rating that is equal to or greater than the maximum voltage the circuit will experience. This ensures proper protection against voltage spikes.
Energy Rating: Consider the energy rating of the varistor, which indicates its ability to absorb energy from transient events. Higher energy ratings provide better protection.
Clamping Voltage: The clamping voltage is the voltage at which the varistor starts conducting significant current. It should be below the maximum allowable voltage for the protected circuit.
Response Time:The response time of the varistor is the time it takes to start conducting current after the voltage exceeds the clamping voltage. A faster response time provides quicker protection.
Size and Mounting:Consider the size and mounting options of the varistor, ensuring it fits within the circuit and can be easily integrated.
By carefully considering these factors, you can select the appropriate varistor to effectively protect your circuit from voltage surges and transients.
5.How to Select a TVS diode to Protect Circuit
When selecting a TVS (Transient Voltage Suppression) diode to protect a circuit, there are several factors to consider:
Voltage Rating: Determine the maximum voltage that the TVS diode will be exposed to. Choose a diode with a voltage rating higher than the maximum expected voltage.
Clamping Voltage:The clamping voltage is the voltage at which the TVS diode starts to conduct significant current. Select a diode with a clamping voltage lower than the maximum acceptable voltage for the protected circuit.
Peak Pulse Current: Consider the maximum transient current that the TVS diode can handle. Ensure that the diode's peak pulse current rating is higher than the expected transient current.
Response Time:The response time of the TVS diode is the time it takes to clamp the voltage after a transient event. Choose a diode with a fast response time to provide effective protection.
Package Type:Consider the physical size and package type of the TVS diode to ensure it can be easily integrated into the circuit.
Temperature Range:Verify that the TVS diode can operate within the temperature range of the circuit. Choose a diode with a suitable temperature rating.
By considering these factors, you can select a TVS diode that provides reliable protection for your circuit against transient voltage events.
6.TVS Diodes and Varistors from Topdiode and UF Capacitors
Topdiode and UF Capacitors are 2 brands under Topdiode group manufacturing company.
Topdiode offers different diode including TVS diode.
UF Capacitors produces leaded metal oxide varistor of reliable quality.
You could simply get both products from one single supplier which is time and cost efficiency.
Simply send RFQ to inquiry@ufcapacitors.com for quote. There will be experienced engineers do cross reference and choose the match series upon your request.
Cross reference list for MOV
