One: tvs tube definition

TVS (TRANSIENT VOLTAGESUPPRESSOR) or transient voltage suppression diode is a new product developed on the basis of the technology of the voltage regulator tube. Its circuit symbol is the same as that of the ordinary zener diode, and its appearance is no different from the ordinary diode. When the two poles are impacted by reverse transient high energy, it can change the high impedance between the two poles to low impedance at a speed of the order of 10-12 seconds, absorbing up to several thousand watts of surge power, making the voltage clamp between the two poles Located at a predetermined value, it effectively protects precision components in electronic circuits from various surge pulses.

Two: TVS tube characteristics

TVS tube has been widely used due to its advantages of fast response time, large transient power, low capacitance, low leakage current, small breakdown voltage deviation, easy control of clamping voltage, no damage limit, small size, and easy installation In computer systems, communication equipment, consumer electronics, power supplies, household appliances and other fields.

Three: tvs tube function

The TVS tube is a high-efficiency protection device in the form of a diode. When the two poles of the TVS diode are impacted by reverse transient high energy, it can change the high impedance between the two poles to low impedance at a speed of the order of 10-12 seconds, absorbing surge power of up to several kilowatts, making The voltage clamp is located at a predetermined value, which effectively protects the precision components in the electronic circuit from various surge pulses. Due to its advantages of fast response time, large transient power, low leakage current, small breakdown voltage deviation, easy control of clamping voltage, no damage limit, small size, etc., it has been widely used in computer systems, communication equipment, communication / DC power supply, automobile, electronic ballast, household appliances, instrumentation, RS232 / 422/423/485, I / O, LAN, ISDN, ADSL, USB, MP3, PDAS, GPS, CDMA, GSM, digital camera Protection, common mode / differential mode protection, RF coupling / IC drive receiving protection, motor electromagnetic interference suppression, audio / video input, sensor / transmission, industrial control circuit, relay, contactor noise suppression and other fields.

In fact, you can put the TVS / ESD diode / VARISTOR varistor together. These components are anti-overvoltage and overcurrent protection components. The main principle is that when high voltage is generated, the components will appear short circuit.

The difference is:

TVS function is similar to VARISTOR, they are connected in parallel with the protected element. When a surge occurs, a short circuit occurs, and a large voltage is introduced into this device so as not to damage the following circuit. When the voltage is normal, the high-impedance (similar to open circuit) line is started normally.

The difference between the two is that TVS is a semiconductor component, which is more expensive but has a longer service life. Only TVS can be used for 'persistent' over-voltage and over-current protection, and the functions of ESD diode and TVS are similar.

TVS also has anti-ESD functions. ESD components have ultra-low capacitance and high-speed signal characteristics. It is mainly used for board-level protection and serial interface applications. If there are ultra-low capacitance / high voltage requirements, ESD diodes can be used.

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