TVS tube, also known as transient suppression diode, is a highly efficient electrostatic protection device in the form of diode.
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TVS is a kind of high performance protection device in the form of diode. When the poles of the TVS diode are subjected to reverse transient high energy impact, it can change the high impedance between the poles into low impedance at a speed of 10 to the minus 12 seconds, absorbing up to several kilowatts of surge power, so that the voltage clamp between the poles is located at a predetermined value, effectively protecting the precision components in the electronic circuit from damage by various surge pulses. Because it has the advantages of fast response speed, large transient power, low leakage current, small breakdown voltage deviation, easy control of clamp voltage, no damage limit, small size, etc., it has been widely used in computer systems, communication equipment, AC/DC power supplies, automobiles, electronic ballasts, household appliances, instruments (watt-hour meters), etc. 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 driver reception protection, motor electromagnetic interference suppression, audio/video input, sensor/transmission, work Control loop, relay, contactor noise suppression and other fields.
In the circuit generally works in the reverse cut-off state, at this time it does not affect any function of the circuit. TVS in the specified reverse application conditions, when the circuit due to lightning, various electrical interference caused by a large transient interference voltage or pulse current, it in a very short period of time (up to 1×10-12 seconds) quickly into the anti-pilot state, and the circuit voltage clamped in the required safety value, Thus effectively protect the precision components in the electronic circuit from damage. After the interference pulse passed, TVS turned into reverse cut-off state again. Because the clamping voltage is lower than the maximum voltage of other devices in the circuit during the reverse conduction, it plays a protective role for other components. TVS can withstand instantaneous pulse power up to kilowatts, and its clamping time is <1ns[1]. TVS can be divided into unidirectional and bidirectional TVS according to polarity. One-way TVS is generally suitable for direct current circuit, two-way TVS is generally suitable for AC circuit. Because TVS plays a protective role in rapid action, long life, easy to use, so in the field of transient voltage protection has a very wide range of applications.
The parameters are described as follows:
1, breakdown voltage V(BR)
2, the maximum reverse pulse peak current Ippm
3, the maximum reverse working voltage VRWM
4, the maximum clamping voltage VC(max)
5, reverse pulse peak power Pppm
6, capacitor CPP
7. Leakage current IR
TVS is mainly used for fast overvoltage protection of circuit components. It can "absorb" surge signals with power up to several kilowatts. TVS has the advantages of small size, large power, fast response, no noise, low price, and many other advantages, it is widely used, such as: household appliances; Electronic instruments; Appearance; Precision equipment; Computer system; Communication equipment; RS232, 485 and CAN communication ports; ISDN protection; I/O port; IC circuit protection; Audio and video input; Ac, DC power supply; Motor, relay noise suppression and other fields. It can effectively protect against overvoltage shock caused by human error such as lightning and load switch.
