Transient voltage inhibits TVS device ----- TVS Introduction

Keywords: transient voltage inhibiting TVS device The anti-interference and overvoltage protection of electronic products is now very important. To this end, the transient voltage suppresss the TVS device. The TVS device is a combination of regulator diode. To eliminate interference and overvoltage protection. The principle is: when the voltage of the TVS device (regulator) reaches the voltage regulator tube (PN junction), its PN is soft breakdown, at which time the TVS device (protected equipment) Or IC) The voltage at both ends is no longer raised or absorbed. Readers may ask: Is the pressure sensitive not also have the same function? In fact, there is still a difference between them. First, the response time of the pressure sensitive resistor is far less than the TVS device (the response time of the pressure sensitive resistor is typically μs level, and the TVS device is NS level); the second is that the pressure sensitive static capacitance is large (for hundreds or thousands of tin method) . There will be a large leakage current during work. The TVS device is only a few talents, even less than the treepic method, so the leakage current is small when working. Some even less than 0.1μA; three, the clamp voltage of the pressure sensitive resistor is not a fixed value, but a large range, the accuracy reaches the TVS device clamp voltage of the military level, and its accuracy is even 0.1V. Because of this, the TVS device has been widely used in power grid, intersection / DC power, precision instrument sensor, communication equipment, video equipment, electronic switch, relay contact, I2C bus, Internet network port, etc. anti-interference and overvoltage protect. The TVS device has two orientation and two-way types in the internal structure (see Figure 1), where the unidirectional is mainly applied to the DC circuit, and the bidirectional type is suitable for the AC circuit. There is a cylindrical package like a normal diode in its package. There are also multi-foot flat packages like integrated blocks. Its pin is inequalized by 2 pins to 16 pins (see Figure 2, Figure 3). The transient power range of the TVS device is generally between 300 and 5000W. Anti-insulating voltage. 1882. ~ 40kV. The clamp voltage is 1.5-440V. It can meet the needs in the above field.

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