TVS (Transient Voltage Suppression) is a voltage limiting protection device that functions similarly to a varistor. It also utilizes the nonlinear characteristics of the device to clamp overvoltage to a lower voltage value to protect the downstream circuit. The tolerance is expressed in watts (W). Based on the excellent characteristics of TVS tubes, bidirectional TVS is suitable for AC circuits and can absorb high-power pulses that occur instantaneously in both positive and negative directions. Unidirectional TVS is generally used in DC circuits. TVS can be used for lightning protection, voltage dissipation, anti-interference, and absorption of surge power

(1) Adding TVS diodes to the signal and power lines can prevent the failure of microprocessors or microcontrollers caused by momentary surges, such as electrostatic discharge effects, AC power surges, and noise from switching power supplies

(2) The electrostatic discharge effect can release pulses exceeding 10000V and 60A, and can last for 10ms; However, typical TTL devices will be damaged when exposed to 10V pulses exceeding 30ms. By using TVS diodes, it is possible to effectively absorb pulses that can cause device damage and eliminate interference caused by switches between buses (Crosstalk)

(3) Placing the TVS diode between the signal line and ground can prevent unnecessary noise from affecting the data and control bus

TVS diodes are currently widely used in computer systems, communication equipment, AC/DC power supplies, automobiles, electronic ballasts, household appliances, instruments and meters (electricity meters) RS232/422/423/485、 I/O、LAN、ISDN 、ADSL、USB、MP3、PDAS、GPS、CDMA、GSM、 The protection of digital cameras, common mode/differential mode protection, RF coupling/IC drive receiving protection, motor electromagnetic wave interference suppression, audio/video input, sensor/transmission, industrial control circuits, relays, contactor noise suppression, and other fields