TVs (transient voltage suppressor) diode, also known as transient suppression diode, is a new type of high-efficiency circuit protection device widely used. It has extremely fast response time (sub nanosecond) and quite high surge absorption capacity. When its two ends are subjected to instantaneous high-energy impact, TVs can change the impedance value between the two ends from high impedance to low impedance at a very high speed, so as to absorb an instantaneous large current and clamp the voltage at both ends at a predetermined value, so as to protect the following circuit elements from the impact of transient high-voltage spike pulse.
The working principle of TVS diode is similar to that of common zener diode. If it is higher than the breakdown voltage on the sign, TVS diode will turn on. Compared with zener diode, TVS diode has higher current conduction capacity. When the two poles of TVS diode are impacted by reverse transient high energy, it changes the high impedance between the two poles into low impedance at the speed of 10 ^ - 12s, and absorbs surge power up to several kilowatts. The voltage between the two poles is clamped at a safe value to effectively protect the precision components in the electronic circuit from the damage of surge pulse.
Transient (transient) voltage suppression diode is called TVs device for short. Under the specified reverse application conditions, when it bears a high-energy transient overvoltage pulse, its working impedance can immediately drop to a very low conduction value, allow large current to pass through, and clamp the voltage to a predetermined level, so as to effectively protect the precision components in the electronic circuit from damage.
TVs can withstand an instantaneous pulse power of up to kW, and its clamping response time is only 1ps (10 ^ - 12s).
The forward surge current allowed by TVS can reach 50 ~ 200A under the condition of T = 25 ℃ and T = 10ms.
Bidirectional TVs can absorb instantaneous large pulse power in both positive and negative directions and clamp the voltage to a predetermined level. Bidirectional TVs is suitable for AC circuits and unidirectional TVs is generally used for DC circuits.