3KP75CA application field and working principle

TVS – Diodes are a useful tool in protecting electronic equipment from high power or high-voltage induced stresses. The 3KP75CA voltage-dependent Surface Mounted Silicon Avalanche Diode (SMD) is designed to be placed upstream of sensitive circuitry to protect them from transients.

How it Works

The 3KP75CA is a unidirectional device that has a power dissipation in excess of 350 watts. It has a trigger voltage of 75V and a typical junction capacitance of 5pF. Its non-linear characteristic is such that, when it\'s exposed to a sudden voltage spike of more than 75V, the diode clamps it down to a safe voltage level allowing the supply voltage to return to its original state.

When the transient voltage exceeds the specified peak power rating, the 3KP75CA starts to conduct. The current increase is instantaneously limited with the help of the avalanche effect caused by the junction energy gap. This is known as the “avalanche breakdown” mechanism. As a result, the voltage at the DI2 (Diode Input 2) terminal tends to decrease and clamps down the incoming transient voltage.

Applications

The 3KP75CA is widely used in industrial and telecommunication equipment as a surge protector. Its fast response time and low clamping voltage make it ideal for protecting sensitive electronic components. It can be used as a power entry module, where it helps suppress voltage spikes caused by the switching of large power supplies. It can also be used in data communication equipment as a telecom protection module, hermetically sealed to prevent EMI/RFI noise interference.