SMDJ120A Circuit Protection

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TVS (Transient Voltage Suppressors) diodes are used to protect electrical circuits from damaging voltage spikes. The SMDJ120A is a common TVS diode used in a wide variety of applications.

In its simplest form, a TVS diode is a device that rapidly responds to large power spikes and absorbs the excess energy. This is accomplished by having an avalanche breakdown voltage that is greater than the supply voltage. When the voltage exceeds this threshold, the diode will rapidly switch from an active or “on” state to an inactive or “off” state. This keeps the supply voltage at a safe operating level.

The SMDJ120A is an ultra-low capacitance, low stand-off voltage TVS diode. It is designed to offer superior ESD (Electrostatic Discharge) and EFT (Electrical Fast Transient) protection. The SMDJ120A is designed to be placed in-line in an electrical circuit to protect devices from damaging voltage spikes and other transient events. The SMDJ120A has a peak pulse power rating of 780 W (10/1000 μs, 8/20 μs) and a peak pulse current of 60 A. It has an SMD type package with an ultra-low capacitance of 0.58 pF and a low stand-off voltage of 6 V.

The Working Principle behind the SMDJ120A TVS diode is based on the avalanche effect.The avalanche effect occurs when a potential difference is applied across a PN junction of the diode. Under normal voltage, the electric field within the diode is not strong enough to cause a breakdown of the depletion region. However, when high enough voltages are applied, the electric field becomes much stronger than before and breaks down the depletion region.

This breakdown in the depletion region causes a large surge of free electrons and causes an avalanche breakdown. This sudden surge of current causes the voltage to drop quickly, thus providing protection from the overvoltage event. The SMDJ120A takes advantage of this effect byutilizing a special avalanche diode with low capacitance and low breakdown voltage.

The SMDJ120A TVS diode can be used in a variety of applications. These include automotive, audio, communication, computers, consumer electronics, and industrial electronics. It is typically used in line with electrical circuits in order to protect them from damaging voltage spikes and other transient events. It can also be used for overvoltage protection, ESD protection, and even in the design of EMI (Electromagnetic Interference) filters.

The SMDJ120A TVS diode is a common component used in a variety of applications requiring superior ESD and EFT protection. It utilizes the avalanche effect to quickly respond to voltage spikes and absorb the excess energy. The SMDJ120A is an ultra-low capacitance, low stand-off voltage design that is easy to implement in line with an electrical circuit to provide the necessary protection.

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