SMBJ20 Circuit Protection

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SMBJ20 is a popular type of transient voltage suppressor (TVS) diode. It typically has two terminals, an anode and a cathode, which are connected to a voltage source. The aim of the device is to protect sensitive electronics from damaging voltage spikes, such as those caused by transient overvoltages or electrostatic discharge (ESD).

The SMBJ20 is a single-line TVS diode, meaning it can only protect one wire or line. It is suitable for a wide range of applications, including data lines, personal computers and other electrical and electronic devices that may be vulnerable to transient overvoltage and ESD. It has a working breakdown voltage of 20 volts and can handle a peak pulse current (IPPM) of 400 Amps.

The working principle of the SMBJ20 is simple. When the device is exposed to an overvoltage, or a short-duration high-voltage pulse such as during an ESD event, it conducts current, providing a low impedance path between the anode and the cathode. This limits the voltage across the device and thus protects the equipment connected to it.

The SMBJ20 also has a low leakage current, which means it limits the current even during normal operation. This helps to reduce power loss, as well as potential noise or interference that could otherwise be caused by high leakage currents.

The SMBJ20 is an effective, reliable, and cost-effective solution for protecting a variety of equipment from transient voltages. It can be used in a wide range of applications, from personal computers and data lines to industrial or consumer electronics. It is one of the most popular TVS diodes on the market today.

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