SMBJ400A Circuit Protection

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TVS (transient voltage suppressor) diodes, also referred to as surge suppressors, provide an important protection to system components from voltage spikes, which can be caused by lightning, electrostatic discharge, power supply abnormalities, or other types of electrostatic disturbances. The SMBJ400A is a unidirectional, 400W (8/20μs) Transient Voltage Suppressor Diode, capable of withstanding up to 17.6A surge current and with a breakdown voltage ranging from 5.6V to 190V. The SMBJ family of TVS diodes are unidirectional, meaning they can only conduct in one direction. This is key in order to protect system components from being damaged by a high voltage. Let us now look into the applications and working principle of the SMBJ400A.

The SMBJ400A is typically used in applications such as cell phone base stations, AC/DC converters, LED lighting, and automotive electronics. These applications require reliable voltage protection while maintaining a low energy loss, and the SMBJ400A’s low capacitance, sturdy construction, and low power losses make it well-suited for these applications. The SMBJ400A can also be used in low voltage applications such as consumer electronics, communication systems, and computers, where it helps protect against power supply abnormalities, electrostatic discharge, and other types of voltage spikes.

Now let us explore the working principle of the SMBJ400A. As mentioned previously, it is a unidirectional device, meaning it only conducts in one direction. The SMBJ400A is designed to absorb any transient voltages above the breakdown voltage. When a transient voltage is applied, the device will start to conduct current and absorb the energy of the transient voltage. This allows the voltage to be suppressed without affecting the normal operation of the circuit. Once the transient voltage is absorbed, the device will return to its non-conducting state. This process occurs very quickly, allowing it to protect the system from voltage spikes and power supply abnormalities.

To sum up, the SMBJ400A is a unidirectional, 400W transient voltage suppressor diode developed for various applications such as cell phone base stations, AC/DC converters, LED lighting, automotive electronics, consumer electronics, communication systems, and computers. Its inherent ability to absorb transient voltages above its breakdown voltage and revert to its non-conducting state makes it an ideal solution for these applications. Thanks to its low capacitance, sturdy construction, and low power losses, the SMBJ400A is the go-to solution for reliable voltage protection.

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