SMBJ18A Circuit Protection

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The SMBJ18A is a diode that belongs to the Transient Voltage Suppressor (TVS) family of products. It is used to protect sensitive electronic circuits from electrical overstress (EOS) due to voltage transients such as electrostatic discharge (ESD) or lightning strikes. The SMBJ18A has the ability to rapidly clamp voltage transients and suppress any voltage that exceeds its breakdown voltage. This diode has a low dynamic impedance, making it capable of withstanding high-energy transients.

The SMBJ18A is available in two versions; the unidirectional and the bidirectional diode. The unidirectional diode is used to protect circuits from voltage transients going in one direction, whereas the bidirectional diode is used to protect from voltage transients going in both directions. It is also available in various voltage ratings, from 5.0 volts to 180 volts.

The SMBJ18A has a number of applications in different industries such as telecommunications, computer systems, automotive, consumer electronics, and industrial electronic control systems. Some of these applications include protecting printed circuit boards from ESD, protecting multiple-line bus systems from surges, and protecting voltage sensitive components during in-rush current situations.

The SMBJ18A operates by clamping the voltage when it exceeds its breakdown voltage, allowing the current to flow through the diode in one direction and limiting the voltage across the diode. The junction with the breakdown voltage of the SMBJ18A can be adjusted with the addition of a series resistance. This allows the user to set the dynamic resistance of the diode to the desired level.

The SMBJ18A is an effective protective device due to its low dynamic impedance, which allows it to quickly clamp high voltage transients and limit the voltage across it. These characteristics make it an ideal device for protection from ESD and other voltage transients. It is also capable of withstanding high repetitive peak power, making it suitable for high power applications such as automotive systems.

The SMBJ18A is a versatile diode that is suitable for a wide variety of applications that require protection from voltage transients. It is available in various voltage ratings and can be adjusted to have a low dynamic impedance. This makes it a cost effective way to provide reliable protection from ESD and other transient voltages.

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