SMBJ9.0

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SMBJ9.0 is a kind of unidirectional transient voltage suppressor (TVS) diode. It offers a variety of protective functions for applications over a wide voltage range, from 9.0V to 440V. It is suitable for any application needing to protect vulnerable circuits against excessive voltage surges.

The SMBJ9.0 diode features a low voltage drop for a fast response time, and it has two primary characteristics – its peak response current, and its breakover voltage. The peak response current is how much current the diode can absorb before going into clamping mode. The breakover voltage is the level required before the diode begins to conduct. SMBJ9.0 TVS diode has a peak stand-off voltage of 9 V DC and a maximum peak pulse current of 1.5 A.

In general, the SMBJ9.0 TVS diode is used to protect against voltage transients caused by events such as ESD, EFT, and lightning strikes. It provides overvoltage protection on power distribution lines, sensitive analog and digital circuits, and telecommunications lines. It also offers protection against other types of surge voltages, including inductive kick-back and capacitive switching, and it has an extremely low reverse leakage current.

The working principle of an SMBJ9.0 TVS diode is based on the PN junction. When the voltage across the diode is greater than the peak stand-off voltage, then it gets triggered. Then the diode begins to rapidly conduct, clamping the voltage surge and protecting the connected circuit. The diode continues to conduct until the voltage reduces to the peak breakdown voltage, as shown in the figure below.

In summary, SMBJ9.0 TVS diodes are highly effective for protecting electronics from excessive voltage transients. They have low clamping voltages and fast response times, which make them ideal for a wide variety of applications. They also have very small forward voltage drops, and their low reverse leakage current ensures that they are not affected by the input voltage.

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