SMBJ90A-TP Circuit Protection

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The SMBJ90A-TP is a unidirectional, bidirectional, and common-mode Transient Voltage Suppressor (TVS) Diode. It is designed to protect sensitive electronics from transient voltage generated by electromagnetic interferences, lightning and induced electric fields. The SMBJ90A-TP has a low capacitance of 0.5pF, a fast response time of 1ns, and an impressive pulse power capability of 9,000 watts. With its low capacitance design, the device is very effective at protecting transient voltage events across a wide range of frequencies.

The SMBJ90A-TP has two main applications. The first is in power supply line protection, where its bidirectional transient suppression capabilities provide reliable protection from surges or ESD events. The second is in signal line protection, where its low capacitance design ensures high performance signal transmission and EMI protection. The wide range of breakover voltage for the SMBJ90A-TP (from 5.0V to 180V) makes it suitable for a broad range of applications with different levels of voltage transients.

The working principle of the SMBJ90A-TP is quite straightforward. The device works by clamping the voltage across it when the voltage exceeds a certain level, known as the clamping voltage (Vclamp). If the voltage across the device is less than the clamping voltage, the device will pass the current. However, if the voltage exceed the clamping voltage, the device will clamp the voltage and limit the current through it.

The SMBJ90A-TP also offers excellent protection against thermal runaway. Its positive temperature coefficient (PTC) ensures that the device will respond to any increase in current by increasing the clamping voltage, which automatically limits the current. This helps protect the device and its associated electronics from excessive current.

In conclusion, the SMBJ90A-TP is an effective, efficient, and reliable Transient Voltage Suppressor (TVS) Diode. Its low capacitance design, fast response time, and high power pulse capabilities make it suitable for a range of applications, especially those with a wide range of voltage transients. It is also good for power supply and signal line protection due to its bidirectional transient suppression, and its PTC behavior ensures better protection against thermal runaway.

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