SMBJ51CA-Q

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The SMBJ51CA-Q is a transient voltage suppression (TVS) diode used for protecting sensitive electronics from voltage transients caused by electrostatic discharge (ESD), inductive loading, and electrical fast transients (EFT). This diode is widely used in automotive, industrial, consumer, and telecom applications where reliable protection from voltage transients is imperative for the safe operation of electronic components.

The SMBJ51CA-Q is a single-line bi-directional device, meaning it works the same regardless of the direction of current passing through it. This “U” shaped silicon diode uses an integrated clamping structure to provide a fast response time and superior peak pulse power capability. It features a unidirectional breakdown voltage of 5.0V (VBR), an off-state clamping voltage of 7.1V (VC) a maximum pulse current of 50A (IPP) and an energy rating of 417pF. The device is also RoHS compliant and has a maximum operating temperature of 125 Celsius.

The SMBJ51CA-Q is ideal for protecting against overvoltage transients in automotive, consumer, and industrial applications. It is often used to protect boards and components from voltage spikes that may occur due to ESD, load switching, and EFT. Due to its small size and dual bi-directional voltage operation, the SMBJ51CA-Q is often used in space critical applications like handheld electronic devices. It is also designed to meet very stringent ESD requirements set by international standards such as the IEC 61000-4-2 and IEC 61000-4-4.

The working principle of the SMBJ51CA-Q is that it allows current to flow through it in either direction until the voltage reaches a level where it will start to conduct the current. This occurs when the forward voltage exceeds the device’s breakdown voltage (VBR) of 5.0V. At this point, the current will start to flow through the device and induce the clamping voltage (VC), which is 7.1V. This helps to limit the voltage across the device and protect it from overvoltage transients. Once the transient has passed, the device will reset and return to its off-state configuration.

The integrated clamping structure of the SMBJ51CA-Q makes it a superior solution for protecting against ESD, EFT, and other transient-induced overvoltages. It is a very reliable device that is trusted by many major manufacturers in a variety of applications. It is highly recommended for use in any application that requires reliable protection from voltage transients.

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