SMBJ28

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TVS (Transient Voltage Suppressors)--diodes are an important part of protecting electronic equipment from transient overvoltages, which can occur from a variety of causes such as lightning, switching of inductive loads, or transients on the power line from other equipment. The SMBJ28 is a bi-directional surface mount TVS diode with an efficient metal-oxide construction which provides protection from overvoltages for both power and data intermittent applications.

Using low clamping voltage, this device is specifically designed to protect sensitive microprocessor components from voltage transients, which are generated either by inductive load switching or by electro-static discharge. The SMBJ28 diode\'s bidirectional capability also makes it suitable for use in AC power line applications.

In general, the working principle of the SMBJ28 TVS diode is that of an ideal diode, with the diode forward-biased by the applied voltage. When a highly transient voltage spike causes the applied voltage to surpass the device\'s rated clamping voltage, the p-n junction begins to conduct, limiting the voltage from further rising.

In this state, reverse current is also confined, thereby sustaining the voltage spike until it subsides. This process does not damage the device, as when the voltage falls below the diode\'s rated clamping voltage, the p-n junction returns to its non-conductive state, allowing for normal forward current to traverse the diode.

The SMBJ28 is suitable for a variety of applications, primarily those which require electrical overvoltage protection from destructive voltage transients. These applications include power supplies, motor controllers, and communications networks.

Because the device is bidirectional, it is capable of protecting a much wider range of AC power line application than single-directional devices, including both inductive load switching and electro-static discharge related transients.

The SMBJ28 TVS diode also offers protection from high levels of reverse leakage current, meaning that the device is capable of limiting voltage transients without large currents of reverse leakage. This is especially beneficial for communications networks, as the simultaneous flow of reverse leakage and transient currents could potentially damage sensitive microprocessor components.

In summary, the SMBJ28 TVS diode is an effective and reliable form of overvoltage protection, allowing for the safeguard of sensitive electronic components from transient surges. Due to its low clamping voltage, bidirectional capability, and ability to limit reverse leakage current, the SMBJ28 is a suitable choice for a variety of AC power line and communications applications.

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