SMDJ78 Circuit Protection

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The SMDJ78 is a small, surface mount TVS-diodes which offers superior thermal performance, reliability, and transient protection to a variety of electronic devices. This type of diode, sometimes referred to as a Zener Diode, works by momentarily removing any voltage spike on its input side, protecting its output side from any sudden voltage change.

The SMDJ78 is designed to protect against transient electrical disturbances, such as electrostatic discharge (ESD) or lightning, that may otherwise cause inventory damage or component failure. By providing a voltage breakdown between its signal lines, it acts as a shunt or short-circuit to the disturbance, thus providing a protective buffer from the threat. Its unique design provides an ultra-low capacitance, allowing it to have a high surge capacity but with very low parasitic impedance.

It is primarily used in automotive, industrial and consumer electronics applications, such as computers and laptops, as well as medical and military applications. The SMDJ78 is an ideal choice for applications that require superior transient protection, while still offering low on-resistance, low capacitance, and a low-profile. It is designed to be used in a variety of conditions and is rated for total power dissipation up to 1.5 Watts. It also has a maximum peak power rating of 8 Watts, ensuring robust protection against potential overvoltage events.

The SMDJ78 can also be used as a voltage regulator in order to keep the voltage on the output side of the diode within a certain range. It operates by adjusting the internal resistance, allowing it to regulate the output voltage from being too low or too high. The circuit is typically configured with a resistor divider to achieve the desired output voltage.Unfortunately, this type of diode does have a limited current handling capability; in order to maintain a safe operating temperature, the device must be derated depending on its application.

The SMDJ78 also features several safety features in order to protect itself from overloads. Its thermal limit circuit will shut the diode down in order to prevent its components from getting too hot, while its reverse-order protection will protect the diode from the event of an incorrect power-up sequence. Additionally, its short-circuit protection will keep the diode from blowing during an over-voltage event.

The SMDJ78 is designed to be a cost effective and efficient solution for many different electrical protection applications. It offers superior transient protection, low parasitic impedance, low on-resistance, and a variety of safety features, making it an ideal choice for many applications.

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