SMDA24C-8E3/TR7

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The SMDA24C-8E3/TR7 is a surface-mount diode array from the Transient Voltage Suppressors (TVS) family. TVS diodes provide rugged protection from overvoltage transients, which is essential for components that may incur unwanted voltage spikes. These spikes can have devastating effects, ranging from premature circuit failure to catastrophic system malfunction, and is why TVS diodes are so important.

The SMDA24C-8E3/TR7 diode array is designed to take voltages up to 8kV with a maximum peak pulse current of 24A. It is designed for bidirectional or unidirectional pulse currents ranging from 100mA to 40A. It is constructed from pre-treated aluminum oxide discs, with an epoxy encapsulation for extra protection. Furthermore, the construction also guarantees fast response time, making it ideal for lightning, inductive, and electrostatic discharge (ESD) applications.

In terms of application field, it can be used for protection of low-voltage data lines such as RS-232 and USB. It is suitable for lightning-induced voltage surge protection, inductive load switching, positive temperature coefficient (PTC) application, and other general protection applications as well. This makes it a highly versatile device that can fulfill multiple protection needs depending on the application.

To better understand its working principle, we must look at the construction of the device itself. It is comprised of an alloy junction sandwiched between two p-type and n-type layers of aluminium oxide. This is then followed by an epoxy sealant. When overvoltage transients occur, the alloy junction acts as a switch, quickly pulling the voltage onto the diode array, which in turn releases a pulse current to the supply. The resistance of the epoxy seal increases with temperature, which is why the SMDA24C-8E3/TR7 is considered a PTC array.

Finally, the device contains a variety of safety measures to ensure that the circuit does not sustain any permanent damage from overvoltage transients. Firstly, the pd junction capacitance will start to decay rapidly once the voltage source is removed or reduced. This helps to drain any excess energy present in the system. Secondly, the built-in thermal resistance helps to dissipate any heat buildup due to overloading. Finally, the ceramic coating also provides additional protection against heat and stress from high voltage surges.

In summary, the SMDA24C-8E3/TR7 is a highly reliable diode array from the TVS family, designed for protection against overvoltage transients. It can handle voltages up to 8kV and a maximum peak pulse current of 24A, making it ideal for lightning and ESD applications. The device is constructed from pre-treated aluminum oxide discs, an alloy junction, and an epoxy sealant. It also provides built-in safety measures to protect the circuit from overvoltage transients.

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