SM4T68AY

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The SM4T68AY TVS is a transient suppressing diode specifically designed to safeguard sensitive electronic devices against high voltage short duration surges. It features a power dissipation of 600 W and the highest peak pulse current capability of up to 30A and up to an 85 V clamping voltage. The SM4T68AY is employed in various consumer appliances, automotive, and telecom applications requiring surge protection.

Application Field

The SM4T68AY can be used in a wide range of applications due to its state-of-the-art protection features:

• Consumer electronics: laptops, tablets, desktop computers, monitors, printers, gaming consoles, and other.
• Automotive: car audio systems, navigation devices, central locking systems, xenon light control units, electric power steering and other.
• Communication: consumer and industrial telecommunication systems, local area networks, and other.

The SM4T68AY is used in industrial processes that require protection from electrical spikes, such as surge protection of building external utility lines, surge protection of special equipment in military electronics, and surge protection of special instrumentation in the oil and gas industry.

Working Principle

The SM4T68AY implements a monolithic multilayer avalanche diode with a positive temperature coefficient and a rated voltage series of 600W. Its primary role is to protect sensitive electronic components and other equipment against unexpected transients.

The SM4T68AY operates based on the series avalanche principle. In case of an incoming surge, the current flows through the avalanche diode until the current reaches the current limiting threshold and is limited by the current limiting loop. The avalanche diode then clamps the voltage to the rated DC clamping voltage, suppressing the transient. The avalanche diode also provides short circuit protection by limiting the sustained current flow.

The SM4T68AY also provides an additional level of protection by employing a fusible element that acts as a latch-off device in case the voltage protection fails to suppress the transient. In such case, the fusible element will open and disconnect the circuit from the external power supply, thus preventing further damages or damage propagation.

In summary, the SM4T68AY is a robust surge suppression device, providing reliable protection against transient voltage surges, and preventing damage and system failure.

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