SA18AHE3/73 Circuit Protection

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TVS diodes are used for protecting sensitive electronic components such as integrated circuits, transistors and printed circuit boards from destructive power spikes. The SA18AHE3/73 is a Transient Voltage Suppression (TVS) diode, designed for the toughest lightning, AC Arc Fault, and HEMP transient protection applications. This device is a silicon-based, low capacitance, symmetrically dioded, unidirectional transient voltage suppression diode.

Features and Benefits

• Low capacitance for improved data signal integrity
• Low on-resistance and diode forward voltage drop for energy efficiency
• High power density for small form factor designs
• Patented packaging for improved reliability
• High surge capability for higher peak pulse current
• High arc fault protection
• Robust HEMP protection

Application Field

The SA18AHE3/73 is a robust device that provides excellent protection for highly sensitive electronics such as computers, televisions, and other home appliances against both AC Arc Fault events and HEMP induced surges. The device has a low capacitance for improved data signal integrity and low on-resistance and diode forward voltage drop for increased energy efficiency. It is also well suited for lightning protection applications such as automobile and industrial systems that may be subject to high power surge events.

Working Principle

The SA18AHE3/73 works by clamping the voltage to a safe level when it is subjected to an overvoltage event. It is an unidirectional, symmetrically dioded TVS diode with a patented design that provides a low capacitance and a short parasitic inductance spike to ensure effective protection. When the TVS diode is triggered, the capacitance is quickly discharged to the ground, clamping the line voltage and protecting the downstream circuitry from damage.

During conditions of normal, low-level signals, the device remains in an off state. Upon exposure to a surge event such as an AC Arc Fault or a HEMP surge, the diode rapidly clamps the voltage and absorbs the maximum power overload. The low capacitance of the device ensures that induced voltages on the line are kept below the damage threshold of the sensitive IC’s. The device is able to absorb repeated surge events while still providing effective protection.

Conclusion

The SA18AHE3/73 is a robust and reliable device that is well suited for protecting sensitive electronic components from destructive power spikes. It is designed for the toughest lightning, AC Arc Fault, and HEMP transient protection applications and its low capacitance and diode forward voltage drop ensures high power density in small form factor designs. The device is able to absorb repeated transient surge events while still providing effective protection.

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