SA40HE3/73

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The SA40HE3/73 are transient voltage suppressors (TVS) diodes used to limit the amount of voltage or current across an electrical device and protect it from damage caused by transients. This product provides excellent clamping protection across a wide variety of voltage and frequency combinations and the robust design protects the circuit from being damaged by instantaneous high-voltage transients.

This versatile device finds its applications in portable electronics, automotive, industrial and transportation applications. SA40HE3/73 provides high speed performance to protect sensitive components from damage due to power supply transients. With superior surge rejection and low operating voltage, these diodes have excellent temperature stability and reliability for a wide variety of electrical and commercial applications.

The SA40HE3/73 has a typical breakdown voltage of 18 V and a clamping voltage of 40 V. It is available in an SOD 123 package and can handle up to 50 watts of power. Breakdown current is typically 20 A peak and the surge peak current is 5 A. This device has a low parasitic capacitance of 0.1 pF and a low parasitic inductance of 0.5 ηH. It is ideal for a wide range of applications including industrial, automotive, and consumer applications.

The working principle of TVS (Transient Voltage Suppressor) diodes, such as SA40HE3/73, is basic. When the input voltage exceeds a certain threshold, the diode breaks down and it starts conducting current. The current is limited by the forward voltage of the diode and it is designed to limit the voltage across the protected device. The SA40HE3/73 is designed to handle up to 50 watts of power and its breakdown voltage is set at 18V.

The SA40HE3/73 contains a Zener diode and a P-channel FET. When the input voltage exceeds the breakdown voltage, the Zener diode conducts current and the resulting current flow turns on the P-channel FET which clamps the voltage to the breakdown voltage. When the input voltage drops below the breakdown voltage, the Zener diode turns off and the P-channel FET is also turned off, allowing the voltage to return to its pre-transient state.

In summary, the SA40HE3/73 is a one-of-a-kind device used to protect sensitive components from destructive power supply transients. With its low parasitic capacitance and low parasitic inductance, it is suitable for a wide range of applications. When the input voltage exceeds the breakdown voltage, the Zener diode becomes conductive and the P-channel FET clamps the voltage, thereby protecting the connected device from any damage.

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