SA14AHE3/73 Circuit Protection

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Transil diodes – often referred to as TVS (Transient Voltage Suppressor) diodes – are an essential component in most electronic circuits. The SA14AHE3/73 is a type of Transil diode used in many consumer and industrial applications. In this article, we will discuss the application field and look to understand how it works.

The most common application for Transil diodes is protecting against voltage transients that can cause damage to electric circuits. They can be used to provide protection from electrostatic discharges (ESDs), inductive loads, and other voltage transients with peak amplitudes of up to 93V. In addition to protecting sensitive electronic components, they are also commonly used for noise suppression and electrical overstress (EOS) protection.

The SA14AHE3/73 Transil diode is in a SOT-323 package and has integrated suppression of ESD pulses. It is often used in consumer, industrial, and automotive applications, and is suitable for DC and AC circuits. It is designed to protect sensitive components, such as microcontrollers, FPGAs, and ASICs, from damage caused by ESD, excessive current surges, voltage transients, and other overvoltage situations.

The SA14AHE3/73 is composed of two junction diodes connected in series, with each diode connected to its own cathode. The two diodes are called a common cathode, and the following circuit symbol is often used to represent a Transil diode:

The Transil diode is a voltage-activated device which can be connected directly to one or more AC or DC components without the need for additional protective components. When the diode is subject to an excessive overvoltage, the parasitic capacitance of the diode slows down the voltage rise, which protects the connected components from the transient high voltage. This provides effective ESD, EOS, and noise protection. When the overvoltage situation is over, the device resets and begins to monitor the voltage again.

In conclusion, Transil diodes are an essential component used to protect sensitive electronic components against ESD, EOS, and other overvoltage situations. The SA14AHE3/73 is a common type of Transil diode that is widely used in consumer, industrial, and automotive applications. It is composed of two junction diodes connected in series, allowing it to effectively monitor and suppress high voltage transients.

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