SMF20A-E3-18 Circuit Protection

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The SMF20A-E3-18 is a type of transient voltage suppression diode, designed and used to reduce overvoltage transients, which can be produced by a variety of sources like inductive loads, electrostatic discharge, and lightning. It is commonly used in high-voltage power supplies, high-speed control systems, communication systems and computation systems.

The maximum peak pulse power is 18.4W, allowing the circuit to withstand larger spike currents. It also has a high surge absorbance rate at 20 Amps corresponding to 1.5 Ohms. Its rapidly acting-and-seeking feature helps to decrease the peak pulse currents created by sudden energy changes to a safe level.

The SMF20A-E3-18 has a maximum reverse breakdown voltage of 18V, so it’s important to use protective fuses in circuits that have high current loading for safety. It also has a minimum clamping voltage of 26V, which is the voltage that will be seen by the circuit when the diode is triggered. It has a capacitance of 7.4pF, which helps in the protection of signals and control systems by preventing damage from high-frequency transients.

This SMF20A-E3-18 diode works by using the P–N junction to detect voltages that exceed its breakdown voltage. When this happens, current is allowed to pass through the device and is interconnected in parallel with the circuit and components. This relationship between the diode and the circuit is known as the Zener Clamp. While the diode is clamped, the voltage will remain constant and the system will remain operational during any overvoltage.

The SMF20A-E3-18 diode\'s ability to safely and quickly detect overvoltage transients allows it to be a great tool when it comes to protecting circuits and components. This application field is typically found in a variety of electrical and electronic systems, such as automotive, industrial, communications, computers, consumer electronics, and lighting applications.

In conclusion, the SMF20A-E3-18 is an exceptionally useful type of transient voltage suppression diode designed to reduce overvoltage transients. It has a high surge absorbance rate, with a maximum reverse breakdown voltage of 18V, and a minimum clamping voltage of 26V. The Zener Clamp ensures long-term operational stability in the presence of overvoltage transients, making this diode be used widely in a variety of applications.

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