SMBJ20ATR

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Transient Voltage Suppressors (TVS) have been used for many years to protect sensitive electronic components from dangerous and damaging electrical events. TVS devices, also known as Transient Voltage Suppressors Diodes (TVSDs), are specifically designed to detect and control the unfavorable voltage spikes that can occur in power grids, data lines, and other circuits. A particular type of TVSD used in many applications is the SMBJ20ATR.

The SMBJ20ATR TVSD is a commonly used device for suppressing over-voltage transients in power supplies and data lines. It is a unidirectional, low-capacitance transient voltage suppression diode designed to protect circuit components and system equipment from damaging voltage spikes. The SMBJ20ATR can handle high surge currents up to 24 A (fraction of a second) and can protect sensitive circuitry in lightning and induced transients up to 1500 W.

The SMBJ20ATR TVSD has a small form factor and works in a wide temperature range from -55°C to 175°C. It can also withstand a wide range of peak surge currents up to 150 A, making it suitable for use in a range of automotive, industrial, and consumer electronics applications. The device’s failure rate is minimally impacted by temperature variation and external mechanical stresses, making it a reliable choice for many applications.

The SMBJ20ATR is designed with an active junction combination that functions as a voltage-dependent switch to control the flow of current during a transient surge. The device works on the principle of avalanche breakdown, a mechanism of current control in which the voltage across the device is increased beyond a specified limit, causing a rapid avalanche of electrons that reduce the voltage back to a safe level.

This phenomenon is also known as the Zener effect, named after the physicist that discovered it. In a TVSD diode arrangement, the avalanche breakdown voltage varies inversely to the magnitude of the voltage pulse. The larger the current, the higher the voltage delivered to the device and the faster the breakdown of the junction. When the voltage peaks, the diode clamps the overall voltage to a safe level, preventing it from exceeding the maximum specified operating voltage.

The SMBJ20ATR is a highly efficient and reliable protection device that can provide superior electrical isolation for a wide variety of electronic components. Its fast switching times and reliable suppression of over-voltage transients make it a popular choice for many applications, ranging from consumer electronics to medical devices and automotive systems. The device can be used in stand-alone applications or in combination with other frequency conversion and protection components to make a complete, functional power system.

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