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Thyristors - SCRs

T72H083544DN is a type of semiconductor device which belongs to the family of thyristors, which are sometimes referred to as Silicon Controlled Rectifiers (SCRs). It is composed of four layers of alternate N-type and P-type material, separated by junction layers or regions, and are designed to control low-level AC or DC electrical power stages. The letters "DN" at the end of the name signifies a fast turn-off time, making it suitable for use in high-frequency switching applications. The T series of SCRs are manufactured by NXP Semiconductors, and have a maximum Continuous Forward Current (I?F) rating of 8A, with a Repetitive Peak Voltange (VRRM) rating of 400V.

A key feature of SCRs is the ability to switch large amounts of electrical power, and is widely used in industrial applications such as welding, heating and lighting control. Because of the large amounts of power they can handle, SCRs are often used in switching applications, or in motor control. In motor control, they can be used to switch large AC or DC current, allowing motors to be started and stopped using a small signal.

Application Field

The T72H083544DN SCR is suited to switching applications and motor control, as well as in general power control. It is suitable for use in residential and industrial lighting, motor control, and heating applications, as well as general switching. It can be used in AC or DC circuits, and has a fast turn-off time making it suitable for high-frequency switching. It also has a maximum continuous forward current rating of 8A, with a repetitive peak voltage rating of 400V.

Working Principle

SCRs are part of the thyristors family, which is based on the four-layer structure of the semiconductor device. It is comprised of two N-type and two P-type layers, separated by the P-N junction layers within the device. SCRs are normally non-conductive until the gate receives a positive current flow, at which point it enables electrical conduction between the anode and cathode. Once the current through the device exceeds the gate-trigger current, the SCR switches on until the current drops back below the trigger level. As soon as this happens, the SCR switches back off and the current is cut off. This process can be repeated as many times as necessary, making the SCR ideal for switching applications.

The T72H083544DN is designed to switch high AC and DC current load, in particular inductive or capacitive loads. It features a fast turn-off time and has a maximum forward current rating of 8A with a repetitive peak voltage of 400V, making it suitable for a wide range of industrial and residential applications.

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