VS-ST333S08PFL0

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Thyristors – SCRs

VS-ST333S08PFL0 is a silicon controlled rectifier (SCR). It is a three-terminal power semiconductor device, primarily used in industrial and domestic applications, such as circuit breakers, welding equipment, motor controls and power supplies.

SCRs are robust, long lasting and reliable power electronic switches, capable of carrying intermediate currents up to several hundred amperes.

Application Field

The applications for SCRs are varied and depend on the specific model of SCR. Some common applications for the VS-ST333S08PFL0 SCR include:

• used in heating systems
• used as a phase-controlled thyristor to help regulate electricity flowing from power plants to distribution networks
• used as a switch to control the speed of fans
• used in street lighting systems
• used to start fluorescent and energy saving lamps
• used in switching and charging circuits

The VS-ST333S08PFL0 SCR has a maximum repetitive peak reverse voltage (VRRM) of 333 V, a maximum repetitive off-state forward voltage (VFM) of 1.7V, a maximum gate trigger current (IGT) of 2mA and a maximum gate trigger voltage (VGT) of 1.2V.

Working Principle

The working principle of a SCR is based on the PNPN structure. It consists of three layers of P type and N type silicon. The PNPN structure possesses two PN junctions, one formed between an N-type and P-type layer and the other between two P-type layers.

The middle P-type layer is also called the “gate”. It is this portion of the SCR which acts as the switch. If a small current is applied to the gate, it changes the conductivity of the device and current can start flowing through the device. This is known as “triggering” the SCR.

Once the SCR is in the “ON” state, no current is necessary to maintain the conducting state. This is known as the “latching” state of the device. The only way of turning it off is to reduce the current through the device to zero. This is known as “commutation” or “turning off” the device.

The VS-ST333S08PFL0 SCR is a line-controlled device, which means that it is triggered by a voltage signal. A positive voltage, when applied to the gate of the SCR, causes it to “turn on”, thereby allowing current to flow. The current can be either constant or pulsed.

The current flow through the device is then regulated by adjusting the line voltage. The SCR can be “turned off” by reducing the gate voltage to zero.

The VS-ST333S08PFL0 SCR is ideal for applications which require reliable power control with low maintenance costs. It is used extensively in industrial and domestic applications and is capable of carrying intermediate currents up to several hundred amperes.

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