P1800SBLRP Circuit Protection

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Thyristors are a type of electronic semiconductor devices. Thyristors are often used in the field of power electronics, such as TVS - Transient Voltage Suppressors (TVS). A P1800SBLRP TVS Transient Voltage Suppression Diode is one kind of TVS used for protecting against transient overvoltages in pulse applications.

The TVS devices contain two or more diodes connected back-to-back with a central SCR (Thyristor), which has two terminals. The anode and cathode are connected to the two main terminals of the SCR, while the gate terminal is connected to one of the two external diodes. When a voltage across the SCR’s terminals exceeds its notch voltage, the SCR switches on and conducts current. The diodes protect against transient voltage surges or over-voltages due to their fast switching speeds.

The P1800SBLRP is a special type of junction-isolated transient voltage suppressor (TVS). It\'s made of silicon semiconductor material and has four layers— the anode, gate, junction and cathode. The P1800SBLRP operates as a 1500 W rated transient voltage suppression device for line-to-ground, ground-to-line and line-to-line transient suppression.

The P1800SBLRP is designed with an avalanche breakdown voltage of 1500V (as the working voltage) with a breakdown angle from 75 to 900 degrees. An avalanche breakdown can be generated when a reverse bias voltage is applied between anode and cathode of the diode, making the diode act like a short circuit at this point. The surge current passes through the device up to a maximum peak current of 650A, which safely limits the surge’s amplitude. The TVS is able to survive repetitive surges of up to 8kV.

The main working principle of the P1800SBLRP TVS device is controlled avalanche behavior. This avalanche behavior is referred to as \'clamping\'. The device\'s Avalanche Breakdown Voltage (ABV) is determined by the applied DC voltage. When a transient voltage exceeds the device\'s ABV, the current will be limited to the TVS’s rated forward current. This reduces the magnitude of the transient voltage, thus if a transient voltage remains present, the current will continue to flow until the transient voltage is eliminated.

In conclusion, the P1800SBLRP TVS Transient Voltage Suppression Diode is a specialized type of TVS that can be used to protect against transient overvoltages in pulse applications. Its working principle is based on controlled avalanche behavior, allowing it to withstand surges of up to 8kV and allowing the current to pass through the device up to a maximum peak current of 650A.

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