Thyristors

What is a Thyristor?
A Thyristor is a four layer semiconductor device, also known as a silicon controlled rectifier (SCR) It is like a fast static switch and is good for controlling large amounts of power, they can also control the speed of DC motors.
A Thyristor usually consists of three electrodes: an anode (positive terminal), Cathode (negative terminal) and a gate. (You can also get thyristors with two or four leads). The gate is the main control terminal while the main current flows between the anode and cathode
The Thyristor is made of N type and P type materials. The N-type material is formed by doping an element with electrons to increase the number of negative charge-carrying electrons. The P-type material is also produced through doping, although the resulting charge-carrying electrons are positively charged. By alternating layers of P and N-type material, a semiconductor thyristor device is formed.
Thyristors are used to create a latching circuit. Thyristors can be turned on using the gate. It then turns off when the voltage across the anode-cathode drops back down to zero.
Types of Thyristor:
Silicon controlled rectifier (SCR) -The basic purpose of a SCR is to function as a switch that can turn on or off small or large amounts of power.
Silicon controlled switch (SCS) - Silicon Controlled Switch (SCS) is a device similar to a SCR, but it is designed to turn off when a positive voltage/input current pulse is applied to an additional "Anode gate"
Triac – Triac gets its name from Triode for alternating current Triacs are similar to SCRs but it conducts in both directions, (a bidirectional device). This means that it can switch AC and DC currents.
Four layer diode - A four layer diode has 2 pins and is similar to a voltage-sensitive switch. When the voltage between the two pins exceeds the breakdown voltage it turns ON, otherwise it’s OFF.
Diac- Diac is a mix of the words diode and ac switch it is similar to four-layer diode but it can conduct in both directions meaning it can contact both AC and DC currents.
Thyristors are used in applications such as motor speed controls, pressure control systems, light dimmers and liquid level regulators
What are Phase controlled Thyristors?
Thyristors are frequently used as phase-controlled current valves for AC to DC conversion and vice versa, operating at low frequencies In the conducting state, thyristors feature very low losses, making them ideal devices to efficiently control very high currents and energies.

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Beskrivning Pris Rated Average On-State Current Thyristor Type Package Type Repetitive Peak Reverse Voltage Surge Current Rating Mounting Type Maximum Gate Trigger Current Maximum Gate Trigger Voltage Maximum Holding Current Pin Count Dimensions Diameter Maximum Operating Temperature Minimum Operating Temperature
RS-artikelnummer 169-5920
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50A SCR TO-65 400V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2 x 17.35 x 42.5mm - +125 °C -40 °C
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50A SCR TO-65 400V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2 x 17.35 x 42.5mm - +125 °C -40 °C
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Tillv. art.nrX0403MF 1AA2
VarumärkeSTMicroelectronics
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4A SCR TO-202 600V 33A Through Hole - 0.8V 5mA 3 10.1 x 4.5 x 7.3mm - +125 °C -40 °C
RS-artikelnummer 165-7641
Tillv. art.nrX0402MF 1AA2
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0.9A SCR TO-202 600V 33A Through Hole 0.2mA 0.8V 5mA 3 10.1 x 4.5 x 7.3mm - +125 °C -40 °C
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Tillv. art.nrBT148W-600R,115
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0.6A SCR SOT-223 (SC-73) 600V 11A Surface Mount 0.2mA 1.5V 6mA 4 6.7 x 3.7 x 1.7mm - +125 °C -40 °C
RS-artikelnummer 484-5582
Tillv. art.nrBT148W-600R,115
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0.6A SCR SOT-223 (SC-73) 600V 11A Surface Mount 0.2mA 1.5V 6mA 4 6.7 x 3.7 x 1.7mm - +125 °C -40 °C
RS-artikelnummer 760-9288
Tillv. art.nrDCR370T18
VarumärkeDynex
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370A SCR Type G 1800V 5000A Stud 300mA 3V 200mA 3 42 (Dia.) x 13.5mm - +125 °C -
RS-artikelnummer 145-9467
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4A SCR TO-202 600V 33A Through Hole - 0.8V 5mA 3 10.1 x 4.5 x 7.3mm - +125 °C -40 °C
RS-artikelnummer 103-7543
Tillv. art.nrBT151-800R,127
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7.5A SCR TO-220AB 800V 132A Through Hole 15mA 1.5V 20mA 3 10.3 x 4.7 x 9.4mm - +125 °C -40 °C
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35A SCR TO-218AC 800V 500A Through Hole - 1.5V 50mA 3 16 x 4.78 x 21.21mm - +125 °C -40 °C
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0.9A SCR TO-202 600V 33A Through Hole 0.2mA 0.8V 5mA 3 10.1 x 4.5 x 7.3mm - +125 °C -40 °C
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Tillv. art.nrVS-16RIA120
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16A SCR TO-48 1200V 360A Thread Mount 60mA 2V 130mA 2 - - +125 °C -65 °C
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Tillv. art.nrCS45-16IO1
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48A SCR TO-247AD 1600V 560A Through Hole 100mA 1.5V 100mA 3 - - +140 °C -40 °C
RS-artikelnummer 146-1718
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960A SCR Type G 1800V 14000A Stud 300mA 3V 200mA 3 58 (Dia.) x 26.5mm - +125 °C -
RS-artikelnummer 165-9922
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40A SCR TO-220AB 400V 520A Through Hole 40000µA 1.5V 60mA 3 10.67 x 4.78 x 15.75mm - +125 °C -40 °C
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10A SCR TO-220AC 800V 200A Through Hole 60mA 2V 100mA 3 10.54 x 4.57 x 8.76mm - +125 °C -40 °C
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2.55A SCR TO-225AA 600V 20A Through Hole 500µA 1V 6mA 3 7.74 x 2.66 x 11.04mm - +110 °C -40 °C
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50A SCR TO-65 1200V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2 x 17.35 x 42.5mm - +125 °C -40 °C
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350A PCT TO-200AB 1600V 5230A Screw Mount 150mA 3V 600mA 3 42 x 42 x 14.4mm - +125 °C -40 °C
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