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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Description Price 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 Length Width Height Dimensions
RS Stock No. 395-9258
Mfr. Part No.VS-ST180S12P1VPBF
BrandVishay
$115.07
Each
units
200A SCR TO-93 1200V 5230A Thread Mount 150mA 3V 600mA 3 35mm 30.33mm 49.5mm 35 x 30.33 x 49.5mm
RS Stock No. 165-2440
Mfr. Part No.VS-ST180S12P1VPBF
BrandVishay
$105.917
Each (In a Bag of 12)
units
200A SCR TO-93 1200V 5230A Thread Mount 150mA 3V 600mA 3 35mm 30.33mm 49.5mm 35 x 30.33 x 49.5mm
RS Stock No. 165-2391
Mfr. Part No.VS-50RIA120
BrandVishay
$12.49
Each (In a Bag of 100)
units
50A SCR TO-65 1200V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 395-3474
Mfr. Part No.VS-50RIA120
BrandVishay
$38.84
Each
units
50A SCR TO-65 1200V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 254-0544
Mfr. Part No.VS-25RIA120
BrandVishay
$38.79
Each
units
25A SCR TO-48 1200V 440A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 145-1945
Mfr. Part No.VS-25RIA120
BrandVishay
$6.496
Each (In a Bag of 100)
units
25A SCR TO-48 1200V 440A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 165-6021
Mfr. Part No.VS-2N5206
BrandVishay
$25.80
Each (In a Bag of 100)
units
22A SCR TO-208AA 1000V 340A Thread Mount 80mA 3V 200mA 2 - 14.3mm 41.7mm 15.5 x 14.3 x 41.7mm
RS Stock No. 817-2428
Mfr. Part No.VS-2N5206
BrandVishay
$19.45
Each
units
22A SCR TO-208AA 1000V 340A Thread Mount 80mA 3V 200mA 2 - 14.3mm 41.7mm 15.5 x 14.3 x 41.7mm
RS Stock No. 169-5961
Mfr. Part No.ST330S16P1PBF
BrandVishay
$409.873
Each (In a Bag of 6)
units
330A SCR TO-118 1600V 9420A Stud 200mA 3V 600mA 3 49mm 42.5mm 74.5mm 49 x 42.5 x 74.5mm
RS Stock No. 395-9315
Mfr. Part No.VS-ST330S16P1PBF
BrandVishay
$427.07
Each
units
330A SCR TO-118 1600V 9420A Stud 200mA 3V 600mA 3 49mm 42.5mm 74.5mm 49 x 42.5 x 74.5mm
RS Stock No. 145-1770
Mfr. Part No.VS-70TPS16PBF
BrandVishay
$8.533
Each (In a Tube of 25)
units
70A SCR Super-247 1600V 1400A Through Hole 100mA 1.5V 200mA 3 16.1mm - 20.8mm -
RS Stock No. 700-5594
Mfr. Part No.VS-70TPS16PBF
BrandVishay
$16.46
Each
units
70A SCR Super-247 1600V 1400A Through Hole 100mA 1.5V 200mA 3 16.1mm - 20.8mm -
RS Stock No. 817-2453
Mfr. Part No.VS-50RIA20
BrandVishay
$17.07
Each
units
80A SCR TO-65 200V 1490A Thread Mount 250mA 3.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 165-6236
Mfr. Part No.VS-50RIA100
BrandVishay
$29.51
Each (In a Bag of 100)
units
80A SCR TO-65 1000V 1490A Thread Mount 250mA 3.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 817-2459
Mfr. Part No.VS-50RIA100
BrandVishay
$22.36
Each
units
80A SCR TO-65 1000V 1490A Thread Mount 250mA 3.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 169-5899
Mfr. Part No.22RIA40
BrandVishay
$8.746
Each (In a Bag of 100)
units
22A SCR TO-48 400V 420A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 169-5960
Mfr. Part No.ST330S12P1PBF
BrandVishay
$193.477
Each (In a Bag of 6)
units
330A SCR TO-118 1200V 9420A Stud 200mA 3V 600mA 3 49mm 42.5mm 74.5mm 49 x 42.5 x 74.5mm
RS Stock No. 395-9309
Mfr. Part No.VS-ST330S12P1PBF
BrandVishay
$153.97
Each
units
330A SCR TO-118 1200V 9420A Stud 200mA 3V 600mA 3 49mm 42.5mm 74.5mm 49 x 42.5 x 74.5mm
RS Stock No. 395-2831
Mfr. Part No.VS-22RIA40
BrandVishay
$21.67
Each
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22A SCR TO-48 400V 420A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 903-3507
Mfr. Part No.VS-VSKT500-16PbF
BrandVishay
$754.23
Each
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500A SCR MAGN-A-PAK 1600V 18.7kA Panel Mount 3A 20V 500mA 3 150mm 60mm 52mm 150 x 60 x 52mm