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. 395-3474
Mfr. Part No.VS-50RIA120
BrandVishay
PHP1,186.22
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. 165-2391
Mfr. Part No.VS-50RIA120
BrandVishay
PHP499.74
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. 169-5896
Mfr. Part No.16RIA40
BrandVishay
PHP282.07
Each (In a Bag of 100)
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16A SCR TO-48 400V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 395-2730
Mfr. Part No.VS-16RIA40
BrandVishay
PHP693.32
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16A SCR TO-48 400V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 169-6013
Mfr. Part No.VS-25TTS12PBF
BrandVishay
PHP100.64
Each (In a Tube of 50)
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16A SCR TO-220AB 1200V 350A Through Hole 45mA 2V 100mA 3 10.54mm 4.57mm 8.76mm 10.54 x 4.57 x 8.76mm
RS Stock No. 395-2724
Mfr. Part No.VS-16RIA100
BrandVishay
PHP514.60
Each
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16A SCR TO-48 1000V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 708-4446
Mfr. Part No.VS-40TPS16-M3
BrandVishay
PHP258.99
Each
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35A SCR TO-247AC 1600V 600A Through Hole 150mA 2.5V 150mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 145-1785
Mfr. Part No.VS-40TPS16-M3
BrandVishay
PHP213.292
Each (In a Tube of 25)
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35A SCR TO-247AC 1600V 600A Through Hole 150mA 2.5V 150mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 919-4404
Mfr. Part No.VS-40TPS12A-M3
BrandVishay
PHP187.053
Each (In a Tube of 25)
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35A SCR TO-247AC 1200V 600A Through Hole 40mA 2.5V 150mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 169-5894
Mfr. Part No.16RIA100
BrandVishay
PHP282.07
Each (In a Bag of 100)
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16A SCR TO-48 1000V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 301-619
Mfr. Part No.VS-40TPS12A-M3
BrandVishay
PHP327.59
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35A SCR TO-247AC 1200V 600A Through Hole 40mA 2.5V 150mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 169-5888
Mfr. Part No.180RKI80PBF
BrandVishay
PHP3,071.78
Each (In a Bag of 12)
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180A SCR TO-93 800V 4000A Thread Mount 150mA 2.5V 600mA 3 - - 234.5mm 35 (Dia.) x 234.5mm
RS Stock No. 165-2992
Mfr. Part No.VSKT91/16
BrandVishay
PHP2,903.30
Each (In a Box of 10)
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95A SCR TO-240AA 1600V 2094A Panel Mount 270mA 4V 250mA 7 92mm 22.6mm 30mm 92 x 22.6 x 30mm
RS Stock No. 165-2790
Mfr. Part No.VS-111RKI120PBF
BrandVishay
PHP2,130.117
Each (In a Bag of 25)
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110A PCT TO-94 1200V 2180A Thread Mount 120mA 2V 200mA 3 29.5mm 27mm 188mm 29.5 x 27 x 188mm
RS Stock No. 357-5103
Mfr. Part No.VS-180RKI80PBF
BrandVishay
PHP3,263.93
Each
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180A SCR TO-93 800V 4000A Thread Mount 150mA 2.5V 600mA 3 - - 234.5mm 35 (Dia.) x 234.5mm
RS Stock No. 919-4384
Mfr. Part No.VS-30TPS16-M3
BrandVishay
PHP86.479
Each (In a Tube of 25)
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20A SCR TO-247AC 1600V 300A Through Hole 45mA 2V 100mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 357-4324
Mfr. Part No.VS-80RIA80PBF
BrandVishay
PHP1,958.25
Each
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80A PCT TO-94 800V 1990A Thread Mount 120mA 2.5V 200mA 3 29.5mm 27mm 188mm 29.5 x 27 x 188mm
RS Stock No. 300-420
Mfr. Part No.VS-30TPS16PBF
BrandVishay
PHP105.46
Each
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20A SCR TO-247AC 1600V 300A Through Hole 45mA 2V 100mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 700-5119
Mfr. Part No.VS-VSKT91/16
BrandVishay
PHP2,114.46
Each
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95A SCR TO-240AA 1600V 2094A Panel Mount 270mA 4V 250mA 7 92mm 22.6mm 30mm 92 x 22.6 x 30mm
RS Stock No. 700-5566
Mfr. Part No.VS-111RKI120PBF
BrandVishay
PHP1,919.83
Each
units
110A PCT TO-94 1200V 2180A Thread Mount 120mA 2V 200mA 3 29.5mm 27mm 188mm 29.5 x 27 x 188mm