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. 167-320
Mfr. Part No.VS-40TPS12-M3
BrandVishay
€7.83
Each
units
35A SCR TO-247AC 1200V 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. 145-2566
Mfr. Part No.VS-40TPS12-M3
BrandVishay
€6.122
Each (In a Tube of 25)
units
35A SCR TO-247AC 1200V 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. 395-3474
Mfr. Part No.VS-50RIA120
BrandVishay
€20.71
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
€8.328
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. 708-4222
Mfr. Part No.VS-16TTS08-M3
BrandVishay
€3.79
Each
units
10A SCR TO-220AC 800V 200A Through Hole 60mA 2V 100mA 3 10.54mm 4.57mm 8.76mm 10.54 x 4.57 x 8.76mm
RS Stock No. 918-9802
Mfr. Part No.VS-16TTS08-M3
BrandVishay
€2.942
Each (In a Tube of 50)
units
10A SCR TO-220AB 800V 200A Through Hole 90mA 3V 150mA 3 10.51mm 15.49mm 4.65mm 10.51 x 15.49 x 4.65mm
RS Stock No. 145-1785
Mfr. Part No.VS-40TPS16-M3
BrandVishay
€3.044
Each (In a Tube of 25)
units
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. 919-4375
Mfr. Part No.VS-30TPS12-M3
BrandVishay
€3.945
Each (In a Tube of 25)
units
20A SCR TO-247AC 1200V 300A Through Hole 45mA 2V 100mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 167-314
Mfr. Part No.VS-40TPS08-M3
BrandVishay
€7.32
Each
units
35A SCR TO-247AC 800V 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. 395-3496
Mfr. Part No.VS-50RIA40
BrandVishay
€17.61
Each
units
50A SCR TO-65 400V 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. 169-5920
Mfr. Part No.50RIA40
BrandVishay
€7.974
Each (In a Bag of 100)
units
50A SCR TO-65 400V 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. 300-414
Mfr. Part No.VS-30TPS12-M3
BrandVishay
€5.51
Each
units
20A SCR TO-247AC 1200V 300A Through Hole 45mA 2V 100mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 708-4446
Mfr. Part No.VS-40TPS16-M3
BrandVishay
€3.10
Each
units
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. 145-1745
Mfr. Part No.VS-40TPS08-M3
BrandVishay
€4.344
Each (In a Tube of 25)
units
35A SCR TO-247AC 800V 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. 165-6237
Mfr. Part No.VS-50RIA80
BrandVishay
€16.226
Each (In a Bag of 100)
units
80A SCR TO-65 800V 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. 817-2465
Mfr. Part No.VS-50RIA80
BrandVishay
€18.30
Each
units
80A SCR TO-65 800V 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. 169-5840
Mfr. Part No.ST180C12C0
BrandVishay
€59.85
Each (In a Box of 12)
units
350A PCT TO-200AB 1200V 5230A Screw Mount 150mA 3V 600mA 3 42mm 42mm 14.4mm 42 x 42 x 14.4mm
RS Stock No. 169-5956
Mfr. Part No.T70RIA120
BrandVishay
€16.14
Each (In a Box of 10)
units
70A SCR D 55 1200V 1740A Panel Mount 120mA 2.5V 200mA 3 41mm 27mm 25mm 41 x 27 x 25mm
RS Stock No. 169-5841
Mfr. Part No.ST180C16C0
BrandVishay
€42.525
Each (In a Box of 12)
units
350A PCT TO-200AB 1600V 5230A Screw Mount 150mA 3V 600mA 3 42mm 42mm 14.4mm 42 x 42 x 14.4mm
RS Stock No. 169-5957
Mfr. Part No.T90RIA60
BrandVishay
€18.11
Each (In a Box of 10)
units
90A SCR D 55 600V 1870A Panel Mount 120mA 2.5V 200mA 3 41mm 27mm 25mm 41 x 27 x 25mm