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. 905-6178
Mfr. Part No.SKT 1200/16 E
BrandSemikron
SGD301.56
Each
units
840A SCR B 14 1600V 30000A Panel Mount 250 (Min)mA 3 (Min)V 500mA 3 - - 26mm 74 (Dia.) x 26mm
RS Stock No. 168-7882
Mfr. Part No.BTW69-600RG
SGD7.912
Each (In a Tube of 30)
units
- SCR TOP3 - - Through Hole - - - 3 15.5mm 4.6mm 21.1mm 15.5 x 4.6 x 21.1mm
RS Stock No. 810-7392
Mfr. Part No.BTW69-600RG
SGD8.15
Each
units
- SCR TOP3 - - Through Hole - - - 3 15.5mm 4.6mm 21.1mm 15.5 x 4.6 x 21.1mm
RS Stock No. 165-6020
Mfr. Part No.VS-25RIA80
BrandVishay
SGD19.07
Each (In a Bag of 100)
units
25A SCR TO-208AA 800V 440A Thread Mount 90mA 3V 130mA 2 - 14.3mm 41.7mm 15.5 x 14.3 x 41.7mm
RS Stock No. 171-0139
Mfr. Part No.MCR8SDG
BrandLittelfuse
SGD0.789
Each (In a Tube of 50)
units
8A SCR TO-220AB 400V 80A Through Hole 200µA 1.5V 6mA 3 10.28mm 4.82mm 15.75mm 10.28 x 4.82 x 15.75mm
RS Stock No. 817-2406
Mfr. Part No.VS-25RIA80
BrandVishay
SGD17.10
Each
units
25A SCR TO-208AA 800V 440A Thread Mount 90mA 3V 130mA 2 - 14.3mm 41.7mm 15.5 x 14.3 x 41.7mm
RS Stock No. 808-3996
Mfr. Part No.MCR8SDG
BrandLittelfuse
SGD0.92
Each (In a Pack of 20)
units
8A SCR TO-220AB 400V 80A Through Hole 200µA 1.5V 6mA 3 10.28mm 4.82mm 15.75mm 10.28 x 4.82 x 15.75mm
RS Stock No. 177-5203
Mfr. Part No.C106DG
BrandLittelfuse
SGD0.454
Each (In a Box of 500)
units
2.55A SCR TO-225AA 400V 20A Through Hole 500µA 1V 6mA 3 7.74mm 2.66mm 11.04mm 7.74 x 2.66 x 11.04mm
RS Stock No. 774-3467
Mfr. Part No.C106DG
BrandLittelfuse
SGD0.741
Each (In a Pack of 10)
units
2.55A SCR TO-225AA 400V 20A Through Hole 500µA 1V 6mA 3 7.74mm 2.66mm 11.04mm 7.74 x 2.66 x 11.04mm
RS Stock No. 168-8046
Mfr. Part No.TXN625RG
SGD2.782
Each (In a Tube of 50)
units
16A SCR TO-220AB 600V 314A Through Hole 40mA 1.3V 50mA 3 10.4mm 4.6mm 15.9mm 10.4 x 4.6 x 15.9mm
RS Stock No. 146-1718
Mfr. Part No.DCR960G18
BrandDynex
SGD173.226
Each (In a Box of 7)
units
960A SCR Type G 1800V 14000A Stud 300mA 3V 200mA 3 - - 26.5mm 58 (Dia.) x 26.5mm
RS Stock No. 829-0469
Mfr. Part No.TXN625RG
SGD4.084
Each (In a Pack of 5)
units
16A SCR TO-220AB 600V 314A Through Hole 40mA 1.3V 50mA 3 10.4mm 4.6mm 15.9mm 10.4 x 4.6 x 15.9mm
RS Stock No. 772-5478
Mfr. Part No.CR02AM-8-B#F00
SGD0.487
Each (In a Pack of 15)
units
0.3A SCR TO-92 400V 10A Through Hole 100µA 0.8V 3mA 3 5mm 3.9mm 5mm 5 x 3.9 x 5mm
RS Stock No. 760-9294
Mfr. Part No.DCR960G18
BrandDynex
SGD179.94
Each
units
960A SCR Type G 1800V 14000A Stud 300mA 3V 200mA 3 - - 26.5mm 58 (Dia.) x 26.5mm
RS Stock No. 355-2841
Mfr. Part No.TS820-600T
SGD1.59
Each
units
5A SCR TO-220AB 600V 73A Through Hole 0.2mA 0.8V 5mA 3 10.4mm 4.6mm 9.15mm 10.4 x 4.6 x 9.15mm
RS Stock No. 102-4088
Mfr. Part No.TS820-600T
SGD0.872
Each (In a Tube of 50)
units
5A SCR TO-220AB 600V 73A Through Hole 0.2mA 0.8V 5mA 3 10.4mm 4.6mm 9.15mm 10.4 x 4.6 x 9.15mm
RS Stock No. 395-2875
Mfr. Part No.VS-25RIA60
BrandVishay
SGD21.77
Each
units
25A SCR TO-48 600V 440A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 169-5901
Mfr. Part No.25RIA60
BrandVishay
SGD8.956
Each (In a Bag of 100)
units
25A SCR TO-48 600V 440A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 808-3993
Mfr. Part No.NYC0102BLT1G
BrandLittelfuse
SGD0.331
Each (In a Pack of 50)
units
0.25A SCR SOT-23 200V 7A Surface Mount 200µA 0.8V 6mA 3 2.9mm 1.3mm 0.94mm 2.9 x 1.3 x 0.94mm
RS Stock No. 166-0389
Mfr. Part No.BT169G,112
SGD0.114
Each (In a Bag of 1000)
units
0.5A SCR SPT 600V 9A Through Hole 0.2mA 0.8V 5mA 3 4.8mm 4.2mm 5.2mm 4.8 x 4.2 x 5.2mm
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