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. 700-5639
Mfr. Part No.VS-ST380CH06C1
BrandVishay
TWD3,297
Each
units
960A PCT TO-200AB 600V 13000A Screw Mount 200mA 3V 600mA 3 42mm 42mm 15.1mm 42 x 42 x 15.1mm
RS Stock No. 165-2655
Mfr. Part No.VS-ST380CH06C1
BrandVishay
TWD5,575
Each (In a Box of 12)
units
960A PCT TO-200AB 600V 13000A Screw Mount 200mA 3V 600mA 3 42mm 42mm 15.1mm 42 x 42 x 15.1mm
RS Stock No. 839-1379
Mfr. Part No.T560N12TOFXPSA1
BrandInfineon
TWD2,717
Each
units
559A PCT BG-T4814K0-1 1200V 7100A Stud 200mA 2V 300mA 5 - - 14.5mm 48 (Dia.) x 14.5 (Height)mm
RS Stock No. 169-5882
Mfr. Part No.80RIA80PBF
BrandVishay
TWD939
Each (In a Bag of 25)
units
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. 395-9309
Mfr. Part No.VS-ST330S12P1PBF
BrandVishay
TWD3,547
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. 169-5960
Mfr. Part No.ST330S12P1PBF
BrandVishay
TWD4,558
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. 357-4324
Mfr. Part No.VS-80RIA80PBF
BrandVishay
TWD2,617
Each
units
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. 905-6178
Mfr. Part No.SKT 1200/16 E
BrandSemikron
TWD9,657
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. 700-5633
Mfr. Part No.VS-ST700C18L1
BrandVishay
TWD4,453
Each
units
910A PCT TO-200AC 1800V 16400A Screw Mount 200mA 3V 600mA 2 58.5mm 58.5mm 27mm 58.5 x 58.5 x 27mm
RS Stock No. 165-6236
Mfr. Part No.VS-50RIA100
BrandVishay
TWD708
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. 485-4299
Mfr. Part No.BT169G,112
TWD5
Each (In a Pack of 25)
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
RS Stock No. 817-2459
Mfr. Part No.VS-50RIA100
BrandVishay
TWD584
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. 145-2613
Mfr. Part No.VS-ST700C18L1
BrandVishay
TWD5,205
Each (In a Box of 3)
units
910A PCT TO-200AC 1800V 16400A Screw Mount 200mA 3V 600mA 2 58.5mm 58.5mm 27mm 58.5 x 58.5 x 27mm
RS Stock No. 166-0389
Mfr. Part No.BT169G,112
TWD3
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
RS Stock No. 545-0006
Mfr. Part No.2N6509G
BrandLittelfuse
TWD43
Each
units
16A SCR TO-220AB 800V 250A Through Hole 30mA 1.5V 40mA 3 10.28mm 4.82mm 9.28mm 10.28 x 4.82 x 9.28mm
RS Stock No. 760-9279
Mfr. Part No.DCR1010G14
BrandDynex
TWD4,540
Each
units
1010A SCR Type G 1400V 15000A Stud 300mA 3V 200mA 3 - - 26.5mm 58 (Dia.) x 26.5mm
RS Stock No. 168-4648
Mfr. Part No.DCR1010G14
BrandDynex
TWD5,491
Each (In a Box of 7)
units
1010A SCR Type G 1400V 15000A Stud 300mA 3V 200mA 3 - - 26.5mm 58 (Dia.) x 26.5mm
RS Stock No. 810-3693
Mfr. Part No.TYN608RG
TWD29
Each (In a Pack of 10)
units
8A SCR TO-220AB 600V 100A Through Hole 15mA 1.3V 30mA 3 10.4mm 4.6mm 15.9mm 10.4 x 4.6 x 15.9mm
RS Stock No. 800-9200
Mfr. Part No.2N6509TG
BrandLittelfuse
TWD42
Each (In a Pack of 10)
units
- SCR TO-220 800V 250A Through Hole 75mA 1.5V 80mA 3 10.28mm 4.82mm 15.75mm 10.28 x 4.82 x 15.75mm
RS Stock No. 103-2940
Mfr. Part No.2N6509G
BrandLittelfuse
TWD28
Each (In a Box of 500)
units
16A SCR TO-220AB 800V 250A Through Hole 30mA 1.5V 40mA 3 10.28mm 4.82mm 9.28mm 10.28 x 4.82 x 9.28mm