Thyristors

Thyristors are four-layer semiconductor devices, 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.

How do thyristors work?

Thyristors usually consist 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 Thyristors are 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 thyristors

  • Silicon controlled rectifier (SCR) - The basic purpose of an 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 an 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., Firing circuit commander modules are required for this.
  • 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 its OFF.
  • Diac - Diac is a mix of the words diode and ac switch it is similar to a four-layer diode but it can conduct in both directions meaning it can contact both AC and DC currents.

Applications of thyristors

Thyristors are commonly found in many everyday applications such as:

  • Motor speed controls
  • Pressure control systems
  • Light dimmers
  • Liquid level regulators

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New
RS Stock No. 213-3429
Mfr. Part No.SV6016L2TP
BrandLittelfuse
SGD3.16
Each (In a Pack of 5)
units
- SCR TO-220L 600V - - - - - - - - - -
RS Stock No. 877-3046
Mfr. Part No.TN2540-800G-TR
SGD4.20
Each (In a Pack of 5)
units
16A SCR D2PAK (TO-263) 800V - 314A Surface Mount - 40mA - - 1.3V - 50mA
RS Stock No. 193-694
Mfr. Part No.MCC56-16IO1B
BrandIXYS
SGD42.78
Each
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64A SCR Module TO-240AA 1600V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 668-7016
Mfr. Part No.MCC56-12io1B
BrandIXYS
SGD44.84
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64A SCR Module TO-240AA 1200V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 168-4590
Mfr. Part No.MCO150-16IO1
BrandIXYS
SGD31.92
Each (In a Tube of 10)
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158A - SOT-227B 1600V - 2.16kA Screw Mount - 200mA - - 1.6V - 200mA
RS Stock No. 202-5571
Mfr. Part No.TN2010H-6I
SGD1.403
Each (In a Pack of 10)
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- - - - 20A - Surface Mount 12kW - - - - - -
RS Stock No. 206-8638
Mfr. Part No.TN6050HP-12WY
SGD7.81
Each (In a Pack of 2)
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38 SCR TO-247 1200V - 600A - - 50mA - - - - -
RS Stock No. 167-320
Mfr. Part No.VS-40TPS12-M3
BrandVishay
SGD14.72
Each
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35A SCR TO-247AC 1200V - 600A Through Hole - 150mA - - 2.5V - 150mA
RS Stock No. 202-5577
Mfr. Part No.TN3015H-6I
SGD1.775
Each (In a Pack of 10)
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- - - - 30A - Surface Mount 18kW - - - - - -
RS Stock No. 807-9944
Mfr. Part No.MCR708AT4G
BrandLittelfuse
SGD1.338
Each (On a Tape of 50)
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- SCR DPAK (TO-252) 600V - 35A Surface Mount - 300µA - - 1V - 10mA
RS Stock No. 168-4478
Mfr. Part No.MCC310-16IO1
BrandIXYS
SGD182.91
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320A SCR Module Y2 DCB 1600V - 9.8kA Panel Mount - 150mA - - 2V - 150mA
New
RS Stock No. 216-3104
Mfr. Part No.AR481441
SGD907.40
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- - - - 75A - - - - - - - - -
RS Stock No. 687-1019
Mfr. Part No.TYN640RG
SGD3.95
Each (In a Pack of 2)
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25A SCR TO-220AB 600V - 480A Through Hole - 35mA - - 1.3V - 75mA
RS Stock No. 135-8291
Mfr. Part No.CLA80E1200HF
BrandIXYS
SGD9.12
Each
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80A SCR PLUS247 1200V - 970A Through Hole - 80mA - - 1.6V - 100mA
RS Stock No. 489-3503
Mfr. Part No.PATFC
SGD17.92
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- - - - - - - - - - - - - -
RS Stock No. 165-5510
Mfr. Part No.P0118MA 2AL3
SGD0.236
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0.5A SCR TO-92 600V - 8A Through Hole - 5µA - - 0.8V - 5mA
RS Stock No. 839-1294
Mfr. Part No.TT500N12KOFHPSA2
BrandInfineon
SGD386.31
Each
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500A PCT Module 60mm 1200V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
New
RS Stock No. 216-3054
Mfr. Part No.A437309
SGD439.57
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- - - - 38A - - - - - - - - -
RS Stock No. 700-5068
Mfr. Part No.VS-VSKT162/16PBF
BrandVishay
SGD120.72
Each
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160A SCR INT-A-PAK 1600V - 5.1kA Panel Mount - 270mA - - 4V - 200mA
RS Stock No. 135-8278
Mfr. Part No.CLA30E1200PB
BrandIXYS
SGD3.382
Each (In a Pack of 5)
units
30A SCR TO-220 1200V - 325A Through Hole - 50mA - - 1.6V - 60mA