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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Description Price Rated Average On-State Current Thyristor Type Package Type Repetitive Peak Reverse Voltage Current Rating Surge Current Rating Mounting Type Power Rating Maximum Gate Trigger Current Output Isolation Input Voltage AC Maximum Gate Trigger Voltage Input Voltage DC Maximum Holding Current
RS Stock No. 817-2406
Mfr. Part No.VS-25RIA80
BrandVishay
SGD18.96
Each
units
25A SCR TO-208AA 800V - 440A Thread Mount - 90mA - - 3V - 130mA
RS Stock No. 165-6020
Mfr. Part No.VS-25RIA80
BrandVishay
SGD21.053
Each (In a Bag of 100)
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25A SCR TO-208AA 800V - 440A Thread Mount - 90mA - - 3V - 130mA
RS Stock No. 169-5901
Mfr. Part No.25RIA60
BrandVishay
SGD18.055
Each (In a Bag of 100)
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25A SCR TO-48 600V - 440A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 395-2875
Mfr. Part No.VS-25RIA60
BrandVishay
SGD23.70
Each
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25A SCR TO-48 600V - 440A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 395-3474
Mfr. Part No.VS-50RIA120
BrandVishay
SGD36.06
Each
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50A SCR TO-65 1200V - 1490A Thread Mount - 100mA - - 2.5V - 200mA
RS Stock No. 165-2391
Mfr. Part No.VS-50RIA120
BrandVishay
SGD28.014
Each (In a Bag of 100)
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50A SCR TO-65 1200V - 1490A Thread Mount - 100mA - - 2.5V - 200mA
RS Stock No. 301-619
Mfr. Part No.VS-40TPS12A-M3
BrandVishay
SGD12.95
Each
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35A SCR TO-247AC 1200V - 600A Through Hole - 40mA - - 2.5V - 150mA
RS Stock No. 919-4404
Mfr. Part No.VS-40TPS12A-M3
BrandVishay
SGD11.14
Each (In a Tube of 25)
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35A SCR TO-247AC 1200V - 600A Through Hole - 40mA - - 2.5V - 150mA
RS Stock No. 165-6350
Mfr. Part No.VS-VSKT91/16
BrandVishay
SGD68.387
Each (In a Box of 10)
units
95A SCR, SCR Module TO-240AA 1600V - 2000A Panel Mount - 270mA - - 4V - 250mA
RS Stock No. 700-5576
Mfr. Part No.VS-181RKI40PBF
BrandVishay
SGD97.93
Each
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180A PCT TO-93 400V - 4000A Thread Mount - 150mA - - 2.5V - 600mA
RS Stock No. 165-2988
Mfr. Part No.VS-VSKH56/12
BrandVishay
SGD57.572
Each (In a Box of 10)
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60A SCR TO-240AA 1200V - 1.2kA Panel Mount - 270mA - - 4V - 200mA
RS Stock No. 700-5037
Mfr. Part No.VS-VSKH56/12
BrandVishay
SGD61.73
Each
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60A SCR TO-240AA 1200V - 1.2kA Panel Mount - 270mA - - 4V - 200mA
RS Stock No. 165-2845
Mfr. Part No.VS-181RKI40PBF
BrandVishay
SGD76.447
Each (In a Bag of 12)
units
180A PCT TO-93 400V - 4000A Thread Mount - 150mA - - 2.5V - 600mA
RS Stock No. 877-6382
Mfr. Part No.VS-VSKT91/16
BrandVishay
SGD73.32
Each
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95A SCR, SCR Module TO-240AA 1600V - 2000A Panel Mount - 270mA - - 4V - 250mA
RS Stock No. 165-2945
Mfr. Part No.VS-P102W
BrandVishay
SGD47.066
Each (In a Box of 10)
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25A SCR Module PACE-PAK 600V - 0.375kA Screw Mount - 60mA - - 2V - 130mA
RS Stock No. 700-5601
Mfr. Part No.VS-P102W
BrandVishay
SGD55.88
Each
units
25A SCR Module PACE-PAK 600V - 0.375kA Screw Mount - 60mA - - 2V - 130mA
RS Stock No. 227-9062
Mfr. Part No.VS-16RIA120
BrandVishay
SGD23.47
Each
units
16A SCR TO-48 1200V - 360A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 167-314
Mfr. Part No.VS-40TPS08-M3
BrandVishay
SGD10.07
Each
units
35A SCR TO-247AC 800V - 600A Through Hole - 150mA - - 2.5V - 150mA
RS Stock No. 817-2459
Mfr. Part No.VS-50RIA100
BrandVishay
SGD31.53
Each
units
80A SCR TO-65 1000V - 1490A Thread Mount - 250mA - - 3.5V - 200mA
RS Stock No. 169-5898
Mfr. Part No.22RIA100
BrandVishay
SGD20.941
Each (In a Bag of 100)
units
22A SCR TO-48 1000V - 420A Thread Mount - 60mA - - 2V - 130mA