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. 774-3467
Mfr. Part No.C106DG
BrandLittelfuse
SGD0.758
Each (In a Pack of 10)
units
2.55A SCR TO-225AA 400V - 20A Through Hole - 500µA - - 1V - 6mA
RS Stock No. 177-5355
Mfr. Part No.MCD95-16IO1B
BrandIXYS
SGD43.711
Each (In a Box of 36)
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116A SCR Module TO-240AA 1600V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 168-4489
Mfr. Part No.MCC312-16IO1
BrandIXYS
SGD226.307
Each (In a Box of 3)
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320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA
RS Stock No. 760-9294
Mfr. Part No.DCR960G18
BrandDynex
SGD292.72
Each
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960A SCR Type G 1800V - 14000A Stud - 300mA - - 3V - 200mA
RS Stock No. 168-8046
Mfr. Part No.TXN625RG
SGD3.875
Each (In a Tube of 50)
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16A SCR TO-220AB 600V - 314A Through Hole - 40mA - - 1.3V - 50mA
RS Stock No. 146-1718
Mfr. Part No.DCR960G18
BrandDynex
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Each (In a Box of 7)
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960A SCR Type G 1800V - 14000A Stud - 300mA - - 3V - 200mA
RS Stock No. 905-6122
Mfr. Part No.SKKT 106/16 E
BrandSemikron
SGD45.47
Each
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106A SCR A 46 1600V - 2250A Panel Mount - 150mA - - 3V - 250mA
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Mfr. Part No.CM-FC36 (M/MV)
SGD283.93
Each
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- - - - - - - - - - - - - -
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Mfr. Part No.TXN625RG
SGD4.558
Each (In a Pack of 5)
units
16A SCR TO-220AB 600V - 314A Through Hole - 40mA - - 1.3V - 50mA
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. 145-8864
Mfr. Part No.TT570N16KOFHPSA2
BrandInfineon
SGD424.59
Each (In a Tray of 2)
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600A PCT Module 60mm 1600V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 808-3993
Mfr. Part No.NYC0102BLT1G
BrandLittelfuse
SGD0.518
Each (In a Pack of 50)
units
0.25A SCR SOT-23 200V - 7A Surface Mount - 200µA - - 0.8V - 6mA
RS Stock No. 102-4088
Mfr. Part No.TS820-600T
SGD1.932
Each (In a Tube of 50)
units
5A SCR TO-220AB 600V - 73A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 839-1304
Mfr. Part No.TT570N16KOFHPSA2
BrandInfineon
SGD424.59
Each
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600A PCT Module 60mm 1600V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 355-2841
Mfr. Part No.TS820-600T
SGD2.26
Each
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5A SCR TO-220AB 600V - 73A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 395-2875
Mfr. Part No.VS-25RIA60
BrandVishay
SGD23.70
Each
units
25A SCR TO-48 600V - 440A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 183-2268
Mfr. Part No.SKCH 28/12
BrandSemikron
SGD86.25
Each
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30A SCR Module SEMIPONT®1 1200V - 0.32kA Screw Mount - 100mA - - 2V - 150mA
RS Stock No. 760-9281
Mfr. Part No.DCR720E18
BrandDynex
SGD156.06
Each
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720A SCR Type G 1800V - 8300A Stud - 300mA - - 3V - 200mA
RS Stock No. 905-6190
Mfr. Part No.SKKT 162/22 E H4
BrandSemikron
SGD263.85
Each
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143A SCR SEMIPACK2 2200V - 5200A Panel Mount - 150mA - - 2V - 400mA
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SGD0.142
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0.5A SCR SPT 400V - 9A Through Hole - 0.2mA - - 0.8V - 5mA