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. 165-2655
Mfr. Part No.VS-ST380CH06C1
BrandVishay
TWD4,016.10
Each (In a Box of 12)
units
960A PCT TO-200AB 600V - 13000A Screw Mount - 200mA - - 3V - 600mA
RS Stock No. 700-5639
Mfr. Part No.VS-ST380CH06C1
BrandVishay
TWD5,591.00
Each
units
960A PCT TO-200AB 600V - 13000A Screw Mount - 200mA - - 3V - 600mA
RS Stock No. 905-6119
Mfr. Part No.SKKH 72/16 E
BrandSemikron
TWD1,250.00
Each
units
70A SCR A 43a 1600V - 9000A Panel Mount - 150mA - - 2V - 500mA
RS Stock No. 395-9309
Mfr. Part No.VS-ST330S12P1PBF
BrandVishay
TWD6,631.00
Each
units
330A SCR TO-118 1200V - 9420A Stud - 200mA - - 3V - 600mA
RS Stock No. 905-6134
Mfr. Part No.SKKT 106/18 E
BrandSemikron
TWD4,203.00
Each
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600A - A 42 1800V - 22000A Panel Mount - - - - - - -
RS Stock No. 169-5960
Mfr. Part No.ST330S12P1PBF
BrandVishay
TWD5,799.00
Each (In a Bag of 6)
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330A SCR TO-118 1200V - 9420A Stud - 200mA - - 3V - 600mA
RS Stock No. 905-6178
Mfr. Part No.SKT 1200/16 E
BrandSemikron
TWD10,267.00
Each
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840A SCR B 14 1600V - 30000A Panel Mount - 250mA - - 3V - 500mA
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Mfr. Part No.VS-80RIA80PBF
BrandVishay
TWD1,458.00
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80A PCT TO-94 800V - 1990A Thread Mount - 120mA - - 2.5V - 200mA
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Mfr. Part No.80RIA80PBF
BrandVishay
TWD1,303.10
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80A PCT TO-94 800V - 1990A Thread Mount - 120mA - - 2.5V - 200mA
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Mfr. Part No.BT169G,112
TWD3.70
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0.5A SCR SPT 600V - 9A Through Hole - 0.2mA - - 0.8V - 5mA
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Mfr. Part No.VS-ST700C18L1
BrandVishay
TWD5,484.70
Each (In a Box of 3)
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910A PCT TO-200AC 1800V - 16400A Screw Mount - 200mA - - 3V - 600mA
RS Stock No. 817-2459
Mfr. Part No.VS-50RIA100
BrandVishay
TWD838.00
Each
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80A SCR TO-65 1000V - 1490A Thread Mount - 250mA - - 3.5V - 200mA
RS Stock No. 700-5633
Mfr. Part No.VS-ST700C18L1
BrandVishay
TWD5,485.00
Each
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910A PCT TO-200AC 1800V - 16400A Screw Mount - 200mA - - 3V - 600mA
RS Stock No. 485-4299
Mfr. Part No.BT169G,112
TWD12.80
Each (In a Pack of 25)
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0.5A SCR SPT 600V - 9A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 165-6236
Mfr. Part No.VS-50RIA100
BrandVishay
TWD645.70
Each (In a Bag of 100)
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80A SCR TO-65 1000V - 1490A Thread Mount - 250mA - - 3.5V - 200mA
RS Stock No. 194-209
Mfr. Part No.MCD162-16IO1
BrandIXYS
TWD2,312.00
Each
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190A SCR Module Y4 M6 1600V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 146-1695
Mfr. Part No.MCD162-16IO1
BrandIXYS
TWD2,312.30
Each (In a Box of 6)
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190A SCR Module Y4 M6 1600V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 183-2268
Mfr. Part No.SKCH 28/12
BrandSemikron
TWD1,868.00
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30A SCR Module SEMIPONT®1 1200V - 0.32kA Screw Mount - 100mA - - 2V - 150mA
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Mfr. Part No.SKKT 162/16 E
BrandSemikron
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156A SCR Module SEMIPACK2 1600V - 5.4kA Panel Mount - 150mA - - 2V - 400mA
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BrandLittelfuse
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16A SCR TO-220AB 800V - 250A Through Hole - 30mA - - 1.5V - 40mA