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. 194-209
Mfr. Part No.MCD162-16IO1
BrandIXYS
SGD84.71
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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
SGD84.713
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. 462-196
Mfr. Part No.MCC501-16io2
BrandIXYS
SGD330.29
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985A SCR Module - 1600V - 16kA Panel Mount - 250mA - - 2.5V - 300mA
RS Stock No. 177-5340
Mfr. Part No.MCC501-16IO2
BrandIXYS
SGD263.36
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985A SCR Module - 1600V - 16kA Panel Mount - 250mA - - 2.5V - 300mA
RS Stock No. 194-265
Mfr. Part No.MCC312-16IO1
BrandIXYS
SGD228.30
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320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA
RS Stock No. 194-338
Mfr. Part No.MCD95-16IO1B
BrandIXYS
SGD51.35
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116A SCR Module TO-240AA 1600V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
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. 177-5354
Mfr. Part No.MCC94-22IO1B
BrandIXYS
SGD72.093
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104A SCR Module TO-240AA 2200V - 1.8kA Panel Mount - 100mA - - 1.5V - 150mA
RS Stock No. 194-271
Mfr. Part No.MCC94-22IO1B
BrandIXYS
SGD81.90
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104A SCR Module TO-240AA 2200V - 1.8kA Panel Mount - 100mA - - 1.5V - 150mA
RS Stock No. 761-4000
Mfr. Part No.CS45-12io1
BrandIXYS
SGD8.44
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48A SCR TO-247AD 1200V - 560A Through Hole - 200mA - - 1.6V - 100mA
RS Stock No. 194-805
Mfr. Part No.MCD56-16IO1B
BrandIXYS
SGD40.11
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64A SCR Module TO-240AA 1600V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 168-4652
Mfr. Part No.CS45-12IO1
BrandIXYS
SGD6.605
Each (In a Tube of 30)
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48A SCR TO-247AD 1200V - 560A Through Hole - 200mA - - 1.6V - 100mA
RS Stock No. 177-5357
Mfr. Part No.MCD56-16IO1B
BrandIXYS
SGD35.343
Each (In a Box of 36)
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64A SCR Module TO-240AA 1600V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 462-142
Mfr. Part No.MCD200-16IO1
BrandIXYS
SGD129.06
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216A SCR Module Y4 M6 1600V - 8.6kA Panel Mount - 150mA - - 2V - 150mA
RS Stock No. 768-9017
Mfr. Part No.N0910LC200
BrandIXYS
SGD353.57
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910A PCT N0910 2000V - 9200A Stud - 300mA - - 3V - 1000mA
RS Stock No. 197-810
Mfr. Part No.CS45-16IO1
BrandIXYS
SGD8.51
Each
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48A SCR TO-247AD 1600V - 560A Through Hole - 100mA - - 1.5V - 100mA
RS Stock No. 920-0791
Mfr. Part No.CS45-16IO1
BrandIXYS
SGD7.224
Each (In a Tube of 30)
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48A SCR TO-247AD 1600V - 560A Through Hole - 100mA - - 1.5V - 100mA
RS Stock No. 668-7029
Mfr. Part No.MCC95-12io1B
BrandIXYS
SGD52.34
Each
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116A SCR Module TO-240AA 1200V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 146-1690
Mfr. Part No.MCC26-16IO1B
BrandIXYS
SGD32.151
Each (In a Box of 36)
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32A SCR Module TO-240AA 1600V - 0.56kA Panel Mount - 100mA - - 1.5V - 200mA