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. 194-265
Mfr. Part No.MCC312-16IO1
BrandIXYS
MYR660.00
Each
units
320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA
RS Stock No. 168-4451
Mfr. Part No.VHF28-16IO5
BrandIXYS
MYR103.247
Each (In a Box of 10)
units
32A SCR Module FO F A 1600V - 0.33kA Panel Mount - 65mA - - 1V - 100mA
RS Stock No. 177-5202
Mfr. Part No.C106MG
BrandLittelfuse
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Each (In a Box of 500)
units
2.55A SCR TO-225AA 600V - 20A Through Hole - 500µA - - 1V - 6mA
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MYR1,937.99
Each
units
- - - - 17A - Panel Mount 12kW - - - - - -
RS Stock No. 168-4489
Mfr. Part No.MCC312-16IO1
BrandIXYS
MYR638.16
Each (In a Box of 3)
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320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA
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Mfr. Part No.VS-ST180S12P1VPBF
BrandVishay
MYR483.75
Each
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200A SCR TO-93 1200V - 5230A Thread Mount - 150mA - - 3V - 600mA
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Mfr. Part No.MCD95-12io1B
BrandIXYS
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Each
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116A SCR Module TO-240AA 1200V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
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Mfr. Part No.MCD95-12IO1B
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BrandSemikron
MYR324.27
Each
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106A SCR Module SEMIPACK1 1600V - 2.25kA Panel Mount - 150mA - - 3V - 250mA
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MYR5.691
Each (In a Pack of 10)
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8A SCR TO-220AB 600V - 145A Through Hole - 200µA - - 0.8V - 5mA
RS Stock No. 165-2440
Mfr. Part No.VS-ST180S12P1VPBF
BrandVishay
MYR354.354
Each (In a Bag of 12)
units
200A SCR TO-93 1200V - 5230A Thread Mount - 150mA - - 3V - 600mA
RS Stock No. 168-8904
Mfr. Part No.TYN612RG
MYR4.255
Each (In a Tube of 50)
units
8A SCR TO-220AB 600V - 145A Through Hole - 200µA - - 0.8V - 5mA
RS Stock No. 194-041
Mfr. Part No.MCC162-16IO1
BrandIXYS
MYR270.02
Each
units
190A SCR Module Y4 M6 1600V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
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MYR373.93
Each
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- - - - 25A - Panel Mount 6kW - - - - - -
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BrandSemikron
MYR301.66
Each
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30A SCR Module SEMIPONT®1 1200V - 0.32kA Screw Mount - 100mA - - 2V - 150mA
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Mfr. Part No.MCC162-16IO1
BrandIXYS
MYR246.55
Each (In a Box of 6)
units
190A SCR Module Y4 M6 1600V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 485-4299
Mfr. Part No.BT169G,112
MYR1.418
Each (In a Pack of 25)
units
0.5A SCR SPT 600V - 9A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 700-5591
Mfr. Part No.VS-70TPS12PBF
BrandVishay
MYR34.42
Each
units
70A SCR Super-247 1200V - 1400A Through Hole - 100mA - - 1.5V - 200mA
RS Stock No. 145-1769
Mfr. Part No.VS-70TPS12PBF
BrandVishay
MYR26.264
Each (In a Tube of 25)
units
70A SCR Super-247 1200V - 1400A Through Hole - 100mA - - 1.5V - 200mA
RS Stock No. 905-6204
Mfr. Part No.SKKT 250/16E
BrandSemikron
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250A SCR A 73b 1600V - 9000A Panel Mount - 200mA - - 3V - 500mA