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. 395-9286
Mfr. Part No.VS-ST230S12P1VPBF
BrandVishay
MYR506.72
Each
units
230A SCR TO-93 1200V - 5970A Thread Mount - 150mA - - 3V - 600mA
RS Stock No. 165-2442
Mfr. Part No.VS-ST230S12P1VPBF
BrandVishay
MYR462.588
Each (In a Bag of 12)
units
230A SCR TO-93 1200V - 5970A Thread Mount - 150mA - - 3V - 600mA
RS Stock No. 165-2611
Mfr. Part No.VS-ST230C16C0
BrandVishay
MYR322.35
Each (In a Box of 12)
units
410A PCT TO-200AB 1600V - 5970A Screw Mount - 150mA - - 3V - 600mA
RS Stock No. 227-9214
Mfr. Part No.VS-ST230C16C0
BrandVishay
MYR326.07
Each
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410A PCT TO-200AB 1600V - 5970A Screw Mount - 150mA - - 3V - 600mA
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. 395-9258
Mfr. Part No.VS-ST180S12P1VPBF
BrandVishay
MYR483.75
Each
units
200A SCR TO-93 1200V - 5230A Thread Mount - 150mA - - 3V - 600mA
RS Stock No. 145-1769
Mfr. Part No.VS-70TPS12PBF
BrandVishay
MYR26.264
Each (In a Tube of 25)
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70A SCR Super-247 1200V - 1400A Through Hole - 100mA - - 1.5V - 200mA
RS Stock No. 700-5591
Mfr. Part No.VS-70TPS12PBF
BrandVishay
MYR34.42
Each
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70A SCR Super-247 1200V - 1400A Through Hole - 100mA - - 1.5V - 200mA
RS Stock No. 165-2886
Mfr. Part No.VS-110RKI120PBF
BrandVishay
MYR179.166
Each (In a Bag of 25)
units
110A PCT TO-94 1200V - 2180A Thread Mount - 120mA - - 2V - 200mA
RS Stock No. 700-5554
Mfr. Part No.VS-110RKI120PBF
BrandVishay
MYR239.49
Each
units
110A PCT TO-94 1200V - 2180A Thread Mount - 120mA - - 2V - 200mA
RS Stock No. 395-9185
Mfr. Part No.VS-T70RIA120
BrandVishay
MYR134.66
Each
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70A SCR D 55 1200V - 1740A Panel Mount - 120mA - - 2.5V - 200mA
RS Stock No. 700-5585
Mfr. Part No.VS-25RIA120S90
BrandVishay
MYR98.47
Each
units
25A SCR TO-48 1200V - 440A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 169-5956
Mfr. Part No.T70RIA120
BrandVishay
MYR132.874
Each (In a Box of 10)
units
70A SCR D 55 1200V - 1740A Panel Mount - 120mA - - 2.5V - 200mA
RS Stock No. 700-5620
Mfr. Part No.VS-P405W
BrandVishay
MYR189.33
Each
units
40A SCR Module PACE-PAK 1200V - 0.4kA Screw Mount - 60mA - - 2V - 130mA
RS Stock No. 165-2948
Mfr. Part No.VS-P405W
BrandVishay
MYR156.599
Each (In a Box of 10)
units
40A SCR Module PACE-PAK 1200V - 0.4kA Screw Mount - 60mA - - 2V - 130mA
RS Stock No. 165-2662
Mfr. Part No.VS-25RIA120S90
BrandVishay
MYR81.562
Each (In a Bag of 100)
units
25A SCR TO-48 1200V - 440A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 395-2869
Mfr. Part No.VS-25RIA120M
BrandVishay
MYR68.37
Each
units
25A SCR TO-48 1200V - 440A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 700-5636
Mfr. Part No.VS-ST230S08P0VPBF
BrandVishay
MYR505.18
Each
units
230A SCR TO-93 800V - 5970A Thread Mount - 150mA - - 3V - 600mA
RS Stock No. 301-619
Mfr. Part No.VS-40TPS12A-M3
BrandVishay
MYR43.20
Each
units
35A SCR TO-247AC 1200V - 600A Through Hole - 40mA - - 2.5V - 150mA
RS Stock No. 145-1770
Mfr. Part No.VS-70TPS16PBF
BrandVishay
MYR28.108
Each (In a Tube of 25)
units
70A SCR Super-247 1600V - 1400A Through Hole - 100mA - - 1.5V - 200mA