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. 395-2875
Mfr. Part No.VS-25RIA60
BrandVishay
HK$136.86
Each
units
25A SCR TO-48 600V - 440A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 168-4724
Mfr. Part No.MCMA140P1600TA
BrandIXYS
HK$387.533
Each (In a Box of 6)
units
140A SCR Module TO-240 1600V - 2.59kA Panel Mount - 200mA - - 1.6V - 200mA
RS Stock No. 227-9090
Mfr. Part No.VS-22RIA120
BrandVishay
HK$192.39
Each
units
22A SCR TO-48 1200V - 420A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 167-314
Mfr. Part No.VS-40TPS08-M3
BrandVishay
HK$58.22
Each
units
35A SCR TO-247AC 800V - 600A Through Hole - 150mA - - 2.5V - 150mA
RS Stock No. 817-2428
Mfr. Part No.VS-2N5206
BrandVishay
HK$173.50
Each
units
22A SCR TO-208AA 1000V - 340A Thread Mount - 80mA - - 3V - 200mA
RS Stock No. 145-1785
Mfr. Part No.VS-40TPS16-M3
BrandVishay
HK$63.346
Each (In a Tube of 25)
units
35A SCR TO-247AC 1600V - 600A Through Hole - 150mA - - 2.5V - 150mA
RS Stock No. 395-2825
Mfr. Part No.VS-22RIA100
BrandVishay
HK$131.02
Each
units
22A SCR TO-48 1000V - 420A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 919-4404
Mfr. Part No.VS-40TPS12A-M3
BrandVishay
HK$64.418
Each (In a Tube of 25)
units
35A SCR TO-247AC 1200V - 600A Through Hole - 40mA - - 2.5V - 150mA
RS Stock No. 165-2391
Mfr. Part No.VS-50RIA120
BrandVishay
HK$161.994
Each (In a Bag of 100)
units
50A SCR TO-65 1200V - 1490A Thread Mount - 100mA - - 2.5V - 200mA
RS Stock No. 169-5898
Mfr. Part No.22RIA100
BrandVishay
HK$123.265
Each (In a Bag of 100)
units
22A SCR TO-48 1000V - 420A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 145-1745
Mfr. Part No.VS-40TPS08-M3
BrandVishay
HK$49.413
Each (In a Tube of 25)
units
35A SCR TO-247AC 800V - 600A Through Hole - 150mA - - 2.5V - 150mA
RS Stock No. 165-5554
Mfr. Part No.TDB6HK95N16LOFHOSA1
BrandInfineon
HK$1,560.763
Each (In a Tray of 3)
units
95A IGBT ISOPACK 1600V - 720A Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 919-4384
Mfr. Part No.VS-30TPS16-M3
BrandVishay
HK$37.38
Each (In a Tube of 25)
units
20A SCR TO-247AC 1600V - 300A Through Hole - 45mA - - 2V - 100mA
RS Stock No. 817-2453
Mfr. Part No.VS-50RIA20
BrandVishay
HK$132.62
Each
units
80A SCR TO-65 200V - 1490A Thread Mount - 250mA - - 3.5V - 200mA
RS Stock No. 839-1238
Mfr. Part No.TDB6HK95N16LOFHOSA1
BrandInfineon
HK$1,560.76
Each
units
95A IGBT ISOPACK 1600V - 720A Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 167-320
Mfr. Part No.VS-40TPS12-M3
BrandVishay
HK$85.06
Each
units
35A SCR TO-247AC 1200V - 600A Through Hole - 150mA - - 2.5V - 150mA
RS Stock No. 878-1631
Mfr. Part No.S8035KTP
BrandLittelfuse
HK$33.338
Each (In a Pack of 250)
units
35A SCR TO-218AC 800V - 500A Through Hole - - - - 1.5V - 50mA
RS Stock No. 271-814
Mfr. Part No.SKKT 92B16E
BrandSemikron
HK$493.83
Each
units
95A SCR Module SEMIPACK1 1600V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 165-6021
Mfr. Part No.VS-2N5206
BrandVishay
HK$134.327
Each (In a Bag of 100)
units
22A SCR TO-208AA 1000V - 340A Thread Mount - 80mA - - 3V - 200mA
RS Stock No. 254-0544
Mfr. Part No.VS-25RIA120
BrandVishay
HK$197.98
Each
units
25A SCR TO-48 1200V - 440A Thread Mount - 60mA - - 2V - 130mA