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. 509-566
Mfr. Part No.BT151-500R,127
HK$4.658
Each (In a Pack of 10)
units
7.5A SCR TO-220AB 500V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS Stock No. 168-9404
Mfr. Part No.BT151-500R,127
HK$4.66
Each (In a Tube of 50)
units
7.5A SCR TO-220AB 500V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS Stock No. 177-5212
Mfr. Part No.2N6508G
BrandLittelfuse
HK$13.22
Each (In a Box of 500)
units
16A SCR TO-220AB 600V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS Stock No. 395-2831
Mfr. Part No.VS-22RIA40
BrandVishay
HK$129.30
Each
units
22A SCR TO-48 400V - 420A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 169-5899
Mfr. Part No.22RIA40
BrandVishay
HK$105.296
Each (In a Bag of 100)
units
22A SCR TO-48 400V - 420A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 862-4929
Mfr. Part No.2N6508G
BrandLittelfuse
HK$12.562
Each (In a Pack of 10)
units
16A SCR TO-220AB 600V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS Stock No. 193-717
Mfr. Part No.MCC95-16IO1B
BrandIXYS
HK$336.44
Each
units
116A SCR Module TO-240AA 1600V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 177-5352
Mfr. Part No.MCC95-16IO1B
BrandIXYS
HK$309.205
Each (In a Box of 36)
units
116A SCR Module TO-240AA 1600V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 379-6518
Mfr. Part No.PAC-2
HK$827.29
Each
units
- - - - - - Screw Mount - - 3500Vrms 250V ac - - -
RS Stock No. 841-924
Mfr. Part No.PSR-25
HK$509.05
Each
units
- - - - 25A - Panel Mount 6kW - - - - - -
RS Stock No. 122-1378
Mfr. Part No.PR3-DIN-18kW
HK$2,012.97
Each
units
- - - - 25A - DIN Rail 18kW - - - - - -
RS Stock No. 668-7016
Mfr. Part No.MCC56-12io1B
BrandIXYS
HK$229.09
Each
units
64A SCR Module TO-240AA 1200V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 177-5360
Mfr. Part No.MCC56-12IO1B
BrandIXYS
HK$214.821
Each (In a Box of 36)
units
64A SCR Module TO-240AA 1200V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 227-9236
Mfr. Part No.VS-VSKT250-12PBF
BrandVishay
HK$1,661.84
Each
units
250A SCR MAGN-A-PAK 1200V - 8.9kA Panel Mount - 350mA - - 4V - 500mA
RS Stock No. 169-5843
Mfr. Part No.VSKT250-12PBF
BrandVishay
HK$1,685.94
Each (In a Box of 2)
units
250A SCR MAGN-A-PAK 1200V - 8.9kA Panel Mount - 350mA - - 4V - 500mA
RS Stock No. 905-6128
Mfr. Part No.SKKT 92/16 E
BrandSemikron
HK$708.38
Each
units
100A - A 10 1600V - 2500A Panel Mount - - - - - - -
RS Stock No. 357-3438
Mfr. Part No.VS-ST083S08PFM1P
BrandVishay
HK$817.96
Each
units
85A SCR TO-94 800V - 2560A Thread Mount - 200mA - - 3V - 600mA
RS Stock No. 165-2437
Mfr. Part No.VS-ST083S08PFM1P
BrandVishay
HK$758.95
Each (In a Bag of 25)
units
85A SCR TO-94 800V - 2560A Thread Mount - 200mA - - 3V - 600mA
RS Stock No. 296-3981
Mfr. Part No.SKPC200-440
BrandSemikron
HK$1,439.41
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 493-077
Mfr. Part No.PR1-DIN-2.5KW
HK$498.65
Each
units
- - - - 11A - DIN Rail 2.5kW - - - - - -