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 used in 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. 214-3963
Mfr. Part No.QVR-TB-RFI
£56.58
Each
Units
- - - - - - Panel Mount - - - - - - -
RS Stock No. 379-6518
Mfr. Part No.PAC-2
£63.98
Each
Units
- - - - - - Screw Mount - - 3500Vrms 250V ac - - -
RS Stock No. 194-265
Mfr. Part No.MCC312-16IO1
BrandIXYS
£106.82
Each
Units
320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA
RS Stock No. 168-4489
Mfr. Part No.MCC312-16IO1
BrandIXYS
£106.823
Each (In a Box of 3)
Units
320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA
RS Stock No. 262-8335
Mfr. Part No.SKKH 92/16 E
BrandSemikron
£89.53
Each
Units
95A SCR Module SEMIPACK1 1600V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 214-3979
Mfr. Part No.ZVS-16DV
£59.37
Each
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- - - - 16A - Screw Mount 3.7kW - - - - - -
RS Stock No. 841-924
Mfr. Part No.PSR-25
£38.55
Each
Units
- - - - 25A - Panel Mount 6kW - - - - - -
RS Stock No. 509-566
Mfr. Part No.BT151-500R,127
£0.355
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
£0.355
Each (In a Tube of 50)
Units
7.5A SCR TO-220AB 500V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS Stock No. 165-2391
Mfr. Part No.VS-50RIA120
BrandVishay
£15.473
Each (In a Bag of 100)
Units
50A SCR TO-65 1200V - 1490A Thread Mount - 100mA - - 2.5V - 200mA
RS Stock No. 395-3474
Mfr. Part No.VS-50RIA120
BrandVishay
£19.59
Each
Units
50A SCR TO-65 1200V - 1490A Thread Mount - 100mA - - 2.5V - 200mA
RS Stock No. 262-488
Mfr. Part No.BT152-600R,127
£0.85
Each
Units
13A SCR TO-220AB 650V - 220A Through Hole - 32mA - - 1.5V - 60mA
RS Stock No. 103-8143
Mfr. Part No.BT152-600R,127
£0.719
Each (In a Tube of 50)
Units
13A SCR TO-220AB 650V - 220A Through Hole - 32mA - - 1.5V - 60mA
RS Stock No. 658-148
Mfr. Part No.SKPC200-240
BrandSemikron
£385.35
Each
Units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 271-814
Mfr. Part No.SKKT 92B16E
BrandSemikron
£29.77
Each
Units
95A SCR Module SEMIPACK1 1600V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 748-0844
Mfr. Part No.A34462
£450.79
Each
Units
- - - - - - Screw Mount - - 3500Vrms 440V ac - - -
RS Stock No. 232-9353
Mfr. Part No.FC11AL/2
£102.47
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 232-9347
Mfr. Part No.FC36M
£278.20
Each
Units
- - - - - - - - - 3500Vrms - - 5V dc -
RS Stock No. 183-2268
Mfr. Part No.SKCH 28/12
BrandSemikron
£35.86
Each
Units
30A SCR Module SEMIPONT®1 1200V - 0.32kA Screw Mount - 100mA - - 2V - 150mA
RS Stock No. 841-930
Mfr. Part No.TPSR-25
£37.28
Each
Units
- - - - - - - - - - - - - -