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. 146-1695
Mfr. Part No.MCD162-16IO1
BrandIXYS
SGD75.89
Each (In a Box of 6)
units
190A SCR Module Y4 M6 1600V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 194-209
Mfr. Part No.MCD162-16IO1
BrandIXYS
SGD77.63
Each
units
190A SCR Module Y4 M6 1600V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 658-148
Mfr. Part No.SKPC200-240
BrandSemikron
SGD460.44
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 905-6178
Mfr. Part No.SKT 1200/16 E
BrandSemikron
SGD441.56
Each
units
840A SCR B 14 1600V - 30000A Panel Mount - 250mA - - 3V - 500mA
RS Stock No. 810-7392
Mfr. Part No.BTW69-600RG
SGD9.21
Each
units
- SCR TOP3 - - - Through Hole - - - - - - -
RS Stock No. 168-7882
Mfr. Part No.BTW69-600RG
SGD7.81
Each (In a Tube of 30)
units
- SCR TOP3 - - - Through Hole - - - - - - -
RS Stock No. 468-2369
Mfr. Part No.SKKH 106/16 E
BrandSemikron
SGD70.40
Each
units
106A SCR Module SEMIPACK1 1600V - 2.25kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 232-9347
Mfr. Part No.FC36M
SGD449.28
Each
units
- - - - - - - - - 3500Vrms - - 5V dc -
RS Stock No. 841-924
Mfr. Part No.PSR-25
SGD93.08
Each
units
- - - - 25A - Panel Mount 6kW - - - - - -
RS Stock No. 177-5340
Mfr. Part No.MCC501-16IO2
BrandIXYS
SGD262.743
Each (In a Tray of 4)
units
985A SCR Module - 1600V - 16kA Panel Mount - 250mA - - 2.5V - 300mA
RS Stock No. 462-196
Mfr. Part No.MCC501-16io2
BrandIXYS
SGD320.67
Each
units
985A SCR Module - 1600V - 16kA Panel Mount - 250mA - - 2.5V - 300mA
RS Stock No. 296-3981
Mfr. Part No.SKPC200-440
BrandSemikron
SGD217.36
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 817-2406
Mfr. Part No.VS-25RIA80
BrandVishay
SGD18.96
Each
units
25A SCR TO-208AA 800V - 440A Thread Mount - 90mA - - 3V - 130mA
RS Stock No. 165-6020
Mfr. Part No.VS-25RIA80
BrandVishay
SGD17.62
Each (In a Bag of 100)
units
25A SCR TO-208AA 800V - 440A Thread Mount - 90mA - - 3V - 130mA
RS Stock No. 658-154
Mfr. Part No.SKPC100Z-440
BrandSemikron
SGD137.48
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 905-6239
Mfr. Part No.SKKT 570/16 E
BrandSemikron
SGD670.03
Each
units
570A SCR A 46 1600V - 1500A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 658-160
Mfr. Part No.SKPC100-440
BrandSemikron
SGD115.52
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 177-5203
Mfr. Part No.C106DG
BrandLittelfuse
SGD0.414
Each (In a Box of 500)
units
2.55A SCR TO-225AA 400V - 20A Through Hole - 500µA - - 1V - 6mA
RS Stock No. 194-265
Mfr. Part No.MCC312-16IO1
BrandIXYS
SGD203.34
Each
units
320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA
RS Stock No. 774-3467
Mfr. Part No.C106DG
BrandLittelfuse
SGD0.623
Each (In a Pack of 10)
units
2.55A SCR TO-225AA 400V - 20A Through Hole - 500µA - - 1V - 6mA
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