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. 810-7392
Mfr. Part No.BTW69-600RG
SGD10.14
Each
units
- SCR TOP3 - - - Through Hole - - - - - - -
RS Stock No. 168-7882
Mfr. Part No.BTW69-600RG
SGD8.642
Each (In a Tube of 30)
units
- SCR TOP3 - - - Through Hole - - - - - - -
RS Stock No. 829-0469
Mfr. Part No.TXN625RG
SGD4.558
Each (In a Pack of 5)
units
16A SCR TO-220AB 600V - 314A Through Hole - 40mA - - 1.3V - 50mA
RS Stock No. 168-8046
Mfr. Part No.TXN625RG
SGD3.875
Each (In a Tube of 50)
units
16A SCR TO-220AB 600V - 314A Through Hole - 40mA - - 1.3V - 50mA
RS Stock No. 102-4088
Mfr. Part No.TS820-600T
SGD1.932
Each (In a Tube of 50)
units
5A SCR TO-220AB 600V - 73A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 355-2841
Mfr. Part No.TS820-600T
SGD2.26
Each
units
5A SCR TO-220AB 600V - 73A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 829-0683
Mfr. Part No.BTW68-1200RG
SGD10.23
Each
units
19A SCR TOP3 1200V - 420A Through Hole - 50mA - - 1.5V - 75mA
RS Stock No. 877-2655
Mfr. Part No.BTW67-1000
SGD12.17
Each
units
32A SCR RD91 1000V - 610A Panel Mount - 80mA - - 1.3V - 150mA
RS Stock No. 714-2643
Mfr. Part No.BTW69-800RG
SGD10.68
Each
units
32A SCR TOP3 800V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS Stock No. 687-1022
Mfr. Part No.X0405MF 1AA2
SGD1.078
Each (In a Pack of 10)
units
0.9A SCR TO-202 600V - 33A Through Hole - 0.05mA - - 0.8V - 5mA
RS Stock No. 145-9467
Mfr. Part No.X0403MF 1AA2
SGD0.983
Each (In a Bag of 250)
units
4A SCR TO-202 600V - 33A Through Hole - - - - 0.8V - 5mA
RS Stock No. 795-9110
Mfr. Part No.X0403MF 1AA2
SGD1.403
Each (In a Pack of 10)
units
4A SCR TO-202 600V - 33A Through Hole - - - - 0.8V - 5mA
RS Stock No. 102-3581
Mfr. Part No.BTW69-800RG
SGD10.269
Each (In a Tube of 30)
units
32A SCR TOP3 800V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS Stock No. 178-1397
Mfr. Part No.BTW68-1200RG
SGD9.581
Each (In a Tube of 30)
units
19A SCR TOP3 1200V - 420A Through Hole - 50mA - - 1.5V - 75mA
RS Stock No. 145-9590
Mfr. Part No.X0405MF 1AA2
SGD0.864
Each (In a Bag of 250)
units
0.9A SCR TO-202 600V - 33A Through Hole - 0.05mA - - 0.8V - 5mA
RS Stock No. 168-6278
Mfr. Part No.P0111MN 5AA4
SGD0.562
Each (On a Reel of 1000)
units
0.5A SCR SOT-223 600V - 8A Surface Mount - 0.025mA - - 0.8V - 5mA
RS Stock No. 145-8883
Mfr. Part No.BTW67-1000
SGD10.479
Each (In a Bag of 50)
units
32A SCR RD91 1000V - 610A Panel Mount - 80mA - - 1.3V - 150mA
RS Stock No. 486-5485
Mfr. Part No.P0111MN 5AA4
SGD1.396
Each (In a Pack of 5)
units
0.5A SCR SOT-223 600V - 8A Surface Mount - 0.025mA - - 0.8V - 5mA
RS Stock No. 714-2640
Mfr. Part No.BTW69-1200RG
SGD11.47
Each
units
32A SCR TOP3 1200V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS Stock No. 687-1013
Mfr. Part No.X0402MF 1AA2
SGD1.24
Each (In a Pack of 10)
units
0.9A SCR TO-202 600V - 33A Through Hole - 0.2mA - - 0.8V - 5mA