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. 493-077
Mfr. Part No.PR1-DIN-2.5KW
€75.57
Each
units
- - - - 11A - DIN Rail 2.5kW - - - - - -
RS Stock No. 214-3979
Mfr. Part No.ZVS-16DV
€65.90
Each
units
- - - - 16A - Screw Mount 3.7kW - - - - - -
RS Stock No. 669-6020
Mfr. Part No.DMFC12 230VAC
€94.03
Each
units
- - - - - - DIN Rail - - - 24V ac - 24V dc -
RS Stock No. 167-320
Mfr. Part No.VS-40TPS12-M3
BrandVishay
€7.86
Each
units
35A SCR TO-247AC 1200V - 600A Through Hole - 150mA - - 2.5V - 150mA
RS Stock No. 145-2566
Mfr. Part No.VS-40TPS12-M3
BrandVishay
€5.356
Each (In a Tube of 25)
units
35A SCR TO-247AC 1200V - 600A Through Hole - 150mA - - 2.5V - 150mA
RS Stock No. 177-5179
Mfr. Part No.2N6509TG
BrandLittelfuse
€1.268
Each (In a Tube of 50)
units
- SCR TO-220 800V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS Stock No. 355-2841
Mfr. Part No.TS820-600T
€1.24
Each
units
5A SCR TO-220AB 600V - 73A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 800-9200
Mfr. Part No.2N6509TG
BrandLittelfuse
€1.234
Each (In a Pack of 10)
units
- SCR TO-220 800V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS Stock No. 103-2940
Mfr. Part No.2N6509G
BrandLittelfuse
€1.183
Each (In a Box of 500)
units
16A SCR TO-220AB 800V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS Stock No. 102-4088
Mfr. Part No.TS820-600T
€1.05
Each (In a Tube of 50)
units
5A SCR TO-220AB 600V - 73A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 545-0006
Mfr. Part No.2N6509G
BrandLittelfuse
€1.34
Each
units
16A SCR TO-220AB 800V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS Stock No. 841-930
Mfr. Part No.TPSR-25
€41.38
Each
units
- - - - - - - - - - - - - -
RS Stock No. 193-694
Mfr. Part No.MCC56-16IO1B
BrandIXYS
€22.42
Each
units
64A SCR Module TO-240AA 1600V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 232-9369
Mfr. Part No.FC11BL/2
€107.61
Each
units
- - - - - - - - - - - - - -
RS Stock No. 457-4195
Mfr. Part No.EVR-25BF
€200.64
Each
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- - - - - - - - - - - - - -
RS Stock No. 146-1691
Mfr. Part No.MCC56-16IO1B
BrandIXYS
€19.734
Each (In a Box of 36)
units
64A SCR Module TO-240AA 1600V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 829-6858
Mfr. Part No.BTW69-1200N
€5.17
Each
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31A SCR TOP3 1200V - 763A Through Hole - 50mA - - 1.3V - 100mA
RS Stock No. 195-4649
Mfr. Part No.SKKT 162/16 E
BrandSemikron
€150.35
Each
units
156A SCR Module SEMIPACK2 1600V - 5.4kA Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 214-3957
Mfr. Part No.QLC-TB-RFI
€68.46
Each
units
- - - - - - - - - - - - - -
RS Stock No. 165-5771
Mfr. Part No.BTW69-1200N
€3.422
Each (In a Tube of 30)
units
31A SCR TOP3 1200V - 763A Through Hole - 50mA - - 1.3V - 100mA