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. 262-488
Mfr. Part No.BT152-600R,127
MYR5.82
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
MYR4.574
Each (In a Tube of 50)
units
13A SCR TO-220AB 650V - 220A Through Hole - 32mA - - 1.5V - 60mA
RS Stock No. 905-6178
Mfr. Part No.SKT 1200/16 E
BrandSemikron
MYR1,486.92
Each
units
840A SCR B 14 1600V - 30000A Panel Mount - 250mA - - 3V - 500mA
RS Stock No. 146-1690
Mfr. Part No.MCC26-16IO1B
BrandIXYS
MYR111.338
Each (In a Box of 36)
units
32A SCR Module TO-240AA 1600V - 0.56kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 193-571
Mfr. Part No.MCC26-16IO1B
BrandIXYS
MYR138.82
Each
units
32A SCR Module TO-240AA 1600V - 0.56kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 395-9286
Mfr. Part No.VS-ST230S12P1VPBF
BrandVishay
MYR506.77
Each
units
230A SCR TO-93 1200V - 5970A Thread Mount - 150mA - - 3V - 600mA
RS Stock No. 165-2442
Mfr. Part No.VS-ST230S12P1VPBF
BrandVishay
MYR471.146
Each (In a Bag of 12)
units
230A SCR TO-93 1200V - 5970A Thread Mount - 150mA - - 3V - 600mA
RS Stock No. 489-3418
Mfr. Part No.AFM11
MYR565.91
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 177-5358
Mfr. Part No.MCC26-12IO1B
BrandIXYS
MYR98.997
Each (In a Box of 36)
units
32A SCR Module TO-240AA 1200V - 0.56kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 668-7004
Mfr. Part No.MCC26-12io1B
BrandIXYS
MYR83.92
Each
units
32A SCR Module TO-240AA 1200V - 0.56kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 905-6239
Mfr. Part No.SKKT 570/16 E
BrandSemikron
MYR4,017.50
Each
units
570A SCR A 46 1600V - 1500A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 436-8114
Mfr. Part No.BT152-800R,127
MYR5.52
Each (In a Pack of 5)
units
13A SCR TO-220AB 800V - 220A Through Hole - 32mA - - 1.5V - 60mA
RS Stock No. 193-717
Mfr. Part No.MCC95-16IO1B
BrandIXYS
MYR171.33
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
MYR153.164
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
MYR475.30
Each
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- - - - - - Screw Mount - - 3500Vrms 250V ac - - -
RS Stock No. 103-5680
Mfr. Part No.BT152-800R,127
MYR4.599
Each (In a Tube of 50)
units
13A SCR TO-220AB 800V - 220A Through Hole - 32mA - - 1.5V - 60mA
RS Stock No. 774-3460
Mfr. Part No.C106MG
BrandLittelfuse
MYR2.608
Each (In a Pack of 10)
units
2.55A SCR TO-225AA 600V - 20A Through Hole - 500µA - - 1V - 6mA
RS Stock No. 227-9214
Mfr. Part No.VS-ST230C16C0
BrandVishay
MYR362.07
Each
units
410A PCT TO-200AB 1600V - 5970A Screw Mount - 150mA - - 3V - 600mA
RS Stock No. 193-206
Mfr. Part No.VHF28-16IO5
BrandIXYS
MYR134.12
Each
units
32A SCR Module FO F A 1600V - 0.33kA Panel Mount - 65mA - - 1V - 100mA
RS Stock No. 165-2611
Mfr. Part No.VS-ST230C16C0
BrandVishay
MYR344.022
Each (In a Box of 12)
units
410A PCT TO-200AB 1600V - 5970A Screw Mount - 150mA - - 3V - 600mA