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. 485-4299
Mfr. Part No.BT169G,112
MYR0.985
Each (In a Pack of 25)
units
0.5A SCR SPT 600V - 9A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 195-4649
Mfr. Part No.SKKT 162/16 E
BrandSemikron
MYR252.64
Each
units
156A SCR Module SEMIPACK2 1600V - 5.4kA Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 165-5408
Mfr. Part No.TT500N12KOFHPSA2
BrandInfineon
MYR1,253.53
Each (In a Tray of 2)
units
500A PCT Module 60mm 1200V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 700-5554
Mfr. Part No.VS-110RKI120PBF
BrandVishay
MYR239.49
Each
units
110A PCT TO-94 1200V - 2180A Thread Mount - 120mA - - 2V - 200mA
RS Stock No. 214-4269
Mfr. Part No.SKKH 92/12 E
BrandSemikron
MYR209.17
Each
units
95A Diode, SCR SEMIPACK1 1200V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 905-6162
Mfr. Part No.SKT 551/16 E
BrandSemikron
MYR894.68
Each
units
391A SCR B 11 1600V - 9000A Panel Mount - 250mA - - 3V - 500mA
RS Stock No. 659-680
Mfr. Part No.SKKT 162/12 E
BrandSemikron
MYR209.47
Each
units
156A SCR Module SEMIPACK2 1200V - 5.4kA Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 839-1294
Mfr. Part No.TT500N12KOFHPSA2
BrandInfineon
MYR1,253.48
Each
units
500A PCT Module 60mm 1200V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 145-8864
Mfr. Part No.TT570N16KOFHPSA2
BrandInfineon
MYR1,337.025
Each (In a Tray of 2)
units
600A PCT Module 60mm 1600V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 905-6122
Mfr. Part No.SKKT 106/16 E
BrandSemikron
MYR622.63
Each
units
106A SCR A 46 1600V - 2250A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 165-2886
Mfr. Part No.VS-110RKI120PBF
BrandVishay
MYR179.166
Each (In a Bag of 25)
units
110A PCT TO-94 1200V - 2180A Thread Mount - 120mA - - 2V - 200mA
RS Stock No. 839-1304
Mfr. Part No.TT570N16KOFHPSA2
BrandInfineon
MYR1,336.97
Each
units
600A PCT Module 60mm 1600V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 545-0006
Mfr. Part No.2N6509G
BrandLittelfuse
MYR8.01
Each
units
16A SCR TO-220AB 800V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS Stock No. 165-2662
Mfr. Part No.VS-25RIA120S90
BrandVishay
MYR81.562
Each (In a Bag of 100)
units
25A SCR TO-48 1200V - 440A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 700-5585
Mfr. Part No.VS-25RIA120S90
BrandVishay
MYR93.78
Each
units
25A SCR TO-48 1200V - 440A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 165-5407
Mfr. Part No.TT425N16KOFHPSA3
BrandInfineon
MYR1,204.055
Each (In a Tray of 2)
units
471A PCT Module 60mm 1600V - 14500A Panel Mount - 250mA - - 1.5V - 300mA
RS Stock No. 169-5956
Mfr. Part No.T70RIA120
BrandVishay
MYR132.874
Each (In a Box of 10)
units
70A SCR D 55 1200V - 1740A Panel Mount - 120mA - - 2.5V - 200mA
RS Stock No. 177-5179
Mfr. Part No.2N6509TG
BrandLittelfuse
MYR7.199
Each (In a Tube of 50)
units
- SCR TO-220 800V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS Stock No. 165-2948
Mfr. Part No.VS-P405W
BrandVishay
MYR156.599
Each (In a Box of 10)
units
40A SCR Module PACE-PAK 1200V - 0.4kA Screw Mount - 60mA - - 2V - 130mA
RS Stock No. 195-3494
Mfr. Part No.AVR-25
MYR729.51
Each
units
- - - - - - Screw Mount - - 2500Vrms 230V ac - - -