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. 355-2835
Mfr. Part No.TS420-600T
MYR5.30
Each
units
2.5A SCR TO-220AB 600V - 33A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 905-6128
Mfr. Part No.SKKT 92/16 E
BrandSemikron
MYR154.79
Each
units
100A - A 10 1600V - 2500A Panel Mount - - - - - - -
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. 509-566
Mfr. Part No.BT151-500R,127
MYR2.247
Each (In a Pack of 10)
units
7.5A SCR TO-220AB 500V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS Stock No. 919-4404
Mfr. Part No.VS-40TPS12A-M3
BrandVishay
MYR31.395
Each (In a Tube of 25)
units
35A SCR TO-247AC 1200V - 600A Through Hole - 40mA - - 2.5V - 150mA
RS Stock No. 625-4988
Mfr. Part No.C106D1G
BrandLittelfuse
MYR2.80
Each
units
2.55A SCR TO-225 400V - 20A Through Hole - 0.2mA - - 0.8V - 3mA
RS Stock No. 103-5140
Mfr. Part No.2N6404G
BrandLittelfuse
MYR3.331
Each (In a Box of 500)
units
10A SCR TO-220AB 600V - 160A Through Hole - 60mA - - 2.5V - 60mA
RS Stock No. 485-4283
Mfr. Part No.BT151-650R,127
MYR3.038
Each (In a Pack of 5)
units
7.5A SCR TO-220AB 650V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS Stock No. 505-3087
Mfr. Part No.SKKH162/18E
BrandSemikron
MYR334.26
Each
units
156A SCR Module SEMIPACK2 1800V - 5.4kA Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 301-619
Mfr. Part No.VS-40TPS12A-M3
BrandVishay
MYR43.20
Each
units
35A SCR TO-247AC 1200V - 600A Through Hole - 40mA - - 2.5V - 150mA
RS Stock No. 700-5636
Mfr. Part No.VS-ST230S08P0VPBF
BrandVishay
MYR505.18
Each
units
230A SCR TO-93 800V - 5970A Thread Mount - 150mA - - 3V - 600mA
RS Stock No. 168-4566
Mfr. Part No.CS60-16IO1
BrandIXYS
MYR36.908
Each (In a Tube of 30)
units
60A SCR PLUS247 1600V - 1.51kA Through Hole - 200mA - - 1.6V - 200mA
RS Stock No. 165-2846
Mfr. Part No.VS-ST230S08P0VPBF
BrandVishay
MYR316.61
Each (In a Bag of 12)
units
230A SCR TO-93 800V - 5970A Thread Mount - 150mA - - 3V - 600mA
RS Stock No. 169-5900
Mfr. Part No.VS-25RIA120M
BrandVishay
MYR69.615
Each (In a Bag of 100)
units
- - - - - - - - - - - - - -
RS Stock No. 168-9404
Mfr. Part No.BT151-500R,127
MYR2.247
Each (In a Tube of 50)
units
7.5A SCR TO-220AB 500V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS Stock No. 905-6119
Mfr. Part No.SKKH 72/16 E
BrandSemikron
MYR188.23
Each
units
70A SCR A 43a 1600V - 9000A Panel Mount - 150mA - - 2V - 500mA
RS Stock No. 357-3438
Mfr. Part No.VS-ST083S08PFM1P
BrandVishay
MYR504.83
Each
units
85A SCR TO-94 800V - 2560A Thread Mount - 200mA - - 3V - 600mA
RS Stock No. 165-2437
Mfr. Part No.VS-ST083S08PFM1P
BrandVishay
MYR331.529
Each (In a Bag of 25)
units
85A SCR TO-94 800V - 2560A Thread Mount - 200mA - - 3V - 600mA
RS Stock No. 103-2980
Mfr. Part No.C106D1G
BrandLittelfuse
MYR1.45
Each (In a Box of 500)
units
2.55A SCR TO-225 400V - 20A Through Hole - 0.2mA - - 0.8V - 3mA
RS Stock No. 145-1770
Mfr. Part No.VS-70TPS16PBF
BrandVishay
MYR28.108
Each (In a Tube of 25)
units
70A SCR Super-247 1600V - 1400A Through Hole - 100mA - - 1.5V - 200mA