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. 284-4874
Mfr. Part No.SKKT 72/12 E
BrandSemikron
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Each
units
70A SCR Module SEMIPACK1 1200V - 1.6kA Panel Mount - 150mA - - 3V - 250mA
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Mfr. Part No.10RIA120
BrandVishay
MYR63.153
Each (In a Bag of 100)
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10A SCR TO-48 1200V - 240A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 168-4481
Mfr. Part No.MCC132-16IO1
BrandIXYS
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Each (In a Box of 6)
units
130A SCR Module Y4 M6 1600V - 5.08kA Panel Mount - 150mA - - 2.5V - 200mA
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Mfr. Part No.SKKT250/18E
BrandSemikron
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Each
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250A SCR Module SEMIPACK3 1800V - 9kA Panel Mount - 200mA - - 3V - 500mA
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Mfr. Part No.SKKH 92/16 E
BrandSemikron
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Each
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95A SCR Module SEMIPACK1 1600V - 2kA Panel Mount - 150mA - - 3V - 250mA
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BrandLittelfuse
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16A SCR TO-220AB 400V - 250A Through Hole - 30mA - - 1.5V - 40mA
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Mfr. Part No.VS-111RKI120PBF
BrandVishay
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110A PCT TO-94 1200V - 2180A Thread Mount - 120mA - - 2V - 200mA
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130A SCR Module Y4 M6 800V - 5.08kA Panel Mount - 150mA - - 2.5V - 200mA
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Mfr. Part No.VS-50RIA120
BrandVishay
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RS Stock No. 168-4595
Mfr. Part No.MCC132-08IO1
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Each (In a Box of 6)
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130A SCR Module Y4 M6 800V - 5.08kA Panel Mount - 150mA - - 2.5V - 200mA
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BrandVishay
MYR559.138
Each (In a Bag of 12)
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180A PCT TO-93 400V - 4000A Thread Mount - 150mA - - 2.5V - 600mA
RS Stock No. 918-9802
Mfr. Part No.VS-16TTS08-M3
BrandVishay
MYR16.52
Each (In a Tube of 50)
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10A SCR TO-220AB 800V - 200A Through Hole - 90mA - - 3V - 150mA
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BrandIXYS
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Each (In a Box of 36)
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116A SCR Module TO-240AA 1200V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
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64A SCR Module TO-240AA 1600V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
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BrandSemikron
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Each
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- - - - - - Screw Mount - - - - - - -
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8A SCR TO-220AB 600V - 100A Through Hole - 15mA - - 1.3V - 30mA
RS Stock No. 379-8025
Mfr. Part No.VS-T90RIA100
BrandVishay
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Each
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90A SCR D 55 1000V - 1870A Panel Mount - 120mA - - 2.5V - 200mA
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BrandVishay
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Each (In a Box of 10)
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105A SCR, SCR Module TO-240AA 1600V - 2000A Panel Mount - 270mA - - 4V - 250mA
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330A SCR TO-118 1200V - 9420A Stud - 200mA - - 3V - 600mA
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55A SCR Module INT-A-PAK 1600V - 0.41kA Panel Mount - 150mA - - 2.5V - 200mA