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. 168-6662
Mfr. Part No.TYN1225RG
PHP125.166
Each (In a Tube of 50)
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16A SCR TO-220AB 1200V - 260A Through Hole - 40mA - - 1.5V - 50mA
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Mfr. Part No.TYN1225RG
PHP152.55
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16A SCR TO-220AB 1200V - 260A Through Hole - 40mA - - 1.5V - 50mA
RS Stock No. 862-4929
Mfr. Part No.2N6508G
BrandLittelfuse
PHP156.034
Each (In a Pack of 10)
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16A SCR TO-220AB 600V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS Stock No. 165-2391
Mfr. Part No.VS-50RIA120
BrandVishay
PHP941.98
Each (In a Bag of 100)
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50A SCR TO-65 1200V - 1490A Thread Mount - 100mA - - 2.5V - 200mA
RS Stock No. 395-3474
Mfr. Part No.VS-50RIA120
BrandVishay
PHP1,193.64
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50A SCR TO-65 1200V - 1490A Thread Mount - 100mA - - 2.5V - 200mA
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Mfr. Part No.2N6508G
BrandLittelfuse
PHP91.319
Each (In a Box of 500)
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16A SCR TO-220AB 600V - 250A Through Hole - 75mA - - 1.5V - 80mA
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Mfr. Part No.BT151-500R,127
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7.5A SCR TO-220AB 500V - 132A Through Hole - 15mA - - 1.5V - 20mA
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Mfr. Part No.SKT 1200/16 E
BrandSemikron
PHP17,137.55
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840A SCR B 14 1600V - 30000A Panel Mount - 250mA - - 3V - 500mA
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Mfr. Part No.BT151-500R,127
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1010A SCR Type G 1400V - 15000A Stud - 300mA - - 3V - 200mA
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Mfr. Part No.DCR1010G14
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1010A SCR Type G 1400V - 15000A Stud - 300mA - - 3V - 200mA
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- - - - - - Screw Mount - - 2500Vrms 230V ac - - -
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Mfr. Part No.SKKT 250/16E
BrandSemikron
PHP15,046.08
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190A SCR Module Y4 M6 1600V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
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64A SCR Module TO-240AA 800V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
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Mfr. Part No.TDB6HK95N16LOFHOSA1
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- SCR T 40 1600V - 370A Panel Mount - 100mA - - 2V - 150mA
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95A IGBT ISOPACK 1600V - 720A Panel Mount - 150mA - - 2.5V - 200mA