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. 177-5361
Mfr. Part No.MCC95-12IO1B
BrandIXYS
HK$261.639
Each (In a Box of 36)
units
116A SCR Module TO-240AA 1200V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 687-1038
Mfr. Part No.TYN812RG
HK$13.66
Each (In a Pack of 2)
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8A SCR TO-220AB 800V - 145A Through Hole - 15mA - - 1.3V - 30mA
RS Stock No. 168-6663
Mfr. Part No.X0402NF 1AA2
HK$6.269
Each (In a Bag of 250)
units
0.9A SCR TO-202 800V - 33A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 165-6350
Mfr. Part No.VS-VSKT91/16
BrandVishay
HK$395.42
Each (In a Box of 10)
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95A SCR, SCR Module TO-240AA 1600V - 2000A Panel Mount - 270mA - - 4V - 250mA
RS Stock No. 171-0024
Mfr. Part No.C106M1G
BrandLittelfuse
HK$2.668
Each (In a Box of 500)
units
2.55A SCR TO-225 600V - 20A Through Hole - 0.2mA - - 0.8V - 3mA
New
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Mfr. Part No.TD160N16SOFHPSA1
BrandInfineon
HK$366.71
Each
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160A Diode - 1600V - - - - 145mA - - 2.5V - 200mA
RS Stock No. 918-9806
Mfr. Part No.VS-16TTS12S-M3
BrandVishay
HK$16.527
Each (In a Tube of 50)
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10A SCR D2PAK (TO-263) 1200V - 200A Surface Mount - 90mA - - 3V - 150mA
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BrandVishay
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Each (In a Box of 10)
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40A SCR Module PACE-PAK 600V - 0.4kA Screw Mount - 60mA - - 2V - 130mA
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BrandIXYS
HK$2,176.64
Each
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910A PCT N0910 2000V - 9200A Stud - 300mA - - 3V - 1000mA
RS Stock No. 135-8214
Mfr. Part No.CLA50E1200HB
BrandIXYS
HK$34.503
Each (In a Tube of 30)
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50A SCR TO-247 1200V - 700A Through Hole - 80mA - - 1.6V - 100mA
RS Stock No. 839-1253
Mfr. Part No.TT162N16KOFKHPSA1
BrandInfineon
HK$1,384.66
Each
units
162A PCT Module 34mm 1600V - 5200A Panel Mount - 150mA - - 2V - 200mA
RS Stock No. 177-5202
Mfr. Part No.C106MG
BrandLittelfuse
HK$3.098
Each (In a Box of 500)
units
2.55A SCR TO-225AA 600V - 20A Through Hole - 500µA - - 1V - 6mA
RS Stock No. 171-9491
Mfr. Part No.P0640SCLRP
BrandLittelfuse
HK$5.828
Each (On a Reel of 2500)
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500A SIDACtor DO-214AA - - 35A Surface Mount - 2.2mA - - 4V - 150mA
RS Stock No. 905-6087
Mfr. Part No.SKKT 42/12 E
BrandSemikron
HK$330.86
Each
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40A SCR SEMIPACK1 1200V - 1000A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 165-2662
Mfr. Part No.VS-25RIA120S90
BrandVishay
HK$157.059
Each (In a Bag of 100)
units
25A SCR TO-48 1200V - 440A Thread Mount - 60mA - - 2V - 130mA
RS Stock No. 169-5965
Mfr. Part No.VS-111MT160KPBF
BrandVishay
HK$796.057
Each (In a Bag of 15)
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110A SCR Module INT-A-PAK 1600V - 1.18kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 103-7558
Mfr. Part No.BT151-650R,127
HK$5.754
Each (In a Tube of 50)
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7.5A SCR TO-220AB 650V - 132A Through Hole - 15mA - - 1.5V - 20mA
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Mfr. Part No.BT152-800R,127
HK$11.056
Each (In a Pack of 5)
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13A SCR TO-220AB 800V - 220A Through Hole - 32mA - - 1.5V - 60mA
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Mfr. Part No.VS-ST180S12P1VPBF
BrandVishay
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Each (In a Bag of 12)
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200A SCR TO-93 1200V - 5230A Thread Mount - 150mA - - 3V - 600mA
RS Stock No. 178-1423
Mfr. Part No.BT151X-500R,127
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7.5A SCR TO-220F 500V - 110A Through Hole - 15mA - - 1.5V - 20mA