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. 668-7013
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BrandIXYS
HK$215.01
Each
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64A SCR Module TO-240AA 800V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 168-8062
Mfr. Part No.TS1220-600B
HK$12.401
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8A SCR DPAK (TO-252) 700V - - Surface Mount - 200µA - - 0.8V - 5mA
New
RS Stock No. 217-7218
Mfr. Part No.TD390N16SOFHPSA1
BrandInfineon
HK$650.36
Each (In a Tray of 3)
units
380A Diode - 1600V - - - - 150mA - - 2V - 150mA
RS Stock No. 505-3087
Mfr. Part No.SKKH162/18E
BrandSemikron
HK$661.27
Each
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156A SCR Module SEMIPACK2 1800V - 5.4kA Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 206-6082
Mfr. Part No.TN6050HP-12WY
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38 SCR TO-247 1200V - 600A - - 50mA - - - - -
RS Stock No. 165-5529
Mfr. Part No.TS820-600B-TR
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5A SCR DPAK (TO-252) 600V - 73A Surface Mount - 200µA - - 0.8V - 5mA
RS Stock No. 708-4370
Mfr. Part No.VS-25TTS12S-M3
BrandVishay
HK$18.42
Each
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16A SCR D2PAK (TO-263) 1200V - 350A Surface Mount - 45mA - - 2V - 100mA
RS Stock No. 700-5068
Mfr. Part No.VS-VSKT162/16PBF
BrandVishay
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160A SCR INT-A-PAK 1600V - 5.1kA Panel Mount - 270mA - - 4V - 200mA
RS Stock No. 145-9515
Mfr. Part No.TD330N16AOFHPSA1
BrandInfineon
HK$1,492.897
Each (In a Tray of 3)
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330A PCT Module 50mm 1600V - 9100A Panel Mount - 200mA - - 2V - 300mA
New
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Mfr. Part No.A437532
HK$3,310.90
Each
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- - - - 50A - - - - - - - - -
RS Stock No. 168-6278
Mfr. Part No.P0111MN 5AA4
HK$3.455
Each (On a Reel of 1000)
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0.5A SCR SOT-223 600V - 8A Surface Mount - 0.025mA - - 0.8V - 5mA
RS Stock No. 839-1228
Mfr. Part No.TD570N16KOFHPSA2
BrandInfineon
HK$1,941.16
Each
units
600A PCT Module 60mm 1600V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 668-7038
Mfr. Part No.MCC162-12io1
BrandIXYS
HK$483.04
Each
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190A SCR Module Y4 M6 1200V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 165-6811
Mfr. Part No.X0202MA 1BA2
HK$2.279
Each (On a Reel of 2500)
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1.25A SCR TO-92 600V - 25A Through Hole - 200µA - - 0.8V - 5mA
New
RS Stock No. 217-7239
Mfr. Part No.TT390N18SOFHPSA1
BrandInfineon
HK$880.81
Each
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380A Diode - 1800V - - - - 150mA - - 2V - 150mA
RS Stock No. 123-1455
Mfr. Part No.FS0103MA
HK$0.759
Each (In a Pack of 100)
units
0.8A SCR TO-92 600V - 7A Through Hole - 200µA - - 0.8V - 5mA
RS Stock No. 165-5402
Mfr. Part No.TZ425N16KOFHPSA1
BrandInfineon
HK$1,463.27
Each (In a Tray of 3)
units
425A PCT BG-PB501-1 1600V - 14500A Panel Mount - 250mA - - 1.5V - 300mA
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Mfr. Part No.VS-VSKT136/12PBF
BrandVishay
HK$735.01
Each
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135A IGBT INT-A-PAK 1200V - 3.36kA Panel Mount - 270mA - - 4V - 200mA
RS Stock No. 171-0024
Mfr. Part No.C106M1G
BrandLittelfuse
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Each (In a Box of 500)
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2.55A SCR TO-225 600V - 20A Through Hole - 0.2mA - - 0.8V - 3mA
RS Stock No. 905-6074
Mfr. Part No.SKT 16/16 E
BrandSemikron
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18A SCR A 46 1600V - 2000A Thread Mount - 150mA - - 3V - 250mA