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
New
RS Stock No. 217-7227
Mfr. Part No.TT160N16SOFHPSA1
BrandInfineon
SGD64.40
Each
units
160A Diode - 1600V - - - - 145mA - - 2.5V - 200mA
RS Stock No. 145-8860
Mfr. Part No.TD570N16KOFHPSA2
BrandInfineon
SGD346.855
Each (In a Tray of 2)
units
600A PCT Module 60mm 1600V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 920-0883
Mfr. Part No.CS45-16IO1R
BrandIXYS
SGD8.912
Each (In a Tube of 30)
units
48A SCR ISOPLUS247 1600V - 560A Through Hole - 200mA - - 1.6V - 100mA
New
RS Stock No. 218-6331
Mfr. Part No.TD280N16SOFHPSA1
BrandInfineon
SGD130.19
Each
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280A - - 1600V - - - - 150mA - - 2V - 150mA
RS Stock No. 177-5210
Mfr. Part No.2N6405G
BrandLittelfuse
SGD1.265
Each (In a Box of 500)
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10A SCR TO-220AB 800V - 160A Through Hole - 60mA - - 2.5V - 60mA
RS Stock No. 202-5572
Mfr. Part No.TN2015H-6I
SGD1.348
Each (In a Tube of 50)
units
- - - - 20A - Surface Mount 12kW - - - - - -
RS Stock No. 165-5329
Mfr. Part No.TN2540-800G-TR
SGD1.936
Each (On a Reel of 1000)
units
16A SCR D2PAK (TO-263) 800V - 314A Surface Mount - 40mA - - 1.3V - 50mA
RS Stock No. 145-1770
Mfr. Part No.VS-70TPS16PBF
BrandVishay
SGD10.161
Each (In a Tube of 25)
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70A SCR Super-247 1600V - 1400A Through Hole - 100mA - - 1.5V - 200mA
RS Stock No. 905-6074
Mfr. Part No.SKT 16/16 E
BrandSemikron
SGD38.00
Each
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18A SCR A 46 1600V - 2000A Thread Mount - 150mA - - 3V - 250mA
RS Stock No. 905-6103
Mfr. Part No.SKKH 107/16 E
BrandSemikron
SGD94.33
Each
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119A SCR SEMIPACK1 1600V - 2250A Panel Mount - 100mA - - 2.5V - 250mA
RS Stock No. 708-4370
Mfr. Part No.VS-25TTS12S-M3
BrandVishay
SGD3.39
Each
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16A SCR D2PAK (TO-263) 1200V - 350A Surface Mount - 45mA - - 2V - 100mA
RS Stock No. 761-4003
Mfr. Part No.CS45-16io1R
BrandIXYS
SGD10.46
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48A SCR ISOPLUS247 1600V - 560A Through Hole - 200mA - - 1.6V - 100mA
RS Stock No. 489-3503
Mfr. Part No.PATFC
SGD18.34
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- - - - - - - - - - - - - -
RS Stock No. 165-5403
Mfr. Part No.TZ500N16KOFHPSA1
BrandInfineon
SGD283.767
Each (In a Tray of 3)
units
500A PCT Module 50mm 1600V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 135-8288
Mfr. Part No.MMO62-16io6
BrandIXYS
SGD30.86
Each
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30A SCR SOT-227B 1600V - 430A Surface Mount - 150mA - - 1.6V - 100mA
RS Stock No. 839-1313
Mfr. Part No.TZ425N16KOFHPSA1
BrandInfineon
SGD257.82
Each
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425A PCT BG-PB501-1 1600V - 14500A Panel Mount - 250mA - - 1.5V - 300mA
New
RS Stock No. 213-3436
Mfr. Part No.SV6025L2QTP
BrandLittelfuse
SGD4.148
Each (In a Pack of 5)
units
- SCR TO-220L 600V - - - - - - - - - -
RS Stock No. 839-1238
Mfr. Part No.TDB6HK95N16LOFHOSA1
BrandInfineon
SGD275.02
Each
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95A IGBT ISOPACK 1600V - 720A Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 878-1782
Mfr. Part No.L6008D8TP
BrandLittelfuse
SGD1.304
Each (In a Pack of 750)
units
8A - DPAK (TO-252) 600V - 85A Surface Mount - 10 mA, 20 mA - - 1.3V - 20mA
RS Stock No. 700-5620
Mfr. Part No.VS-P405W
BrandVishay
SGD68.46
Each
units
40A SCR Module PACE-PAK 1200V - 0.4kA Screw Mount - 60mA - - 2V - 130mA