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. 145-9517
Mfr. Part No.TT330N16AOFHPSA1
BrandInfineon
$240.173
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330A PCT Module 50mm 1600V - 9100A Panel Mount - 200mA - - 2V - 300mA
RS Stock No. 839-1288
Mfr. Part No.TT330N16AOFHPSA1
BrandInfineon
$262.97
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330A PCT Module 50mm 1600V - 9100A Panel Mount - 200mA - - 2V - 300mA
RS Stock No. 165-5396
Mfr. Part No.TT162N16KOFAHPSA1
BrandInfineon
$200.814
Each (In a Tray of 8)
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162A PCT Module 34mm 1600V - 5200A Panel Mount - 150mA - - 2V - 200mA
RS Stock No. 839-1244
Mfr. Part No.TT162N16KOFAHPSA1
BrandInfineon
$239.10
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162A PCT Module 34mm 1600V - 5200A Panel Mount - 150mA - - 2V - 200mA
RS Stock No. 839-1253
Mfr. Part No.TT162N16KOFKHPSA1
BrandInfineon
$217.07
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162A PCT Module 34mm 1600V - 5200A Panel Mount - 150mA - - 2V - 200mA
RS Stock No. 839-1313
Mfr. Part No.TZ425N16KOFHPSA1
BrandInfineon
$230.24
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425A PCT BG-PB501-1 1600V - 14500A Panel Mount - 250mA - - 1.5V - 300mA
RS Stock No. 165-5397
Mfr. Part No.TT162N16KOFKHPSA1
BrandInfineon
$205.64
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162A PCT Module 34mm 1600V - 5200A Panel Mount - 150mA - - 2V - 200mA
RS Stock No. 165-5402
Mfr. Part No.TZ425N16KOFHPSA1
BrandInfineon
$230.553
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425A PCT BG-PB501-1 1600V - 14500A Panel Mount - 250mA - - 1.5V - 300mA
RS Stock No. 839-1272
Mfr. Part No.TT251N16KOFHPSA1
BrandInfineon
$237.67
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250A PCT Module 50mm 1600V - 9100A Panel Mount - 200mA - - 2V - 300mA
RS Stock No. 839-1304
Mfr. Part No.TT570N16KOFHPSA2
BrandInfineon
$397.76
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600A PCT Module 60mm 1600V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 165-5408
Mfr. Part No.TT500N12KOFHPSA2
BrandInfineon
$355.34
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500A PCT Module 60mm 1200V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 165-5337
Mfr. Part No.TDB6HK124N16RRBOSA1
BrandInfineon
$137.32
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125A Diode Module 45mm 1600V - 650A PCB Mount - 150mA - - 2.5V - 200mA
RS Stock No. 145-9518
Mfr. Part No.TZ600N12KOFHPSA1
BrandInfineon
$260.243
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600A PCT BG-PB501-1 1200V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 145-8864
Mfr. Part No.TT570N16KOFHPSA2
BrandInfineon
$379.01
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600A PCT Module 60mm 1600V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 839-1326
Mfr. Part No.TZ600N12KOFHPSA1
BrandInfineon
$273.13
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600A PCT BG-PB501-1 1200V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 839-1363
Mfr. Part No.T430N12TOFXPSA1
BrandInfineon
$123.84
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433A PCT BG-T4214K0-1 1200V - 5200A Stud - 200mA - - 2V - 300mA
RS Stock No. 839-1222
Mfr. Part No.TDB6HK124N16RRBOSA1
BrandInfineon
$143.25
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125A Diode Module 45mm 1600V - 650A PCB Mount - 150mA - - 2.5V - 200mA
RS Stock No. 839-1294
Mfr. Part No.TT500N12KOFHPSA2
BrandInfineon
$381.92
Each
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500A PCT Module 60mm 1200V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 145-8674
Mfr. Part No.TZ500N12KOFHPSA1
BrandInfineon
$246.00
Each (In a Tray of 3)
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500A PCT BG-PB501-1 1200V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 839-1317
Mfr. Part No.TZ500N12KOFHPSA1
BrandInfineon
$258.19
Each
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500A PCT BG-PB501-1 1200V - 17000A Panel Mount - 250mA - - 2.2V - 300mA