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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Omschrijving Prijs 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-stocknr. 905-6128
FabrikantnummerSKKT 92/16 E
FabrikantSemikron
92,01 €
Each
Aantal stuks
100A - A 10 1600V - 2500A Panel Mount - - - - - - -
RS-stocknr. 262-488
FabrikantnummerBT152-600R,127
1,03 €
Each
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13A SCR TO-220AB 650V - 220A Through Hole - 32mA - - 1.5V - 60mA
RS-stocknr. 167-320
FabrikantnummerVS-40TPS12-M3
FabrikantVishay
6,64 €
Each
Aantal stuks
35A SCR TO-247AC 1200V - 600A Through Hole - 150mA - - 2.5V - 150mA
RS-stocknr. 145-2566
FabrikantnummerVS-40TPS12-M3
FabrikantVishay
5,716 €
Each (In a Tube of 25)
Aantal stuks
35A SCR TO-247AC 1200V - 600A Through Hole - 150mA - - 2.5V - 150mA
RS-stocknr. 103-8143
FabrikantnummerBT152-600R,127
0,798 €
Each (In a Tube of 50)
Aantal stuks
13A SCR TO-220AB 650V - 220A Through Hole - 32mA - - 1.5V - 60mA
RS-stocknr. 905-6083
FabrikantnummerSKKT 27/16 E
FabrikantSemikron
71,97 €
Each
Aantal stuks
25A SCR A 46 1600V - 550A Panel Mount - 150mA - - 3V - 200mA
RS-stocknr. 905-6122
FabrikantnummerSKKT 106/16 E
FabrikantSemikron
48,29 €
Each
Aantal stuks
106A SCR A 46 1600V - 2250A Panel Mount - 150mA - - 3V - 250mA
RS-stocknr. 395-9315
FabrikantnummerVS-ST330S16P1PBF
FabrikantVishay
137,23 €
Each
Aantal stuks
330A SCR TO-118 1600V - 9420A Stud - 200mA - - 3V - 600mA
RS-stocknr. 197-810
FabrikantnummerCS45-16IO1
FabrikantIXYS
4,58 €
Each
Aantal stuks
48A SCR TO-247AD 1600V - 560A Through Hole - 100mA - - 1.5V - 100mA
RS-stocknr. 169-5961
FabrikantnummerST330S16P1PBF
FabrikantVishay
146,698 €
Each (In a Bag of 6)
Aantal stuks
330A SCR TO-118 1600V - 9420A Stud - 200mA - - 3V - 600mA
RS-stocknr. 177-5352
FabrikantnummerMCC95-16IO1B
FabrikantIXYS
26,063 €
Each (In a Box of 36)
Aantal stuks
116A SCR Module TO-240AA 1600V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS-stocknr. 468-2369
FabrikantnummerSKKH 106/16 E
FabrikantSemikron
200,48 €
Each
Aantal stuks
106A SCR Module SEMIPACK1 1600V - 2.25kA Panel Mount - 150mA - - 3V - 250mA
RS-stocknr. 395-9242
FabrikantnummerVS-ST110S16P1PBF
FabrikantVishay
72,37 €
Each
Aantal stuks
110A PCT TO-94 1600V - 2830A Thread Mount - 150mA - - 3V - 600mA
RS-stocknr. 920-0791
FabrikantnummerCS45-16IO1
FabrikantIXYS
3,781 €
Each (In a Tube of 30)
Aantal stuks
48A SCR TO-247AD 1600V - 560A Through Hole - 100mA - - 1.5V - 100mA
RS-stocknr. 489-3575
FabrikantnummerPR3-E-18KW
339,48 €
Each
Aantal stuks
- - - - 25A - Panel Mount 18kW - - - - - -
RS-stocknr. 193-717
FabrikantnummerMCC95-16IO1B
FabrikantIXYS
30,34 €
Each
Aantal stuks
116A SCR Module TO-240AA 1600V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS-stocknr. 905-6190
FabrikantnummerSKKT 162/22 E H4
FabrikantSemikron
152,75 €
Each
Aantal stuks
143A SCR SEMIPACK2 2200V - 5200A Panel Mount - 150mA - - 2V - 400mA
RS-stocknr. 169-5959
FabrikantnummerST110S16P1PBF
FabrikantVishay
66,254 €
Each (In a Bag of 25)
Aantal stuks
110A PCT TO-94 1600V - 2830A Thread Mount - 150mA - - 3V - 600mA
RS-stocknr. 165-9922
FabrikantnummerS8040R
FabrikantLittelfuse
1,864 €
Each (On a Reel of 500)
Aantal stuks
40A SCR TO-220AB 400V - 520A Through Hole - 40000µA - - 1.5V - 60mA
RS-stocknr. 793-1932
FabrikantnummerS8040R
FabrikantLittelfuse
3,15 €
Each (In a Pack of 5)
Aantal stuks
40A SCR TO-220AB 400V - 520A Through Hole - 40000µA - - 1.5V - 60mA