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. 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
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. 800-9200
Fabrikantnummer2N6509TG
FabrikantLittelfuse
1,234 €
Each (In a Pack of 10)
Aantal stuks
- SCR TO-220 800V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS-stocknr. 545-0006
Fabrikantnummer2N6509G
FabrikantLittelfuse
1,34 €
Each
Aantal stuks
16A SCR TO-220AB 800V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS-stocknr. 165-9921
FabrikantnummerS602TSRP
FabrikantLittelfuse
0,255 €
Each (On a Reel of 1000)
Aantal stuks
1.5A SCR SOT-223 600V - 15A Surface Mount - 200µA - - 0.8V - 5mA
RS-stocknr. 793-1926
FabrikantnummerS602TSRP
FabrikantLittelfuse
0,47 €
Each (In a Pack of 10)
Aantal stuks
1.5A SCR SOT-223 600V - 15A Surface Mount - 200µA - - 0.8V - 5mA
RS-stocknr. 177-5179
Fabrikantnummer2N6509TG
FabrikantLittelfuse
1,268 €
Each (In a Tube of 50)
Aantal stuks
- SCR TO-220 800V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS-stocknr. 625-4988
FabrikantnummerC106D1G
FabrikantLittelfuse
0,49 €
Each
Aantal stuks
2.55A SCR TO-225 400V - 20A Through Hole - 0.2mA - - 0.8V - 3mA
RS-stocknr. 103-2940
Fabrikantnummer2N6509G
FabrikantLittelfuse
1,183 €
Each (In a Box of 500)
Aantal stuks
16A SCR TO-220AB 800V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS-stocknr. 544-9999
Fabrikantnummer2N6507G
FabrikantLittelfuse
1,34 €
Each
Aantal stuks
16A SCR TO-220AB 400V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS-stocknr. 103-2939
Fabrikantnummer2N6507G
FabrikantLittelfuse
1,279 €
Each (In a Box of 500)
Aantal stuks
16A SCR TO-220AB 400V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS-stocknr. 878-1631
FabrikantnummerS8035KTP
FabrikantLittelfuse
2,951 €
Each (In a Pack of 250)
Aantal stuks
35A SCR TO-218AC 800V - 500A Through Hole - - - - 1.5V - 50mA
Nieuw
RS-stocknr. 213-3432
FabrikantnummerSV6020L1TP
FabrikantLittelfuse
1,916 €
Each (In a Tube of 50)
Aantal stuks
- SCR TO-220L 600V - - - - - - - - - -
RS-stocknr. 178-7030
FabrikantnummerS4065JTP
FabrikantLittelfuse
3,95 €
Each (In a Tube of 250)
Aantal stuks
65A SCR TO-218X 400V - 950A Through Hole - 50mA - - 2V - 80mA
Nieuw
RS-stocknr. 213-3437
FabrikantnummerSV6025L2TP
FabrikantLittelfuse
2,071 €
Each (In a Tube of 50)
Aantal stuks
- SCR TO-220L 600V - - - - - - - - - -
RS-stocknr. 792-5650
FabrikantnummerMCR08BT1G
FabrikantLittelfuse
0,324 €
Each (On a Tape of 10)
Aantal stuks
0.8A SCR SOT-223 200V - 8A Surface Mount - 200µA - - 0.8V - 5mA
RS-stocknr. 878-1845
FabrikantnummerS6S2RP
FabrikantLittelfuse
0,871 €
Each (In a Pack of 2500)
Aantal stuks
0.8A SCR Compak 600V - 20A Surface Mount - 50µA - - 0.8V - 5mA
Nieuw
RS-stocknr. 213-3414
FabrikantnummerLX807MBRP
FabrikantLittelfuse
0,463 €
Each (In a Pack of 25)
Aantal stuks
0.8A - SOT-89 400 → 600V - - - - 3mA - - - - -
Nieuw
RS-stocknr. 213-3434
FabrikantnummerSV6020L1TP
FabrikantLittelfuse
1,448 €
Each (In a Pack of 5)
Aantal stuks
- SCR TO-220L 600V - - - - - - - - - -
RS-stocknr. 121-7905
FabrikantnummerMCR708AT4G
FabrikantLittelfuse
0,375 €
Each (On a Reel of 2500)
Aantal stuks
- SCR DPAK (TO-252) 600V - 35A Surface Mount - 300µA - - 1V - 10mA