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. 800-9200
Mfr. Part No.2N6509TG
BrandLittelfuse
£1.112
Each (In a Pack of 10)
Units
- SCR TO-220 800V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS Stock No. 545-0006
Mfr. Part No.2N6509G
BrandLittelfuse
£1.21
Each
Units
16A SCR TO-220AB 800V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS Stock No. 103-2940
Mfr. Part No.2N6509G
BrandLittelfuse
£1.112
Each (In a Box of 500)
Units
16A SCR TO-220AB 800V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS Stock No. 177-5179
Mfr. Part No.2N6509TG
BrandLittelfuse
£1.112
Each (In a Tube of 50)
Units
- SCR TO-220 800V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS Stock No. 625-4988
Mfr. Part No.C106D1G
BrandLittelfuse
£0.44
Each
Units
2.55A SCR TO-225 400V - 20A Through Hole - 0.2mA - - 0.8V - 3mA
RS Stock No. 177-5202
Mfr. Part No.C106MG
BrandLittelfuse
£0.231
Each (In a Box of 500)
Units
2.55A SCR TO-225AA 600V - 20A Through Hole - 500µA - - 1V - 6mA
RS Stock No. 774-3460
Mfr. Part No.C106MG
BrandLittelfuse
£0.368
Each (In a Pack of 10)
Units
2.55A SCR TO-225AA 600V - 20A Through Hole - 500µA - - 1V - 6mA
RS Stock No. 625-4994
Mfr. Part No.C106M1G
BrandLittelfuse
£0.46
Each
Units
2.55A SCR TO-225 600V - 20A Through Hole - 0.2mA - - 0.8V - 3mA
RS Stock No. 171-0024
Mfr. Part No.C106M1G
BrandLittelfuse
£0.232
Each (In a Box of 500)
Units
2.55A SCR TO-225 600V - 20A Through Hole - 0.2mA - - 0.8V - 3mA
RS Stock No. 774-3467
Mfr. Part No.C106DG
BrandLittelfuse
£0.368
Each (In a Pack of 10)
Units
2.55A SCR TO-225AA 400V - 20A Through Hole - 500µA - - 1V - 6mA
RS Stock No. 177-5203
Mfr. Part No.C106DG
BrandLittelfuse
£0.231
Each (In a Box of 500)
Units
2.55A SCR TO-225AA 400V - 20A Through Hole - 500µA - - 1V - 6mA
RS Stock No. 177-5210
Mfr. Part No.2N6405G
BrandLittelfuse
£0.616
Each (In a Box of 500)
Units
10A SCR TO-220AB 800V - 160A Through Hole - 60mA - - 2.5V - 60mA
RS Stock No. 862-4916
Mfr. Part No.2N6405G
BrandLittelfuse
£0.909
Each (In a Pack of 10)
Units
10A SCR TO-220AB 800V - 160A Through Hole - 60mA - - 2.5V - 60mA
RS Stock No. 103-2939
Mfr. Part No.2N6507G
BrandLittelfuse
£1.153
Each (In a Box of 500)
Units
16A SCR TO-220AB 400V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS Stock No. 544-9999
Mfr. Part No.2N6507G
BrandLittelfuse
£1.21
Each
Units
16A SCR TO-220AB 400V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS Stock No. 177-5212
Mfr. Part No.2N6508G
BrandLittelfuse
£1.112
Each (In a Box of 500)
Units
16A SCR TO-220AB 600V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS Stock No. 862-4929
Mfr. Part No.2N6508G
BrandLittelfuse
£1.161
Each (In a Pack of 10)
Units
16A SCR TO-220AB 600V - 250A Through Hole - 75mA - - 1.5V - 80mA
RS Stock No. 793-1920
Mfr. Part No.S6065KTP
BrandLittelfuse
£5.47
Each
Units
65A SCR TO-218AC 600V - 950A Through Hole - 50mA - - 2V - 80mA
RS Stock No. 178-7029
Mfr. Part No.S6065KTP
BrandLittelfuse
£3.719
Each (In a Tube of 250)
Units
65A SCR TO-218AC 600V - 950A Through Hole - 50mA - - 2V - 80mA
RS Stock No. 124-5420
Mfr. Part No.NYC0102BLT1G
BrandLittelfuse
£0.088
Each (On a Reel of 3000)
Units
0.25A SCR SOT-23 200V - 7A Surface Mount - 200µA - - 0.8V - 6mA