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. 168-8904
Mfr. Part No.TYN612RG
MYR4.255
Each (In a Tube of 50)
units
8A SCR TO-220AB 600V - 145A Through Hole - 200µA - - 0.8V - 5mA
RS Stock No. 877-3071
Mfr. Part No.TYN612RG
MYR5.691
Each (In a Pack of 10)
units
8A SCR TO-220AB 600V - 145A Through Hole - 200µA - - 0.8V - 5mA
RS Stock No. 168-6662
Mfr. Part No.TYN1225RG
MYR10.29
Each (In a Tube of 50)
units
16A SCR TO-220AB 1200V - 260A Through Hole - 40mA - - 1.5V - 50mA
RS Stock No. 355-2835
Mfr. Part No.TS420-600T
MYR5.30
Each
units
2.5A SCR TO-220AB 600V - 33A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 687-1000
Mfr. Part No.TYN1225RG
MYR12.09
Each
units
16A SCR TO-220AB 1200V - 260A Through Hole - 40mA - - 1.5V - 50mA
RS Stock No. 168-6080
Mfr. Part No.TS420-600T
MYR4.515
Each (In a Tube of 50)
units
2.5A SCR TO-220AB 600V - 33A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 168-7882
Mfr. Part No.BTW69-600RG
MYR24.35
Each (In a Tube of 30)
units
- SCR TOP3 - - - Through Hole - - - - - - -
RS Stock No. 810-7392
Mfr. Part No.BTW69-600RG
MYR28.59
Each
units
- SCR TOP3 - - - Through Hole - - - - - - -
RS Stock No. 810-3693
Mfr. Part No.TYN608RG
MYR4.946
Each (In a Pack of 10)
units
8A SCR TO-220AB 600V - 100A Through Hole - 15mA - - 1.3V - 30mA
RS Stock No. 168-7875
Mfr. Part No.TYN608RG
MYR4.549
Each (In a Tube of 50)
units
8A SCR TO-220AB 600V - 100A Through Hole - 15mA - - 1.3V - 30mA
RS Stock No. 188-8524
Mfr. Part No.TN2540-600G-TR
MYR9.996
Each (In a Pack of 5)
units
25A SCR D2PAK - - 314A Surface Mount - 40mA - - - - 50mA
RS Stock No. 203-3538
Mfr. Part No.X0115MUF
MYR1.58
Each (In a Pack of 25)
units
1A SCR SMB-FLAT-3 600V - 12A - - 0.15mA - - - - -
RS Stock No. 714-2647
Mfr. Part No.P0102DA 1AA3
MYR1.40
Each (In a Pack of 20)
units
0.5A SCR TO-92 400V - 8A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 102-3580
Mfr. Part No.BTW69-1200RG
MYR33.237
Each (In a Tube of 30)
units
32A SCR TOP3 1200V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS Stock No. 687-1003
Mfr. Part No.X0402NF 1AA2
MYR4.862
Each (In a Pack of 5)
units
0.9A SCR TO-202 800V - 33A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 102-4088
Mfr. Part No.TS820-600T
MYR5.429
Each (In a Tube of 50)
units
5A SCR TO-220AB 600V - 73A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 687-1038
Mfr. Part No.TYN812RG
MYR7.145
Each (In a Pack of 2)
units
8A SCR TO-220AB 800V - 145A Through Hole - 15mA - - 1.3V - 30mA
New
RS Stock No. 206-6077
Mfr. Part No.TN4050-12WL
MYR11.215
Each (In a Tube of 30)
units
25 SCR TO-247 1200V - 400A - - 50mA - - - - -
RS Stock No. 168-6654
Mfr. Part No.X0202MN 5BA4
MYR1.561
Each (On a Reel of 1000)
units
0.8A SCR SOT-223 600V - 25A Surface Mount - 0.2mA - - 0.8V - 5mA
RS Stock No. 202-5580
Mfr. Part No.TN3015H-6T
MYR4.72
Each (In a Pack of 10)
units
- - - - 30A - Surface Mount 18kW - - - - - -