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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รายละเอียดสินค้า / Description ราคา / 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. 687-1022
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.X0405MF 1AA2
THB19.638
Each: (In a Pack of 10)
Units
0.9A SCR TO-202 600V - 33A Through Hole - 0.05mA - - 0.8V - 5mA
RS Stock No. 145-9590
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.X0405MF 1AA2
THB17.441
Each (In a Bag of 250)
Units
0.9A SCR TO-202 600V - 33A Through Hole - 0.05mA - - 0.8V - 5mA
RS Stock No. 829-0683
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BTW68-1200RG
THB246.40
Each
Units
19A SCR TOP3 1200V - 420A Through Hole - 50mA - - 1.5V - 75mA
RS Stock No. 810-7392
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BTW69-600RG
THB204.88
Each
Units
- SCR TOP3 - - - Through Hole - - - - - - -
RS Stock No. 168-7882
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BTW69-600RG
THB174.437
Each (In a Tube of 30)
Units
- SCR TOP3 - - - Through Hole - - - - - - -
RS Stock No. 178-1397
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BTW68-1200RG
THB432.508
Each (In a Tube of 30)
Units
19A SCR TOP3 1200V - 420A Through Hole - 50mA - - 1.5V - 75mA
RS Stock No. 877-3046
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TN2540-800G-TR
THB87.18
Each: (In a Pack of 5)
Units
16A SCR D2PAK (TO-263) 800V - 314A Surface Mount - 40mA - - 1.3V - 50mA
RS Stock No. 687-1038
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TYN812RG
THB38.81
Each: (In a Pack of 2)
Units
8A SCR TO-220AB 800V - 145A Through Hole - 15mA - - 1.3V - 30mA
RS Stock No. 168-6672
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TN22-1500T
THB42.33
Each (In a Tube of 50)
Units
1.8A SCR TO-220AB 400V - 22A Through Hole - 1.5mA - - 3V - 175mA
RS Stock No. 168-6670
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TYN812RG
THB41.279
Each (In a Tube of 50)
Units
8A SCR TO-220AB 800V - 145A Through Hole - 15mA - - 1.3V - 30mA
RS Stock No. 165-5329
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TN2540-800G-TR
THB41.412
Each (On a Reel of 1000)
Units
16A SCR D2PAK (TO-263) 800V - 314A Surface Mount - 40mA - - 1.3V - 50mA
RS Stock No. 687-1050
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TN22-1500T
THB40.864
Each: (In a Pack of 5)
Units
1.8A SCR TO-220AB 400V - 22A Through Hole - 1.5mA - - 3V - 175mA
RS Stock No. 102-3581
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BTW69-800RG
THB207.386
Each (In a Tube of 30)
Units
32A SCR TOP3 800V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS Stock No. 168-6654
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.X0202MN 5BA4
THB9.43
Each (On a Reel of 1000)
Units
0.8A SCR SOT-223 600V - 25A Surface Mount - 0.2mA - - 0.8V - 5mA
RS Stock No. 687-0962
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.X0202MN 5BA4
THB13.15
Each: (In a Pack of 5)
Units
0.8A SCR SOT-223 600V - 25A Surface Mount - 0.2mA - - 0.8V - 5mA
RS Stock No. 714-2643
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BTW69-800RG
THB218.12
Each
Units
32A SCR TOP3 800V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS Stock No. 714-2640
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BTW69-1200RG
THB234.92
Each
Units
32A SCR TOP3 1200V - 610A Through Hole - 80mA - - 1.3V - 150mA
RS Stock No. 687-1013
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.X0402MF 1AA2
THB21.05
Each: (In a Pack of 10)
Units
0.9A SCR TO-202 600V - 33A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 687-0969
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.P0102DN 5AA4
THB21.474
Each: (In a Pack of 5)
Units
0.5A SCR SOT-223 400V - 8A Surface Mount - 0.2mA - - 0.8V - 5mA
RS Stock No. 188-8303
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TN1625-1000G-TR
THB35.159
Each (On a Reel of 1000)
Units
16A SCR D2PAK - - 200A Surface Mount - - - - - - 40mA