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. 165-5329
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TN2540-800G-TR
THB41.412
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16A SCR D2PAK (TO-263) 800V - 314A Surface Mount - 40mA - - 1.3V - 50mA
RS Stock No. 103-7543
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.BT151-800R,127
THB20.864
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7.5A SCR TO-220AB 800V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS Stock No. 876-8509
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.S6008LS3
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THB47.84
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8A SCR TO-220 600V - 100A Through Hole - 500µA - - 0.8V - 8mA
RS Stock No. 905-6116
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.SKKT 92/12 E
Brand :Semikron
THB1,804.20
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106A SCR A 46 1200V - 2250A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 227-9208
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.VS-ST230C12C0
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THB2,098.29
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410A PCT TO-200AB 1200V - 5970A Screw Mount - 150mA - - 3V - 600mA
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THB5,582.86
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320A SCR A 43a 1600V - 9500A Panel Mount - 150mA - - 2V - 500mA
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162A PCT Module 34mm 1600V - 5200A Panel Mount - 150mA - - 2V - 200mA
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THB1,892.095
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190A SCR Module Y4 M6 1600V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 169-5842
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THB1,993.509
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410A PCT TO-200AB 1200V - 5970A Screw Mount - 150mA - - 3V - 600mA
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- - - - - - - - - - - - - -
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THB1,996.37
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95A SCR Module SEMIPACK1 1600V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 700-5037
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THB1,526.32
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60A SCR TO-240AA 1200V - 1.2kA Panel Mount - 270mA - - 4V - 200mA
RS Stock No. 165-2988
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THB1,142.591
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60A SCR TO-240AA 1200V - 1.2kA Panel Mount - 270mA - - 4V - 200mA
RS Stock No. 839-1253
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TT162N16KOFKHPSA1
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THB5,698.26
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162A PCT Module 34mm 1600V - 5200A Panel Mount - 150mA - - 2V - 200mA
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THB39.49
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12A SCR TO-220 800V - 130A Through Hole - 20mA - - 1.5V - 40mA
RS Stock No. 214-4269
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95A Diode, SCR SEMIPACK1 1200V - 2kA Panel Mount - 150mA - - 3V - 250mA
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THB41.279
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8A SCR TO-220AB 800V - 145A Through Hole - 15mA - - 1.3V - 30mA
RS Stock No. 687-1050
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THB40.864
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1.8A SCR TO-220AB 400V - 22A Through Hole - 1.5mA - - 3V - 175mA
RS Stock No. 194-041
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Brand :IXYS
THB1,934.84
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190A SCR Module Y4 M6 1600V - 6.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 687-1038
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THB38.81
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8A SCR TO-220AB 800V - 145A Through Hole - 15mA - - 1.3V - 30mA