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. 296-3981
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.SKPC200-440
Brand :Semikron
THB5,177.70
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หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCO500-18IO1
Brand :IXYS
THB6,319.64
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560A SCR Module Y1 CU 1800V - 17kA Panel Mount - 300mA - - 2V - 300mA
RS Stock No. 145-8860
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TD570N16KOFHPSA2
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THB7,014.19
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600A PCT Module 60mm 1600V - 17000A Panel Mount - 250mA - - 2.2V - 300mA
RS Stock No. 232-9347
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THB10,382.87
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THB174.437
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THB1,669.82
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50A SCR Module SEMIPACK1 1200V - 1.5kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 168-4526
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560A SCR Module Y1 CU 1800V - 17kA Panel Mount - 300mA - - 2V - 300mA
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THB432.508
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19A SCR TOP3 1200V - 420A Through Hole - 50mA - - 1.5V - 75mA
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หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.MCC501-16IO2
Brand :IXYS
THB6,927.363
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985A SCR Module - 1600V - 16kA Panel Mount - 250mA - - 2.5V - 300mA
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THB11.701
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7.5A SCR TO-220AB 500V - 110A Through Hole - 15mA - - 1.5V - 20mA
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1.8A SCR TO-220AB 400V - 22A Through Hole - 1.5mA - - 3V - 175mA
RS Stock No. 877-6376
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.VS-VSKT56/12
Brand :Vishay
THB1,233.45
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60A SCR, SCR Module TO-240AA 1200V - 1200A Panel Mount - 270mA - - 4V - 200mA
RS Stock No. 468-1596
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THB2,534.77
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110A SCR Module INT-A-PAK 1600V - 1.18kA Panel Mount - 150mA - - 2.5V - 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
RS Stock No. 262-8391
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.SKKT 132/16 E
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THB4,056.40
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137A SCR Module SEMIPACK2 1600V - 4.7kA Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 687-1038
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8A SCR TO-220AB 800V - 145A Through Hole - 15mA - - 1.3V - 30mA
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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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THB1,207.899
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60A SCR, SCR Module TO-240AA 1200V - 1200A Panel Mount - 270mA - - 4V - 200mA
RS Stock No. 168-6672
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.TN22-1500T
THB42.33
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1.8A SCR TO-220AB 400V - 22A Through Hole - 1.5mA - - 3V - 175mA
RS Stock No. 195-4627
หมายเลขชิ้นส่วนของผู้ผลิต / Mfr. Part No.SKKT 106B12 E
Brand :Semikron
THB2,087.10
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106A SCR Module SEMIPACK1 1200V - 2.25kA Panel Mount - 150mA - - 3V - 250mA