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 used in 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. 658-148
Mfr. Part No.SKPC200-240
BrandSemikron
SGD460.44
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 905-6178
Mfr. Part No.SKT 1200/16 E
BrandSemikron
SGD441.56
Each
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840A SCR B 14 1600V - 30000A Panel Mount - 250mA - - 3V - 500mA
RS Stock No. 468-2369
Mfr. Part No.SKKH 106/16 E
BrandSemikron
SGD70.40
Each
units
106A SCR Module SEMIPACK1 1600V - 2.25kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 658-154
Mfr. Part No.SKPC100Z-440
BrandSemikron
SGD137.48
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 296-3981
Mfr. Part No.SKPC200-440
BrandSemikron
SGD217.36
Each
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- - - - - - Screw Mount - - - - - - -
RS Stock No. 905-6239
Mfr. Part No.SKKT 570/16 E
BrandSemikron
SGD670.03
Each
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570A SCR A 46 1600V - 1500A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 658-160
Mfr. Part No.SKPC100-440
BrandSemikron
SGD115.52
Each
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- - - - - - Screw Mount - - - - - - -
RS Stock No. 905-6122
Mfr. Part No.SKKT 106/16 E
BrandSemikron
SGD40.14
Each
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106A SCR A 46 1600V - 2250A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 905-6190
Mfr. Part No.SKKT 162/22 E H4
BrandSemikron
SGD258.77
Each
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143A SCR SEMIPACK2 2200V - 5200A Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 183-2268
Mfr. Part No.SKCH 28/12
BrandSemikron
SGD68.58
Each
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30A SCR Module SEMIPONT®1 1200V - 0.32kA Screw Mount - 100mA - - 2V - 150mA
RS Stock No. 214-4253
Mfr. Part No.SKKH 92/08 E
BrandSemikron
SGD122.58
Each
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95A SCR Module SEMIPACK1 800V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 468-2353
Mfr. Part No.SKKH 106/12 E
BrandSemikron
SGD69.16
Each
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106A SCR Module SEMIPACK1 1200V - 2.25kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 905-6099
Mfr. Part No.SKKT 42/16 E
BrandSemikron
SGD36.15
Each
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40A SCR A 46 1600V - 1000A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 905-6128
Mfr. Part No.SKKT 92/16 E
BrandSemikron
SGD43.65
Each
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100A - A 10 1600V - 2500A Panel Mount - - - - - - -
RS Stock No. 905-6043
Mfr. Part No.SK 100 KQ 16
BrandSemikron
SGD64.98
Each
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18A SCR B 2 1600V - 370A Thread Mount - 100mA - - 3V - 150mA
RS Stock No. 905-6119
Mfr. Part No.SKKH 72/16 E
BrandSemikron
SGD54.68
Each
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70A SCR A 43a 1600V - 9000A Panel Mount - 150mA - - 2V - 500mA
RS Stock No. 158-9087
Mfr. Part No.SKKT 92B12 E
BrandSemikron
SGD86.87
Each
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95A SCR Module SEMIPACK1 1200V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 262-8335
Mfr. Part No.SKKH 92/16 E
BrandSemikron
SGD52.11
Each
units
95A SCR Module SEMIPACK1 1600V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 195-4633
Mfr. Part No.SKKT 106B16 E
BrandSemikron
SGD73.53
Each
units
106A SCR Module SEMIPACK1 1600V - 2.25kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 195-4611
Mfr. Part No.SKKT 42B16 E
BrandSemikron
SGD62.02
Each
units
40A SCR Module SEMIPACK1 1600V - 1kA Panel Mount - 150mA - - 3V - 250mA