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

...
Read more Read less

Filters

Viewing 1 - 20 of 65 products
Results per page
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. 905-6128
Mfr. Part No.SKKT 92/16 E
BrandSemikron
$126.73
Each
units
100A - A 10 1600V - 2500A Panel Mount - - - - - - -
RS Stock No. 658-148
Mfr. Part No.SKPC200-240
BrandSemikron
$671.37
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 905-6083
Mfr. Part No.SKKT 27/16 E
BrandSemikron
$106.24
Each
units
25A SCR A 46 1600V - 550A Panel Mount - 150mA - - 3V - 200mA
RS Stock No. 905-6122
Mfr. Part No.SKKT 106/16 E
BrandSemikron
$202.73
Each
units
106A SCR A 46 1600V - 2250A Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 195-4649
Mfr. Part No.SKKT 162/16 E
BrandSemikron
$223.79
Each
units
156A SCR Module SEMIPACK2 1600V - 5.4kA Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 905-6153
Mfr. Part No.SKKH 132/18 E
BrandSemikron
$115.05
Each
units
129A SCR A 21 1800V - 3600A Panel Mount - 150mA - - 2V - 300mA
RS Stock No. 158-9037
Mfr. Part No.SKKT 42B12 E
BrandSemikron
$74.87
Each
units
40A SCR Module SEMIPACK1 1200V - 1kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 905-6204
Mfr. Part No.SKKT 250/16E
BrandSemikron
$450.27
Each
units
250A SCR A 73b 1600V - 9000A Panel Mount - 200mA - - 3V - 500mA
RS Stock No. 905-6043
Mfr. Part No.SK 100 KQ 16
BrandSemikron
$78.77
Each
units
18A SCR B 2 1600V - 370A Thread Mount - 100mA - - 3V - 150mA
RS Stock No. 905-6074
Mfr. Part No.SKT 16/16 E
BrandSemikron
$51.61
Each
units
18A SCR A 46 1600V - 2000A Thread Mount - 150mA - - 3V - 250mA
RS Stock No. 905-6103
Mfr. Part No.SKKH 107/16 E
BrandSemikron
$74.98
Each
units
119A SCR SEMIPACK1 1600V - 2250A Panel Mount - 100mA - - 2.5V - 250mA
RS Stock No. 905-6134
Mfr. Part No.SKKT 106/18 E
BrandSemikron
$190.77
Each
units
600A - A 42 1800V - 22000A Panel Mount - - - - - - -
RS Stock No. 658-160
Mfr. Part No.SKPC100-440
BrandSemikron
$138.11
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 905-6162
Mfr. Part No.SKT 551/16 E
BrandSemikron
$401.50
Each
units
391A SCR B 11 1600V - 9000A Panel Mount - 250mA - - 3V - 500mA
RS Stock No. 905-6046
Mfr. Part No.SKT 24/16 E
BrandSemikron
$40.50
Each
units
22A SCR - 1600V - 450A Thread Mount - 100A - - 3V - 150mA
RS Stock No. 296-3981
Mfr. Part No.SKPC200-440
BrandSemikron
$379.74
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 262-8391
Mfr. Part No.SKKT 132/16 E
BrandSemikron
$176.73
Each
units
137A SCR Module SEMIPACK2 1600V - 4.7kA Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 262-8335
Mfr. Part No.SKKH 92/16 E
BrandSemikron
$140.96
Each
units
95A SCR Module SEMIPACK1 1600V - 2kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 468-2369
Mfr. Part No.SKKH 106/16 E
BrandSemikron
$304.16
Each
units
106A SCR Module SEMIPACK1 1600V - 2.25kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 905-6239
Mfr. Part No.SKKT 570/16 E
BrandSemikron
$1,329.19
Each
units
570A SCR A 46 1600V - 1500A Panel Mount - 150mA - - 3V - 250mA