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 21 - 40 of 806 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. 658-160
Mfr. Part No.SKPC100-440
BrandSemikron
$148.33
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 700-5611
Mfr. Part No.VS-P402W
BrandVishay
$78.84
Each
units
40A SCR Module PACE-PAK 600V - 0.4kA Screw Mount - 60mA - - 2V - 130mA
RS Stock No. 193-717
Mfr. Part No.MCC95-16IO1B
BrandIXYS
$58.19
Each
units
116A SCR Module TO-240AA 1600V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 166-0389
Mfr. Part No.BT169G,112
$0.159
Each (In a Bag of 1000)
units
0.5A SCR SPT 600V - 9A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 687-1000
Mfr. Part No.TYN1225RG
$5.72
Each
units
16A SCR TO-220AB 1200V - 260A Through Hole - 40mA - - 1.5V - 50mA
RS Stock No. 195-3523
Mfr. Part No.STOM-1
$258.73
Each
units
- - - - - - Screw Mount - - 3500V 18V ac - - -
RS Stock No. 485-4299
Mfr. Part No.BT169G,112
$0.52
Each (In a Pack of 25)
units
0.5A SCR SPT 600V - 9A Through Hole - 0.2mA - - 0.8V - 5mA
RS Stock No. 183-2268
Mfr. Part No.SKCH 28/12
BrandSemikron
$326.87
Each
units
30A SCR Module SEMIPONT®1 1200V - 0.32kA Screw Mount - 100mA - - 2V - 150mA
RS Stock No. 195-4649
Mfr. Part No.SKKT 162/16 E
BrandSemikron
$124.38
Each
units
156A SCR Module SEMIPACK2 1600V - 5.4kA Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 877-3068
Mfr. Part No.TS820-600B-TR
$1.595
Each (In a Pack of 20)
units
5A SCR DPAK (TO-252) 600V - 73A Surface Mount - 200µA - - 0.8V - 5mA
RS Stock No. 262-488
Mfr. Part No.BT152-600R,127
$1.93
Each
units
13A SCR TO-220AB 650V - 220A Through Hole - 32mA - - 1.5V - 60mA
RS Stock No. 165-5529
Mfr. Part No.TS820-600B-TR
$0.698
Each (On a Reel of 2500)
units
5A SCR DPAK (TO-252) 600V - 73A Surface Mount - 200µA - - 0.8V - 5mA
RS Stock No. 825-2631
Mfr. Part No.N0795YN180
BrandIXYS
$241.63
Each
units
795A PCT - 1000 to 1800V - 10500A Screw Mount - 150mA - - 2.50V - 300mA
RS Stock No. 485-4283
Mfr. Part No.BT151-650R,127
$1.326
Each (In a Pack of 5)
units
7.5A SCR TO-220AB 650V - 132A Through Hole - 15mA - - 1.5V - 20mA
RS Stock No. 168-9625
Mfr. Part No.BT152-400R,127
$1.507
Each (In a Tube of 50)
units
13A SCR TO-220AB 450V - 220A Through Hole - 32mA - - 1.5V - 60mA
RS Stock No. 214-3979
Mfr. Part No.ZVS-16DV
$131.84
Each
units
- - - - 16A - Screw Mount 3.7kW - - - - - -
RS Stock No. 214-3963
Mfr. Part No.QVR-TB-RFI
$113.61
Each
units
- - - - - - Panel Mount - - - - - - -
RS Stock No. 262-8391
Mfr. Part No.SKKT 132/16 E
BrandSemikron
$189.81
Each
units
137A SCR Module SEMIPACK2 1600V - 4.7kA Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 700-5617
Mfr. Part No.VS-P135
BrandVishay
$68.76
Each
units
25A SCR Module PACE-PAK 1200V - 0.375kA Screw Mount - 60mA - - 2V - 130mA
RS Stock No. 484-2870
Mfr. Part No.BT152-400R,127
$1.866
Each (In a Pack of 5)
units
13A SCR TO-220AB 450V - 220A Through Hole - 32mA - - 1.5V - 60mA