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

...
Read more Read less

Filters

Viewing 1 - 20 of 774 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. 841-924
Mfr. Part No.PSR-25
R 905.95
Each
units
- - - - 25A - Panel Mount 6kW - - - - - -
RS stock no. 168-6673
Mfr. Part No.TYN610RG
R 19.698
Each (In a Tube of 50)
units
6.4A SCR TO-220AB 600V - 105A Through Hole - 15mA - - 1.5V - 30mA
RS stock no. 232-9369
Mfr. Part No.FC11BL/2
R 1,423.91
Each
units
- - - - - - - - - - - - - -
RS stock no. 687-1053
Mfr. Part No.TYN610RG
R 23.83
Each (In a Pack of 5)
units
6.4A SCR TO-220AB 600V - 105A Through Hole - 15mA - - 1.5V - 30mA
RS stock no. 168-4489
Mfr. Part No.MCC312-16IO1
BrandIXYS
R 2,434.703
Each (In a Box of 3)
units
320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA
RS stock no. 194-265
Mfr. Part No.MCC312-16IO1
BrandIXYS
R 2,437.57
Each
units
320A SCR Module Y1 CU 1600V - 10.1kA Panel Mount - 150mA - - 2V - 150mA
RS stock no. 489-3575
Mfr. Part No.PR3-E-18KW
R 7,005.76
Each
units
- - - - 25A - Panel Mount 18kW - - - - - -
RS stock no. 700-5591
Mfr. Part No.VS-70TPS12PBF
BrandVishay
R 146.14
Each
units
70A SCR Super-247 1200V - 1400A Through Hole - 100mA - - 1.5V - 200mA
RS stock no. 145-1769
Mfr. Part No.VS-70TPS12PBF
BrandVishay
R 116.484
Each (In a Tube of 25)
units
70A SCR Super-247 1200V - 1400A Through Hole - 100mA - - 1.5V - 200mA
RS stock no. 214-3979
Mfr. Part No.ZVS-16DV
R 1,296.97
Each
units
- - - - 16A - Screw Mount 3.7kW - - - - - -
RS stock no. 165-5402
Mfr. Part No.TZ425N16KOFHPSA1
BrandInfineon
R 2,646.59
Each (In a Tray of 3)
units
425A PCT BG-PB501-1 1600V - 14500A Panel Mount - 250mA - - 1.5V - 300mA
RS stock no. 839-1313
Mfr. Part No.TZ425N16KOFHPSA1
BrandInfineon
R 2,646.52
Each
units
425A PCT BG-PB501-1 1600V - 14500A Panel Mount - 250mA - - 1.5V - 300mA
RS stock no. 168-4495
Mfr. Part No.CS20-16IO1
BrandIXYS
R 72.624
Each (In a Tube of 30)
units
19A SCR TO-247AD 1600V - 215A Through Hole - 65mA - - 1V - 100mA
RS stock no. 194-366
Mfr. Part No.CS20-16IO1
BrandIXYS
R 76.69
Each
units
19A SCR TO-247AD 1600V - 215A Through Hole - 65mA - - 1V - 100mA
RS stock no. 905-6188
Mfr. Part No.SKKT 273/16 E
BrandSemikron
R 2,682.97
Each
units
320A SCR A 43a 1600V - 9500A Panel Mount - 150mA - - 2V - 500mA
RS stock no. 505-3116
Mfr. Part No.SKKT250/18E
BrandSemikron
R 7,145.11
Each
units
250A SCR Module SEMIPACK3 1800V - 9kA Panel Mount - 200mA - - 3V - 500mA
RS stock no. 168-4784
Mfr. Part No.N0795YN180
BrandIXYS
R 1,223.174
Each (In a Box of 24)
units
795A PCT - 1000 to 1800V - 10500A Screw Mount - 150mA - - 2.50V - 300mA
RS stock no. 905-6122
Mfr. Part No.SKKT 106/16 E
BrandSemikron
R 2,212.16
Each
units
106A SCR A 46 1600V - 2250A Panel Mount - 150mA - - 3V - 250mA
RS stock no. 825-2631
Mfr. Part No.N0795YN180
BrandIXYS
R 1,273.16
Each
units
795A PCT - 1000 to 1800V - 10500A Screw Mount - 150mA - - 2.50V - 300mA
RS stock no. 232-9347
Mfr. Part No.FC36M
R 6,049.70
Each
units
- - - - - - - - - 3500Vrms - - 5V dc -