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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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
$95.31
Each
units
- - - - 25A - Panel Mount 6kW - - - - - -
RS Stock No. 841-930
Mfr. Part No.TPSR-25
$86.41
Each
units
- - - - - - - - - - - - - -
RS Stock No. 687-1019
Mfr. Part No.TYN640RG
$4.975
Each (In a Pack of 2)
units
25A SCR TO-220AB 600V - 480A Through Hole - 35mA - - 1.3V - 75mA
RS Stock No. 168-6666
Mfr. Part No.TYN640RG
$3.78
Each (In a Tube of 50)
units
25A SCR TO-220AB 600V - 480A Through Hole - 35mA - - 1.3V - 75mA
RS Stock No. 829-0469
Mfr. Part No.TXN625RG
$4.466
Each (In a Pack of 5)
units
16A SCR TO-220AB 600V - 314A Through Hole - 40mA - - 1.3V - 50mA
RS Stock No. 168-8046
Mfr. Part No.TXN625RG
$3.924
Each (In a Tube of 50)
units
16A SCR TO-220AB 600V - 314A Through Hole - 40mA - - 1.3V - 50mA
RS Stock No. 195-4633
Mfr. Part No.SKKT 106B16 E
BrandSemikron
$110.09
Each
units
106A SCR Module SEMIPACK1 1600V - 2.25kA Panel Mount - 150mA - - 3V - 250mA
RS Stock No. 178-7030
Mfr. Part No.S4065JTP
BrandLittelfuse
$7.371
Each (In a Tube of 250)
units
65A SCR TO-218X 400V - 950A Through Hole - 50mA - - 2V - 80mA
RS Stock No. 793-1923
Mfr. Part No.S4065JTP
BrandLittelfuse
$13.06
Each
units
65A SCR TO-218X 400V - 950A Through Hole - 50mA - - 2V - 80mA
RS Stock No. 625-4994
Mfr. Part No.C106M1G
BrandLittelfuse
$1.17
Each
units
2.55A SCR TO-225 600V - 20A Through Hole - 0.2mA - - 0.8V - 3mA
RS Stock No. 544-9999
Mfr. Part No.2N6507G
BrandLittelfuse
$4.97
Each
units
16A SCR TO-220AB 400V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS Stock No. 232-9353
Mfr. Part No.FC11AL/2
$243.65
Each
units
- - - - - - - - - - - - - -
RS Stock No. 103-2939
Mfr. Part No.2N6507G
BrandLittelfuse
$2.312
Each (In a Box of 500)
units
16A SCR TO-220AB 400V - 250A Through Hole - 30mA - - 1.5V - 40mA
RS Stock No. 171-0024
Mfr. Part No.C106M1G
BrandLittelfuse
$0.501
Each (In a Box of 500)
units
2.55A SCR TO-225 600V - 20A Through Hole - 0.2mA - - 0.8V - 3mA
RS Stock No. 193-717
Mfr. Part No.MCC95-16IO1B
BrandIXYS
$58.59
Each
units
116A SCR Module TO-240AA 1600V - 2.4kA Panel Mount - 150mA - - 2.5V - 200mA
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. 658-160
Mfr. Part No.SKPC100-440
BrandSemikron
$148.43
Each
units
- - - - - - Screw Mount - - - - - - -
RS Stock No. 168-6662
Mfr. Part No.TYN1225RG
$4.10
Each (In a Tube of 50)
units
16A SCR TO-220AB 1200V - 260A Through Hole - 40mA - - 1.5V - 50mA
RS Stock No. 195-3523
Mfr. Part No.STOM-1
$258.87
Each
units
- - - - - - Screw Mount - - 3500V 18V ac - - -
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