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. 168-6672
Mfr. Part No.TN22-1500T
HK$12.128
Each (In a Tube of 50)
units
1.8A SCR TO-220AB 400V - 22A Through Hole - 1.5mA - - 3V - 175mA
New
RS Stock No. 217-7210
Mfr. Part No.TD280N18SOFHPSA1
BrandInfineon
HK$598.353
Each (In a Tray of 3)
units
280A Diode - 1800V - - - - 150mA - - 2V - 150mA
RS Stock No. 287-9684
Mfr. Part No.VS-16TTS12-M3
BrandVishay
HK$39.94
Each
units
10A SCR TO-220AC 1200V - 200A Through Hole - 60mA - - 2V - 100mA
RS Stock No. 862-4916
Mfr. Part No.2N6405G
BrandLittelfuse
HK$10.485
Each (In a Pack of 10)
units
10A SCR TO-220AB 800V - 160A Through Hole - 60mA - - 2.5V - 60mA
RS Stock No. 760-9275
Mfr. Part No.DCR950D14
BrandDynex
HK$1,042.75
Each
units
950A SCR Type G 1400V - 12800A Stud - 300mA - - 3V - 200mA
RS Stock No. 793-1932
Mfr. Part No.S8040R
BrandLittelfuse
HK$33.516
Each (In a Pack of 5)
units
40A SCR TO-220AB 400V - 520A Through Hole - 40000µA - - 1.5V - 60mA
RS Stock No. 668-7022
Mfr. Part No.MCC132-08io1
BrandIXYS
HK$473.41
Each
units
130A SCR Module Y4 M6 800V - 5.08kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 169-5841
Mfr. Part No.ST180C16C0
BrandVishay
HK$710.539
Each (In a Box of 12)
units
350A PCT TO-200AB 1600V - 5230A Screw Mount - 150mA - - 3V - 600mA
RS Stock No. 905-6190
Mfr. Part No.SKKT 162/22 E H4
BrandSemikron
HK$1,564.07
Each
units
143A SCR SEMIPACK2 2200V - 5200A Panel Mount - 150mA - - 2V - 400mA
RS Stock No. 177-5362
Mfr. Part No.MCD56-08IO1B
BrandIXYS
HK$177.807
Each (In a Box of 36)
units
64A SCR Module TO-240AA 800V - 1.6kA Panel Mount - 100mA - - 1.5V - 200mA
RS Stock No. 710-2702
Mfr. Part No.VS-25TTS08STRL-M3
BrandVishay
HK$18.81
Each
units
16A SCR D2PAK (TO-263) 800V - 350A Surface Mount - 45mA - - 2V - 100mA
New
RS Stock No. 213-3420
Mfr. Part No.SV6012L1TP
BrandLittelfuse
HK$17.704
Each (In a Pack of 5)
units
12A SCR TO-220L 600V - - - - - - - - - -
RS Stock No. 168-4784
Mfr. Part No.N0795YN180
BrandIXYS
HK$1,315.81
Each (In a Box of 24)
units
795A PCT - 1000 to 1800V - 10500A Screw Mount - 150mA - - 2.50V - 300mA
RS Stock No. 146-1718
Mfr. Part No.DCR960G18
BrandDynex
HK$1,624.669
Each (In a Box of 7)
units
960A SCR Type G 1800V - 14000A Stud - 300mA - - 3V - 200mA
RS Stock No. 168-6665
Mfr. Part No.TYN625RG
HK$13.115
Each (In a Tube of 50)
units
16A SCR TO-220AB 600V - 314A Through Hole - 40mA - - 1.3V - 50mA
New
RS Stock No. 217-7177
Mfr. Part No.ETT630N16P60HPSA1
BrandInfineon
HK$2,336.69
Each
units
635A Diode - 1600V - - - - 250mA - - 2V - 300mA
RS Stock No. 878-1794
Mfr. Part No.Q8010L4
BrandLittelfuse
HK$16.062
Each (In a Pack of 500)
units
10A - TO-220 800V - 120A Through Hole - 25 mA, 50 mA - - 1.3V - 35mA
RS Stock No. 123-1466
Mfr. Part No.FS5030QP00TU
HK$19.252
Each (In a Pack of 5)
units
50A SCR TO-3P 1200V - - Through Hole - 80mA - - - - -
New
RS Stock No. 217-7214
Mfr. Part No.TD320N18SOFHPSA1
BrandInfineon
HK$619.457
Each (In a Tray of 3)
units
320A Diode - 1800V - - - - 150mA - - 2V - 150mA
RS Stock No. 178-1423
Mfr. Part No.BT151X-500R,127
HK$3.781
Each (In a Tube of 50)
units
7.5A SCR TO-220F 500V - 110A Through Hole - 15mA - - 1.5V - 20mA