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. 761-4000
Mfr. Part No.CS45-12io1
BrandIXYS
HK$44.93
Each
units
48A SCR TO-247AD 1200V - 560A Through Hole - 200mA - - 1.6V - 100mA
RS Stock No. 774-3559
Mfr. Part No.MCR72-8G
BrandLittelfuse
HK$11.67
Each (In a Pack of 2)
units
8A SCR TO-220AB 600V - 100A Through Hole - 200µA - - 1.5V - 6mA
RS Stock No. 165-6352
Mfr. Part No.VS-VSKT105/16
BrandVishay
HK$395.514
Each (In a Box of 10)
units
105A SCR, SCR Module TO-240AA 1600V - 2000A Panel Mount - 270mA - - 4V - 250mA
RS Stock No. 194-035
Mfr. Part No.MCC132-16IO1
BrandIXYS
HK$526.45
Each
units
130A SCR Module Y4 M6 1600V - 5.08kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 124-5420
Mfr. Part No.NYC0102BLT1G
BrandLittelfuse
HK$1.082
Each (On a Reel of 3000)
units
0.25A SCR SOT-23 200V - 7A Surface Mount - 200µA - - 0.8V - 6mA
RS Stock No. 168-4651
Mfr. Part No.CS45-08IO1
BrandIXYS
HK$37.025
Each (In a Tube of 30)
units
48A SCR TO-247AD 800V - 560A Through Hole - 200mA - - 1.6V - 100mA
RS Stock No. 168-4595
Mfr. Part No.MCC132-08IO1
BrandIXYS
HK$511.053
Each (In a Box of 6)
units
130A SCR Module Y4 M6 800V - 5.08kA Panel Mount - 150mA - - 2.5V - 200mA
RS Stock No. 177-7508
Mfr. Part No.VS-10TTS08S-M3
BrandVishay
HK$8.474
Each (On a Reel of 1000)
units
6.5A SCR D2PAK (TO-263) 800V - 140A Surface Mount - 15mA - - 1V - 30mA
RS Stock No. 873-2314
Mfr. Part No.VS-81RIA120PBF
BrandVishay
HK$385.90
Each
units
80A SCR TO-209AC 1200V - - Thread Mount - 270mA - - 3.5V - 200mA
New
RS Stock No. 213-3437
Mfr. Part No.SV6025L2TP
BrandLittelfuse
HK$22.342
Each (In a Tube of 50)
units
- SCR TO-220L 600V - - - - - - - - - -
RS Stock No. 839-1288
Mfr. Part No.TT330N16AOFHPSA1
BrandInfineon
HK$1,596.61
Each
units
330A PCT Module 50mm 1600V - 9100A Panel Mount - 200mA - - 2V - 300mA
New
RS Stock No. 216-3053
Mfr. Part No.A407649
HK$870.36
Each
units
- - - - 6.3A - - - - - - - - -
RS Stock No. 177-5210
Mfr. Part No.2N6405G
BrandLittelfuse
HK$7.686
Each (In a Box of 500)
units
10A SCR TO-220AB 800V - 160A Through Hole - 60mA - - 2.5V - 60mA
RS Stock No. 700-5068
Mfr. Part No.VS-VSKT162/16PBF
BrandVishay
HK$737.88
Each
units
160A SCR INT-A-PAK 1600V - 5.1kA Panel Mount - 270mA - - 4V - 200mA
RS Stock No. 807-9944
Mfr. Part No.MCR708AT4G
BrandLittelfuse
HK$6.206
Each (On a Tape of 50)
units
- SCR DPAK (TO-252) 600V - 35A Surface Mount - 300µA - - 1V - 10mA
RS Stock No. 165-7773
Mfr. Part No.P0111MA 1AA3
HK$1.743
Each (In a Bag of 2500)
units
0.5A SCR TO-92 600V - 8A Through Hole - 0.025mA - - 0.8V - 5mA
New
RS Stock No. 217-7239
Mfr. Part No.TT390N18SOFHPSA1
BrandInfineon
HK$888.18
Each
units
380A Diode - 1800V - - - - 150mA - - 2V - 150mA
RS Stock No. 178-0869
Mfr. Part No.VS-25TTS12S-M3
BrandVishay
HK$16.399
Each (In a Tube of 50)
units
16A SCR D2PAK (TO-263) 1200V - 350A Surface Mount - 45mA - - 2V - 100mA
RS Stock No. 178-7029
Mfr. Part No.S6065KTP
BrandLittelfuse
HK$46.904
Each (In a Tube of 250)
units
65A SCR TO-218AC 600V - 950A Through Hole - 50mA - - 2V - 80mA
RS Stock No. 700-5633
Mfr. Part No.VS-ST700C18L1
BrandVishay
HK$1,453.03
Each
units
910A PCT TO-200AC 1800V - 16400A Screw Mount - 200mA - - 3V - 600mA