Thyristors

What is a Thyristor?
A Thyristor is a four layer semiconductor device, 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.
A Thyristor usually consists 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
The Thyristor is 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 Thyristor:
Silicon controlled rectifier (SCR) -The basic purpose of a 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 a 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.
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 it’s OFF.
Diac- Diac is a mix of the words diode and ac switch it is similar to four-layer diode but it can conduct in both directions meaning it can contact both AC and DC currents.
Thyristors are used in applications such as motor speed controls, pressure control systems, light dimmers and liquid level regulators
What are Phase controlled Thyristors?
Thyristors are frequently used as phase-controlled current valves for AC to DC conversion and vice versa, operating at low frequencies In the conducting state, thyristors feature very low losses, making them ideal devices to efficiently control very high currents and energies.

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Description Price Rated Average On-State Current Thyristor Type Package Type Repetitive Peak Reverse Voltage Surge Current Rating Mounting Type Maximum Gate Trigger Current Maximum Gate Trigger Voltage Maximum Holding Current Pin Count Length Width Height Dimensions
RS Stock No. 817-2453
Mfr. Part No.VS-50RIA20
BrandVishay
HK$108.54
Each
units
80A SCR TO-65 200V 1490A Thread Mount 250mA 3.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 700-5639
Mfr. Part No.VS-ST380CH06C1
BrandVishay
HK$1,121.36
Each
units
960A PCT TO-200AB 600V 13000A Screw Mount 200mA 3V 600mA 3 42mm 42mm 15.1mm 42 x 42 x 15.1mm
RS Stock No. 920-0795
Mfr. Part No.CS30-16IO1
BrandIXYS
HK$35.263
Each (In a Tube of 30)
units
31A SCR TO-247AD 1600V 320A Through Hole 65mA 1V 100mA 3 16.26mm - 21.46mm -
RS Stock No. 169-5835
Mfr. Part No.22RIA60
BrandVishay
HK$46.919
Each (In a Bag of 100)
units
22A SCR TO-48 600V 420A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 169-5900
Mfr. Part No.VS-25RIA120M
BrandVishay
HK$87.147
Each (In a Bag of 100)
units
- - - - - - - - - - - - - -
RS Stock No. 227-9107
Mfr. Part No.VS-50RIA60
BrandVishay
HK$126.53
Each
units
50A SCR TO-65 600V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 761-3990
Mfr. Part No.CS30-12io1
BrandIXYS
HK$35.48
Each
units
31A SCR TO-247AD 1200V 320A Through Hole 80mA 1.2V 100mA 3 16.26mm 5.3mm 21.46mm 16.26 x 5.3 x 21.46mm
RS Stock No. 169-5838
Mfr. Part No.50RIA60
BrandVishay
HK$74.031
Each (In a Bag of 100)
units
50A SCR TO-65 600V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 165-6236
Mfr. Part No.VS-50RIA100
BrandVishay
HK$130.054
Each (In a Bag of 100)
units
80A SCR TO-65 1000V 1490A Thread Mount 250mA 3.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 395-3474
Mfr. Part No.VS-50RIA120
BrandVishay
HK$161.24
Each
units
50A SCR TO-65 1200V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 395-2875
Mfr. Part No.VS-25RIA60
BrandVishay
HK$110.25
Each
units
25A SCR TO-48 600V 440A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 227-9078
Mfr. Part No.VS-22RIA60
BrandVishay
HK$98.97
Each
units
22A SCR TO-48 600V 420A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 165-6021
Mfr. Part No.VS-2N5206
BrandVishay
HK$141.90
Each (In a Bag of 100)
units
22A SCR TO-208AA 1000V 340A Thread Mount 80mA 3V 200mA 2 - 14.3mm 41.7mm 15.5 x 14.3 x 41.7mm
RS Stock No. 714-2640
Mfr. Part No.BTW69-1200RG
HK$64.95
Each
units
32A SCR TOP3 1200V 610A Through Hole 80mA 1.3V 150mA 3 15.5mm 4.6mm 12.85mm 15.5 x 4.6 x 12.85mm
RS Stock No. 878-1855
Mfr. Part No.S6010LS2
BrandLittelfuse
HK$13.03
Each (In a Pack of 10)
units
10A SCR TO-220 600V 100A Through Hole 200µA 0.8V 6mA 3 10.67mm 4.78mm 15.75mm 10.67 x 4.78 x 15.75mm
RS Stock No. 687-1053
Mfr. Part No.TYN610RG
HK$8.618
Each (In a Pack of 5)
units
6.4A SCR TO-220AB 600V 105A Through Hole 15mA 1.5V 30mA 3 10.4mm 4.6mm 9.15mm 10.4 x 4.6 x 9.15mm
RS Stock No. 254-0544
Mfr. Part No.VS-25RIA120
BrandVishay
HK$140.80
Each
units
25A SCR TO-48 1200V 440A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 227-9084
Mfr. Part No.VS-22RIA80
BrandVishay
HK$111.25
Each
units
22A SCR TO-48 800V 420A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 708-4446
Mfr. Part No.VS-40TPS16-M3
BrandVishay
HK$41.14
Each
units
35A SCR TO-247AC 1600V 600A Through Hole 150mA 2.5V 150mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 839-1357
Mfr. Part No.T390N16TOFXPSA1
BrandInfineon
HK$701.63
Each
units
381A PCT BG-T4214K0-1 1600V 4900A Stud 150mA 2V 200mA 5 - - 14.5mm 42 (Dia.) x 14.5 (Height)mm
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