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. 301-619
Mfr. Part No.VS-40TPS12A-M3
BrandVishay
HK$64.41
Each
units
35A SCR TO-247AC 1200V 600A Through Hole 40mA 2.5V 150mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 920-0798
Mfr. Part No.CS35-12IO4
BrandIXYS
HK$251.92
Each (In a Tube of 10)
units
69A SCR TO-208AC 1200V 1340A Thread Mount 100mA 1.5V 80mA 2 19.62mm 17mm 41.3mm 19.62 x 17 x 41.3mm
RS Stock No. 145-1785
Mfr. Part No.VS-40TPS16-M3
BrandVishay
HK$34.332
Each (In a Tube of 25)
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. 357-3999
Mfr. Part No.VS-30TPS08-M3
BrandVishay
HK$21.54
Each
units
20A SCR TO-247 800V 300A Through Hole 60mA 2.5V 100mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 169-5881
Mfr. Part No.30TPS08PBF
BrandVishay
HK$14.923
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 165-5771
Mfr. Part No.BTW69-1200N
HK$31.40
Each (In a Tube of 30)
units
31A SCR TOP3 1200V 763A Through Hole 50mA 1.3V 100mA 3 15.5mm 4.6mm 21.1mm 15.5 x 4.6 x 21.1mm
RS Stock No. 197-804
BrandIXYS
HK$275.25
Each
units
69A SCR TO-208AC 1200V 1340A Thread Mount 100mA 1.5V 80mA 2 19.62mm 17mm 41.3mm 19.62 x 17 x 41.3mm
RS Stock No. 197-826
Mfr. Part No.CS30-16IO1
BrandIXYS
HK$41.77
Each
units
31A SCR TO-247AD 1600V 320A Through Hole 65mA 1V 100mA 3 16.26mm - 21.46mm -
RS Stock No. 817-2459
Mfr. Part No.VS-50RIA100
BrandVishay
HK$142.50
Each
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. 817-2465
Mfr. Part No.VS-50RIA80
BrandVishay
HK$150.24
Each
units
80A SCR TO-65 800V 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. 169-5837
Mfr. Part No.22RIA120
BrandVishay
HK$47.83
Each (In a Bag of 100)
units
22A SCR TO-48 1200V 420A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 227-9090
Mfr. Part No.VS-22RIA120
BrandVishay
HK$139.49
Each
units
22A SCR TO-48 1200V 420A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 169-5836
Mfr. Part No.22RIA80
BrandVishay
HK$46.919
Each (In a Bag of 100)
units
22A SCR TO-48 800V 420A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 169-5920
Mfr. Part No.50RIA40
BrandVishay
HK$74.031
Each (In a Bag of 100)
units
50A SCR TO-65 400V 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. 807-9953
Mfr. Part No.MCR716T4G
BrandLittelfuse
HK$4.414
Each (In a Pack of 50)
units
2.6A SCR DPAK (TO-252) 400V 25A Surface Mount 300µA 1V 10mA 3 6.73mm 6.22mm 2.38mm 6.73 x 6.22 x 2.38mm
RS Stock No. 165-5059
Mfr. Part No.FS0809MD TR
HK$2.679
Each (On a Reel of 2500)
units
8A SCR DPAK (TO-252) 600V 70 A @ 50 Hz, 73 A @ 60 Hz Surface Mount 15mA 1.3V 40mA 3 6.73mm 6.22mm 2.39mm 6.73 x 6.22 x 2.39mm
RS Stock No. 877-3043
Mfr. Part No.TN1515-600B-TR
HK$8.649
Each (In a Pack of 10)
units
9.5A SCR DPAK (TO-252) 600V 165A Surface Mount 15mA 1.3V 40mA 3 6.6mm 6.2mm 2.4mm 6.6 x 6.2 x 2.4mm
RS Stock No. 169-5833
Mfr. Part No.16RIA80
BrandVishay
HK$46.007
Each (In a Bag of 100)
units
16A SCR TO-48 800V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 768-9026
Mfr. Part No.N1718NC180
BrandIXYS
HK$2,081.39
Each
units
1718A PCT N1718 2000V 27200A Stud 300mA 3V 1000mA 2 - - 27.7mm 74 (Dia.) x 27.7mm
RS Stock No. 169-5894
Mfr. Part No.16RIA100
BrandVishay
HK$46.007
Each (In a Bag of 100)
units
16A SCR TO-48 1000V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
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