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. 768-9026
Mfr. Part No.N1718NC180
BrandIXYS
€252.67
Each
units
1718A PCT N1718 2000V 27200A Stud 300mA 3V 1000mA 2 - - 27.7mm 74 (Dia.) x 27.7mm
RS Stock No. 761-3990
Mfr. Part No.CS30-12io1
BrandIXYS
€4.18
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. 177-5223
Mfr. Part No.MCR716T4G
BrandLittelfuse
€0.36
Each (On a Reel of 2500)
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. 168-4652
Mfr. Part No.CS45-12IO1
BrandIXYS
€3.978
Each (In a Tube of 30)
units
48A SCR TO-247AD 1200V 560A Through Hole 200mA 1.6V 100mA 3 16.24mm 5.3mm 21.45mm 16.24 x 5.3 x 21.45mm
RS Stock No. 878-1842
Mfr. Part No.SK055R
BrandLittelfuse
€2.163
Each (In a Pack of 500)
units
55A SCR TO-220 1000V 650A Through Hole 40mA 1.5V 60mA 3 10.67mm 4.78mm 15.75mm 10.67 x 4.78 x 15.75mm
RS Stock No. 878-1788
Mfr. Part No.L6004D5TP
BrandLittelfuse
€0.776
Each (In a Pack of 750)
units
4A - DPAK (TO-252) 600V 40A Surface Mount 5mA 1.3V 10mA 3 6.73mm 6.22mm 2.41mm 6.73 x 6.22 x 2.41mm
RS Stock No. 761-3993
Mfr. Part No.CS30-14io1
BrandIXYS
€3.91
Each
units
31A SCR TO-247AD 1400V 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. 168-6662
Mfr. Part No.TYN1225RG
€2.199
Each (In a Tube of 50)
units
16A SCR TO-220AB 1200V 260A Through Hole 40mA 1.5V 50mA 3 10.4mm 4.6mm 9.15mm 10.4 x 4.6 x 9.15mm
RS Stock No. 811-1050
Mfr. Part No.TYN412RG
€1.21
Each (In a Pack of 10)
units
12A SCR TO-220 - 145A Through Hole 15mA 1.3V 30mA 3 10.4mm 4.6mm 15.75mm 10.4 x 4.6 x 15.75mm
RS Stock No. 768-9013
Mfr. Part No.N0910LC260-U9900
BrandIXYS
€157.69
Each
units
910A PCT N0910 2600V 9200A Stud 300mA 3V 1000mA 2 - - 27mm 58.5 (Dia.) x 27mm
RS Stock No. 168-6663
Mfr. Part No.X0402NF 1AA2
€0.604
Each (In a Bag of 250)
units
0.9A SCR TO-202 800V 33A Through Hole 0.2mA 0.8V 5mA 3 10.1mm 4.5mm 7.3mm 10.1 x 4.5 x 7.3mm
RS Stock No. 877-3071
Mfr. Part No.TYN612RG
€1.198
Each (In a Pack of 10)
units
8A SCR TO-220AB 600V 145A Through Hole 200µA 0.8V 5mA 3 10.4mm 4.6mm 15.75mm 10.4 x 4.6 x 15.75mm
RS Stock No. 395-9258
Mfr. Part No.VS-ST180S12P1VPBF
BrandVishay
€74.72
Each
units
200A SCR TO-93 1200V 5230A Thread Mount 150mA 3V 600mA 3 35mm 30.33mm 49.5mm 35 x 30.33 x 49.5mm
RS Stock No. 194-827
Mfr. Part No.N0992YS020
BrandIXYS
€86.99
Each
units
992A SCR - 200V 12100A Stud 150mA 3V 500mA 3 - - 15.1mm 42 (Dia.) x 15.1mm
RS Stock No. 878-1845
Mfr. Part No.S6S2RP
BrandLittelfuse
€0.48
Each (In a Pack of 2500)
units
0.8A SCR Compak 600V 20A Surface Mount 50µA 0.8V 5mA 3 4.6mm 3.95mm 2.65mm 4.6 x 3.95 x 2.65mm
RS Stock No. 792-5650
Mfr. Part No.MCR08BT1G
BrandLittelfuse
€0.142
Each (On a Tape of 10)
units
0.8A SCR SOT-223 200V 8A Surface Mount 200µA 0.8V 5mA 3+Tab 6.7mm 3.7mm 1.65mm 6.7 x 3.7 x 1.65mm
RS Stock No. 169-5955
Mfr. Part No.T50RIA60
BrandVishay
€24.632
Each (In a Box of 10)
units
50A SCR D 55 600V 1370A Panel Mount 100mA 2.5V 200mA 3 41mm 27mm 25mm 41 x 27 x 25mm
RS Stock No. 165-5059
Mfr. Part No.FS0809MD TR
€0.139
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. 807-9944
Mfr. Part No.MCR708AT4G
BrandLittelfuse
€0.319
Each (On a Tape of 50)
units
- SCR DPAK (TO-252) 600V 35A Surface Mount 300µA 1V 10mA 3 6.73mm 6.22mm 2.38mm 6.73 x 6.22 x 2.38mm
RS Stock No. 876-5755
Mfr. Part No.TS110-8UF
€0.201
Each (In a Pack of 20)
units
0.8A SCR SMB 800V 21A Surface Mount 100µA 0.8V 12mA 3 4.6mm 3.95mm 1.1mm 4.6 x 3.95 x 1.1mm
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