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. 169-5832
Mfr. Part No.16RIA60
BrandVishay
€9.885
Each (In a Bag of 100)
units
16A SCR TO-48 600V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 486-5485
Mfr. Part No.P0111MN 5AA4
€0.154
Each (In a Pack of 5)
units
0.5A SCR SOT-223 600V 8A Surface Mount 0.025mA 0.8V 5mA 3+Tab 6.5mm 3.5mm 1.8mm 6.5 x 3.5 x 1.8mm
RS Stock No. 163-9779
Mfr. Part No.TN4015H-6G-TR
€1.348
Each (In a Pack of 5)
units
25A SCR D2PAK 600V 394A Surface Mount 15mA 1.3V 60mA 2 + Tab 10.28mm 9.35mm 4.6mm 10.28 x 9.35 x 4.6mm
RS Stock No. 839-1391
Mfr. Part No.T880N16TOFXPSA1
BrandInfineon
€122.41
Each
units
880A PCT BG-T5726K-1 1600V 17500A Stud 250mA 2.2V 300mA 5 - - 26.5mm 58 (Dia.) x 26.5mm
RS Stock No. 168-4566
Mfr. Part No.CS60-16IO1
BrandIXYS
€5.091
Each (In a Tube of 30)
units
60A SCR PLUS247 1600V 1.51kA Through Hole 200mA 1.6V 200mA 3 16.13mm 5.21mm 21.34mm 16.13 x 5.21 x 21.34mm
RS Stock No. 171-0024
Mfr. Part No.C106M1G
BrandLittelfuse
€0.313
Each (In a Box of 500)
units
2.55A SCR TO-225 600V 20A Through Hole 0.2mA 0.8V 3mA 3 7.74mm 2.66mm 11.04mm 7.74 x 2.66 x 11.04mm
RS Stock No. 145-1769
Mfr. Part No.VS-70TPS12PBF
BrandVishay
€6.695
Each (In a Tube of 25)
units
70A SCR Super-247 1200V 1400A Through Hole 100mA 1.5V 200mA 3 16.1mm - 20.8mm -
RS Stock No. 125-8053
Mfr. Part No.MCO150-16io1
BrandIXYS
€21.81
Each
units
158A - SOT-227B 1600V 2.16kA Screw 200mA 1.6V 200mA 4 38.23mm 25.25mm 12.22mm 38.23 x 25.25 x 12.22mm
RS Stock No. 165-6020
Mfr. Part No.VS-25RIA80
BrandVishay
€2.729
Each (In a Bag of 100)
units
25A SCR TO-208AA 800V 440A Thread Mount 90mA 3V 130mA 2 - 14.3mm 41.7mm 15.5 x 14.3 x 41.7mm
RS Stock No. 103-7543
Mfr. Part No.BT151-800R
€0.53
Each (In a Tube of 50)
units
7.5A SCR TO-220AB 800V 132A Through Hole 15mA 1.5V 20mA 3 10.3mm 4.7mm 9.4mm 10.3 x 4.7 x 9.4mm
RS Stock No. 165-2655
Mfr. Part No.VS-ST380CH06C1
BrandVishay
€88.525
Each (In a Box of 12)
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. 227-9214
Mfr. Part No.VS-ST230C16C0
BrandVishay
€69.49
Each
units
410A PCT TO-200AB 1600V 5970A Screw Mount 150mA 3V 600mA 3 42mm 42mm 14.4mm 42 x 42 x 14.4mm
RS Stock No. 395-9185
Mfr. Part No.VS-T70RIA120
BrandVishay
€31.22
Each
units
70A SCR D 55 1200V 1740A Panel Mount 120mA 2.5V 200mA 3 41mm 27mm 25mm 41 x 27 x 25mm
RS Stock No. 166-0034
Mfr. Part No.BT149G
€0.133
Each (On a Tape of 2000)
units
0.5A SCR TO-92 600V 9A Through Hole 200µA 0.8V 5mA 3 4.2mm 4.8mm 5.2mm 4.2 x 4.8 x 5.2mm
RS Stock No. 509-601
Mfr. Part No.BT258X-500R
€0.224
Each (In a Pack of 10)
units
5A SCR TO-220F 500V 82A Through Hole 0.2mA 1.5V 6mA 3 10.3mm 4.6mm 9.3mm 10.3 x 4.6 x 9.3mm
RS Stock No. 227-9062
Mfr. Part No.VS-16RIA120
BrandVishay
€16.34
Each
units
16A SCR TO-48 1200V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 177-5205
Mfr. Part No.MCR72-8G
BrandLittelfuse
€0.571
Each (In a Box of 500)
units
8A SCR TO-220AB 600V 100A Through Hole 200µA 1.5V 6mA 3 10.28mm 4.82mm 15.75mm 10.28 x 4.82 x 15.75mm
RS Stock No. 169-5835
Mfr. Part No.22RIA60
BrandVishay
€3.00
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. 395-2724
Mfr. Part No.VS-16RIA100
BrandVishay
€17.03
Each
units
16A SCR TO-48 1000V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 484-5582
Mfr. Part No.BT148W-600R
€0.212
Each (In a Pack of 10)
units
0.6A SCR SOT-223 (SC-73) 600V 11A Surface Mount 0.2mA 1.5V 6mA 4 6.7mm 3.7mm 1.7mm 6.7 x 3.7 x 1.7mm
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