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. 178-1423
Mfr. Part No.BT151X-500R,127
HK$3.781
Each (In a Tube of 50)
units
7.5A SCR TO-220F 500V 110A Through Hole 15mA 1.5V 20mA 3 10.3mm 4.6mm 9.3mm 10.3 x 4.6 x 9.3mm
RS Stock No. 708-4165
Mfr. Part No.VS-10TTS08-M3
BrandVishay
HK$15.098
Each (In a Pack of 5)
units
6.5A SCR TO-220AB 800V 140A Through Hole 15mA 1V 30mA 3 10.66mm 4.82mm 9.02mm 10.66 x 4.82 x 9.02mm
RS Stock No. 905-6162
Mfr. Part No.SKT 551/16 E
BrandSemikron
HK$925.62
Each
units
391A SCR B 11 1600V 9000A Panel Mount 250 (Min)mA 3 (Min)V 500mA 3 - - 14mm 41.5 (Dia.) x 14mm
RS Stock No. 687-1003
Mfr. Part No.X0402NF 1AA2
HK$5.882
Each (In a Pack of 5)
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. 170-2398
Mfr. Part No.FS2514MH TU
HK$6.17
Each (In a Tube of 50)
units
25A SCR TO-220AB 600V 300 A @ 50 Hz, 330 A @ 60 Hz Through Hole 40mA 1.3V 50mA 3 10.36mm 4.67mm 15.35mm 10.36 x 4.67 x 15.35mm
RS Stock No. 177-5223
Mfr. Part No.MCR716T4G
BrandLittelfuse
HK$4.259
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. 177-5215
Mfr. Part No.MCR72-6G
BrandLittelfuse
HK$5.785
Each (In a Box of 500)
units
8A SCR TO-220AB 400V 100A Through Hole 200mA 1.5V 6mA 3 10.53mm 4.83mm 15.75mm 10.53 x 4.83 x 15.75mm
RS Stock No. 839-1367
Mfr. Part No.T430N16TOFXPSA1
BrandInfineon
HK$664.60
Each
units
433A PCT BG-T4214K0-1 1600V 5200A Stud 200mA 2V 300mA 5 - - 14.5mm 42 (Dia.) x 14.5 (Height)mm
RS Stock No. 920-0741
Mfr. Part No.CS19-12HO1
BrandIXYS
HK$12.312
Each (In a Tube of 50)
units
19A SCR TO-220AB 1200V 180A Through Hole 28mA 1.5V 50mA 3 10.66mm 4.83mm 9.15mm 10.66 x 4.83 x 9.15mm
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. 135-8280
Mfr. Part No.CLA40P1200FC
BrandIXYS
HK$81.29
Each
units
40A SCR I4-Pac 1200V 700A Through Hole 80mA 1.6V 100mA 5 20.29mm 5.21mm 21.34mm 20.29 x 5.21 x 21.34mm
RS Stock No. 862-4904
Mfr. Part No.2N6400G
BrandLittelfuse
HK$10.697
Each (In a Pack of 10)
units
16A SCR TO-220AB 50V 160A Through Hole 60mA 2.5V 60mA 3 10.28mm 4.82mm 15.75mm 10.28 x 4.82 x 15.75mm
RS Stock No. 170-2399
Mfr. Part No.FS5030QP00TU
HK$23.508
Each (In a Tube of 30)
units
50A SCR TO-3P 1200V - Through Hole 80mA - - 3+Tab - - - -
RS Stock No. 918-9802
Mfr. Part No.VS-16TTS08-M3
BrandVishay
HK$22.918
Each (In a Tube of 50)
units
10A SCR TO-220AB 800V 200A Through Hole 90mA 3V 150mA 3 10.51mm 15.49mm 4.65mm 10.51 x 15.49 x 4.65mm
RS Stock No. 839-1379
Mfr. Part No.T560N12TOFXPSA1
BrandInfineon
HK$815.91
Each
units
559A PCT BG-T4814K0-1 1200V 7100A Stud 200mA 2V 300mA 5 - - 14.5mm 48 (Dia.) x 14.5 (Height)mm
RS Stock No. 168-4590
Mfr. Part No.MCO150-16IO1
BrandIXYS
HK$165.225
Each (In a Tube of 10)
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. 169-5882
Mfr. Part No.80RIA80PBF
BrandVishay
HK$266.72
Each (In a Bag of 25)
units
80A PCT TO-94 800V 1990A Thread Mount 120mA 2.5V 200mA 3 29.5mm 27mm 188mm 29.5 x 27 x 188mm
RS Stock No. 165-9922
Mfr. Part No.S8040R
BrandLittelfuse
HK$18.89
Each (On a Reel of 500)
units
40A SCR TO-220AB 400V 520A Through Hole 40000µA 1.5V 60mA 3 10.67mm 4.78mm 15.75mm 10.67 x 4.78 x 15.75mm
RS Stock No. 877-3071
Mfr. Part No.TYN612RG
HK$8.352
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. 169-5834
Mfr. Part No.16RIA120
BrandVishay
HK$46.919
Each (In a Bag of 100)
units
16A SCR TO-48 1200V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
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