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. 919-4404
Mfr. Part No.VS-40TPS12A-M3
BrandVishay
PHP187.053
Each (In a Tube of 25)
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. 878-1811
Mfr. Part No.SK025L
BrandLittelfuse
PHP97.174
Each (In a Pack of 10)
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25A SCR TO-220 1000V 300A Through Hole 35mA 1.5V 50mA 3 10.67mm 4.78mm 15.75mm 10.67 x 4.78 x 15.75mm
RS Stock No. 760-9272
Mfr. Part No.DCR780E14
BrandDynex
PHP4,090.53
Each
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780A SCR Type G 1400V 9100A Stud 300mA 3V 200mA 3 - - 14.5mm 42 (Dia.) x 14.5mm
RS Stock No. 103-2940
Mfr. Part No.2N6509G
BrandLittelfuse
PHP58.788
Each (In a Box of 500)
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16A SCR TO-220AB 800V 250A Through Hole 30mA 1.5V 40mA 3 10.28mm 4.82mm 9.28mm 10.28 x 4.82 x 9.28mm
RS Stock No. 862-4957
Mfr. Part No.MCR72-3G
BrandLittelfuse
PHP45.132
Each (In a Pack of 10)
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8A SCR TO-220AB 100V 100A Through Hole 200mA 1.5V 6mA 3 10.53mm 4.83mm 15.75mm 10.53 x 4.83 x 15.75mm
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Mfr. Part No.CR25RM-12D#B00
PHP210.12
Each (In a Pack of 2)
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25A SCR TO-3PFM 600V 360A Through Hole 30mA 1.5V 15mA 3 15.6mm 5.5mm 19.9mm 15.6 x 5.5 x 19.9mm
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Mfr. Part No.2N6509TG
BrandLittelfuse
PHP64.60
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- SCR TO-220 800V 250A Through Hole 75mA 1.5V 80mA 3 10.28mm 4.82mm 15.75mm 10.28 x 4.82 x 15.75mm
RS Stock No. 395-2724
Mfr. Part No.VS-16RIA100
BrandVishay
PHP514.60
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16A SCR TO-48 1000V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 436-8114
Mfr. Part No.BT152-800R
PHP43.306
Each (In a Pack of 5)
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13A SCR TO-220AB 800V 220A Through Hole 32mA 1.5V 60mA 3 10.3mm 4.7mm 9.4mm 10.3 x 4.7 x 9.4mm
RS Stock No. 170-2391
Mfr. Part No.FS0402MH TU
PHP18.02
Each (In a Tube of 50)
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4A SCR TO-220AB 600V 30 A @ 50 Hz, 33 A @ 60 Hz Through Hole 200µA 0.8V 5mA 3 10.36mm 4.67mm 15.35mm 10.36 x 4.67 x 15.35mm
RS Stock No. 301-619
Mfr. Part No.VS-40TPS12A-M3
BrandVishay
PHP327.59
Each
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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. 905-6037
Mfr. Part No.SKT 24/12 E
BrandSemikron
PHP912.87
Each
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22A SCR B 2 1200V 450A Thread Mount 100 (Min)mA 3 (Min)V 150mA 3 - - 41mm 14 (Dia.) x 41mm
RS Stock No. 760-9275
Mfr. Part No.DCR950D14
BrandDynex
PHP4,219.00
Each
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950A SCR Type G 1400V 12800A Stud 300mA 3V 200mA 3 - - 14.5mm 47 (Dia.) x 14.5mm
RS Stock No. 124-5420
Mfr. Part No.NYC0102BLT1G
BrandLittelfuse
PHP5.985
Each (On a Reel of 3000)
units
0.25A SCR SOT-23 200V 7A Surface Mount 200µA 0.8V 6mA 3 2.9mm 1.3mm 0.94mm 2.9 x 1.3 x 0.94mm
RS Stock No. 708-4446
Mfr. Part No.VS-40TPS16-M3
BrandVishay
PHP258.99
Each
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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. 177-5217
Mfr. Part No.MCR72-3G
BrandLittelfuse
PHP31.311
Each (In a Box of 500)
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8A SCR TO-220AB 100V 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. 817-2453
Mfr. Part No.VS-50RIA20
BrandVishay
PHP706.65
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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
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Mfr. Part No.BT258X-500R
PHP30.06
Each (In a Tube of 50)
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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
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PHP29.24
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2.5A SCR SOT-82 600V 38A Through Hole 0.2mA 1.5V 6mA 3 7.8mm 2.8mm 11.1mm 7.8 x 2.8 x 11.1mm
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Mfr. Part No.CS23-12IO2
BrandIXYS
PHP1,057.397
Each (In a Tube of 10)
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32A SCR TO-208AA 1200V 480A Thread Mount 50mA 2.5V 100mA 3 15.7mm 14mm 39.5mm 15.7 x 14 x 39.5mm
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