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. 509-550
Mfr. Part No.BT151-500C
PHP50.205
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7.5A SCR TO-220AB 500V 110A Through Hole 15mA 1.5V 20mA 3 10.3mm 4.7mm 9.4mm 10.3 x 4.7 x 9.4mm
RS Stock No. 146-1718
Mfr. Part No.DCR960G18
BrandDynex
PHP5,684.68
Each (In a Box of 7)
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960A SCR Type G 1800V 14000A Stud 300mA 3V 200mA 3 - - 26.5mm 58 (Dia.) x 26.5mm
RS Stock No. 760-9294
Mfr. Part No.DCR960G18
BrandDynex
PHP7,277.67
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960A SCR Type G 1800V 14000A Stud 300mA 3V 200mA 3 - - 26.5mm 58 (Dia.) x 26.5mm
RS Stock No. 768-9026
Mfr. Part No.N1718NC180
BrandIXYS
PHP11,796.14
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1718A PCT N1718 2000V 27200A Stud 300mA 3V 1000mA 2 - - 27.7mm 74 (Dia.) x 27.7mm
RS Stock No. 168-4652
Mfr. Part No.CS45-12IO1
BrandIXYS
PHP204.786
Each (In a Tube of 30)
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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. 168-4651
Mfr. Part No.CS45-08IO1
BrandIXYS
PHP195.572
Each (In a Tube of 30)
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48A SCR TO-247AD 800V 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. 877-3071
Mfr. Part No.TYN612RG
PHP32.416
Each (In a Pack of 10)
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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. 761-4000
Mfr. Part No.CS45-12io1
BrandIXYS
PHP241.33
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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. 761-3997
Mfr. Part No.CS45-08io1
BrandIXYS
PHP274.22
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48A SCR TO-247AD 800V 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. 169-6013
Mfr. Part No.VS-25TTS12PBF
BrandVishay
PHP100.64
Each (In a Tube of 50)
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16A SCR TO-220AB 1200V 350A Through Hole 45mA 2V 100mA 3 10.54mm 4.57mm 8.76mm 10.54 x 4.57 x 8.76mm
RS Stock No. 774-3451
Mfr. Part No.2N6404G
BrandLittelfuse
PHP65.695
Each (In a Pack of 2)
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10A SCR TO-220AB 600V 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. 169-5894
Mfr. Part No.16RIA100
BrandVishay
PHP282.07
Each (In a Bag of 100)
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16A SCR TO-48 1000V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
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. 102-3581
Mfr. Part No.BTW69-800RG
PHP259.84
Each (In a Tube of 30)
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32A SCR TOP3 800V 610A Through Hole 80mA 1.3V 150mA 3 15.5mm 4.6mm 12.85mm 15.5 x 4.6 x 12.85mm
RS Stock No. 177-5179
Mfr. Part No.2N6509TG
BrandLittelfuse
PHP64.60
Each (In a Tube of 50)
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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. 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
RS Stock No. 103-5140
Mfr. Part No.2N6404G
BrandLittelfuse
PHP34.493
Each (In a Box of 500)
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10A SCR TO-220AB 600V 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. 121-6890
Mfr. Part No.CR25RM-12D#B00
PHP210.12
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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
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. 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
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