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. 808-3996
Mfr. Part No.MCR8SDG
BrandLittelfuse
PHP40.751
Each (In a Pack of 20)
units
8A SCR TO-220AB 400V 80A Through Hole 200µA 1.5V 6mA 3 10.28mm 4.82mm 15.75mm 10.28 x 4.82 x 15.75mm
RS Stock No. 171-0139
Mfr. Part No.MCR8SDG
BrandLittelfuse
PHP38.695
Each (In a Tube of 50)
units
8A SCR TO-220AB 400V 80A Through Hole 200µA 1.5V 6mA 3 10.28mm 4.82mm 15.75mm 10.28 x 4.82 x 15.75mm
RS Stock No. 168-6662
Mfr. Part No.TYN1225RG
PHP127.109
Each (In a Tube of 50)
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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. 687-1000
Mfr. Part No.TYN1225RG
PHP140.75
Each
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. 395-3474
Mfr. Part No.VS-50RIA120
BrandVishay
PHP1,186.22
Each
units
50A SCR TO-65 1200V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 862-4929
Mfr. Part No.2N6508G
BrandLittelfuse
PHP60.979
Each (In a Pack of 10)
units
16A SCR TO-220AB 600V 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. 165-2391
Mfr. Part No.VS-50RIA120
BrandVishay
PHP499.74
Each (In a Bag of 100)
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50A SCR TO-65 1200V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 177-5212
Mfr. Part No.2N6508G
BrandLittelfuse
PHP62.02
Each (In a Box of 500)
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16A SCR TO-220AB 600V 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. 509-566
Mfr. Part No.BT151-500R,127
PHP23.664
Each (In a Pack of 10)
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7.5A SCR TO-220AB 500V 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. 905-6178
Mfr. Part No.SKT 1200/16 E
BrandSemikron
PHP12,263.38
Each
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840A SCR B 14 1600V 30000A Panel Mount 250 (Min)mA 3 (Min)V 500mA 3 - - 26mm 74 (Dia.) x 26mm
RS Stock No. 168-9404
Mfr. Part No.BT151-500R,127
PHP23.20
Each (In a Tube of 50)
units
7.5A SCR TO-220AB 500V 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. 760-9279
Mfr. Part No.DCR1010G14
BrandDynex
PHP5,456.09
Each
units
1010A SCR Type G 1400V 15000A Stud 300mA 3V 200mA 3 - - 26.5mm 58 (Dia.) x 26.5mm
RS Stock No. 168-4648
Mfr. Part No.DCR1010G14
BrandDynex
PHP7,666.571
Each (In a Box of 7)
units
1010A SCR Type G 1400V 15000A Stud 300mA 3V 200mA 3 - - 26.5mm 58 (Dia.) x 26.5mm
RS Stock No. 169-5896
Mfr. Part No.16RIA40
BrandVishay
PHP282.07
Each (In a Bag of 100)
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16A SCR TO-48 400V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 145-9590
Mfr. Part No.X0405MF 1AA2
PHP13.059
Each (In a Bag of 250)
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0.9A SCR TO-202 600V 33A Through Hole 0.05mA 0.8V 5mA 3 10.1mm 4.5mm 7.3mm 10.1 x 4.5 x 7.3mm
RS Stock No. 509-471
Mfr. Part No.BT169D
PHP14.383
Each (In a Pack of 50)
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0.5A SCR SPT 400V 9A Through Hole 0.2mA 0.8V 5mA 3 4.8mm 4.2mm 5.2mm 4.8 x 4.2 x 5.2mm
RS Stock No. 687-1022
Mfr. Part No.X0405MF 1AA2
PHP28.099
Each (In a Pack of 10)
units
0.9A SCR TO-202 600V 33A Through Hole 0.05mA 0.8V 5mA 3 10.1mm 4.5mm 7.3mm 10.1 x 4.5 x 7.3mm
RS Stock No. 395-2730
Mfr. Part No.VS-16RIA40
BrandVishay
PHP693.32
Each
units
16A SCR TO-48 400V 360A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 166-1424
Mfr. Part No.BT169D
PHP3.742
Each (In a Bag of 1000)
units
0.5A SCR SPT 400V 9A Through Hole 0.2mA 0.8V 5mA 3 4.8mm 4.2mm 5.2mm 4.8 x 4.2 x 5.2mm
RS Stock No. 509-550
Mfr. Part No.BT151-500C
PHP50.205
Each (In a Pack of 10)
units
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
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