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. 171-0139
Mfr. Part No.MCR8SDG
BrandLittelfuse
€1.06
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. 808-3996
Mfr. Part No.MCR8SDG
BrandLittelfuse
€1.166
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. 177-5179
Mfr. Part No.2N6509TG
BrandLittelfuse
€1.93
Each (In a Tube of 50)
units
- 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. 545-0006
Mfr. Part No.2N6509G
BrandLittelfuse
€2.40
Each
units
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. 800-9200
Mfr. Part No.2N6509TG
BrandLittelfuse
€2.123
Each (In a Pack of 10)
units
- 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. 103-2940
Mfr. Part No.2N6509G
BrandLittelfuse
€1.35
Each (In a Box of 500)
units
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. 793-1923
Mfr. Part No.S4065JTP
BrandLittelfuse
€3.24
Each
units
65A SCR TO-218X 400V 950A Through Hole 50mA 2V 80mA 3 16mm 4.78mm 21.21mm 16 x 4.78 x 21.21mm
RS Stock No. 178-7030
Mfr. Part No.S4065JTP
BrandLittelfuse
€3.139
Each (In a Tube of 250)
units
65A SCR TO-218X 400V 950A Through Hole 50mA 2V 80mA 3 16mm 4.78mm 21.21mm 16 x 4.78 x 21.21mm
RS Stock No. 774-3460
Mfr. Part No.C106MG
BrandLittelfuse
€0.409
Each (In a Pack of 10)
units
2.55A SCR TO-225AA 600V 20A Through Hole 500µA 1V 6mA 3 7.74mm 2.66mm 11.04mm 7.74 x 2.66 x 11.04mm
RS Stock No. 103-5140
Mfr. Part No.2N6404G
BrandLittelfuse
€0.468
Each (In a Box of 500)
units
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. 177-5202
Mfr. Part No.C106MG
BrandLittelfuse
€0.27
Each (In a Box of 500)
units
2.55A SCR TO-225AA 600V 20A Through Hole 500µA 1V 6mA 3 7.74mm 2.66mm 11.04mm 7.74 x 2.66 x 11.04mm
RS Stock No. 774-3451
Mfr. Part No.2N6404G
BrandLittelfuse
€0.505
Each (In a Pack of 2)
units
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. 177-5210
Mfr. Part No.2N6405G
BrandLittelfuse
€0.46
Each (In a Box of 500)
units
10A SCR TO-220AB 800V 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. 544-9999
Mfr. Part No.2N6507G
BrandLittelfuse
€2.43
Each
units
16A SCR TO-220AB 400V 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. 876-8509
Mfr. Part No.S6008LS3
BrandLittelfuse
€1.22
Each (In a Pack of 10)
units
8A SCR TO-220 600V 100A Through Hole 500µA 0.8V 8mA 3 10.67mm 4.78mm 15.75mm 10.67 x 4.78 x 15.75mm
RS Stock No. 862-4916
Mfr. Part No.2N6405G
BrandLittelfuse
€0.48
Each (In a Pack of 10)
units
10A SCR TO-220AB 800V 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. 878-1772
Mfr. Part No.L6008L6
BrandLittelfuse
€1.175
Each (In a Pack of 500)
units
8A - TO-220 600V 85A Through Hole 5 mA, 10 mA 1.3V 10mA 3 10.67mm 4.78mm 15.75mm 10.67 x 4.78 x 15.75mm
RS Stock No. 103-2939
Mfr. Part No.2N6507G
BrandLittelfuse
€1.369
Each (In a Box of 500)
units
16A SCR TO-220AB 400V 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. 774-3467
Mfr. Part No.C106DG
BrandLittelfuse
€0.431
Each (In a Pack of 10)
units
2.55A SCR TO-225AA 400V 20A Through Hole 500µA 1V 6mA 3 7.74mm 2.66mm 11.04mm 7.74 x 2.66 x 11.04mm
RS Stock No. 124-5420
Mfr. Part No.NYC0102BLT1G
BrandLittelfuse
€0.097
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