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 Dimensions Diameter Maximum Operating Temperature Minimum Operating Temperature
RS Stock No. 168-9404
Mfr. Part No.BT151-500R,127
HK$3.781
Each (In a Tube of 50)
units
7.5A SCR TO-220AB 500V 132A Through Hole 15mA 1.5V 20mA 3 10.3 x 4.7 x 9.4mm - +125 °C -40 °C
RS Stock No. 509-566
Mfr. Part No.BT151-500R,127
HK$4.099
Each (In a Pack of 10)
units
7.5A SCR TO-220AB 500V 132A Through Hole 15mA 1.5V 20mA 3 10.3 x 4.7 x 9.4mm - +125 °C -40 °C
RS Stock No. 395-2831
Mfr. Part No.VS-22RIA40
BrandVishay
HK$122.56
Each
units
22A SCR TO-48 400V 420A Thread Mount 60mA 2V 130mA 2 - - +125 °C -65 °C
RS Stock No. 169-5899
Mfr. Part No.22RIA40
BrandVishay
HK$95.404
Each (In a Bag of 100)
units
22A SCR TO-48 400V 420A Thread Mount 60mA 2V 130mA 2 - - +125 °C -65 °C
RS Stock No. 862-4929
Mfr. Part No.2N6508G
BrandLittelfuse
HK$9.671
Each (In a Pack of 10)
units
16A SCR TO-220AB 600V 250A Through Hole 75mA 1.5V 80mA 3 10.28 x 4.82 x 15.75mm - +125 °C -40 °C
RS Stock No. 177-5212
Mfr. Part No.2N6508G
BrandLittelfuse
HK$10.116
Each (In a Box of 500)
units
16A SCR TO-220AB 600V 250A Through Hole 75mA 1.5V 80mA 3 10.28 x 4.82 x 15.75mm - +125 °C -40 °C
RS Stock No. 103-2939
Mfr. Part No.2N6507G
BrandLittelfuse
HK$10.298
Each (In a Box of 500)
units
16A SCR TO-220AB 400V 250A Through Hole 30mA 1.5V 40mA 3 10.28 x 4.82 x 9.28mm - +125 °C -40 °C
RS Stock No. 878-1653
Mfr. Part No.Q4016LH6
BrandLittelfuse
HK$11.134
Each (In a Pack of 500)
units
16A TRIAC TO-220 400V 200A Through Hole 80mA 1.3V 70mA 3 10.67 x 4.78 x 15.75mm - +125 °C -40 °C
RS Stock No. 544-9999
Mfr. Part No.2N6507G
BrandLittelfuse
HK$11.30
Each
units
16A SCR TO-220AB 400V 250A Through Hole 30mA 1.5V 40mA 3 10.28 x 4.82 x 9.28mm - +125 °C -40 °C
RS Stock No. 165-2437
Mfr. Part No.VS-ST083S08PFM1P
BrandVishay
HK$662.06
Each (In a Bag of 25)
units
85A SCR TO-94 800V 2560A Thread Mount 200mA 3V 600mA 3 29.5 (Dia.) x 191mm 29.5mm +125 °C -40 °C
RS Stock No. 357-3438
Mfr. Part No.VS-ST083S08PFM1P
BrandVishay
HK$806.19
Each
units
85A SCR TO-94 800V 2560A Thread Mount 200mA 3V 600mA 3 29.5 (Dia.) x 191mm 29.5mm +125 °C -40 °C
RS Stock No. 169-5838
Mfr. Part No.50RIA60
BrandVishay
HK$100.935
Each (In a Bag of 100)
units
50A SCR TO-65 600V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2 x 17.35 x 42.5mm - +125 °C -40 °C
RS Stock No. 145-1745
Mfr. Part No.VS-40TPS08-M3
BrandVishay
HK$48.472
Each (In a Tube of 25)
units
35A SCR TO-247AC 800V 600A Through Hole 150mA 2.5V 150mA 3 15.87 x 5.31 x 20.7mm - +125 °C -40 °C
RS Stock No. 395-3496
Mfr. Part No.VS-50RIA40
BrandVishay
HK$161.35
Each
units
50A SCR TO-65 400V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2 x 17.35 x 42.5mm - +125 °C -40 °C
RS Stock No. 357-5103
Mfr. Part No.VS-180RKI80PBF
BrandVishay
HK$501.24
Each
units
180A SCR TO-93 800V 4000A Thread Mount 150mA 2.5V 600mA 3 35 (Dia.) x 234.5mm 35mm +125 °C -40 °C
RS Stock No. 829-6858
Mfr. Part No.BTW69-1200N
HK$48.16
Each
units
31A SCR TOP3 1200V 763A Through Hole 50mA 1.3V 100mA 3 15.5 x 4.6 x 21.1mm - +125 °C -40 °C
RS Stock No. 145-1785
Mfr. Part No.VS-40TPS16-M3
BrandVishay
HK$62.14
Each (In a Tube of 25)
units
35A SCR TO-247AC 1600V 600A Through Hole 150mA 2.5V 150mA 3 15.87 x 5.31 x 20.7mm - +125 °C -40 °C
RS Stock No. 395-2875
Mfr. Part No.VS-25RIA60
BrandVishay
HK$124.50
Each
units
25A SCR TO-48 600V 440A Thread Mount 60mA 2V 130mA 2 - - +125 °C -65 °C
RS Stock No. 687-1053
Mfr. Part No.TYN610RG
HK$12.69
Each (In a Pack of 5)
units
6.4A SCR TO-220AB 600V 105A Through Hole 15mA 1.5V 30mA 3 10.4 x 4.6 x 9.15mm - +125 °C -40 °C
RS Stock No. 102-3580
Mfr. Part No.BTW69-1200RG
HK$53.324
Each (In a Tube of 30)
units
32A SCR TOP3 1200V 610A Through Hole 80mA 1.3V 150mA 3 15.5 x 4.6 x 12.85mm - +125 °C -40 °C
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