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. 839-1326
Mfr. Part No.TZ600N12KOFHPSA1
BrandInfineon
SGD263.22
Each
units
600A PCT BG-PB501-1 1200V 17000A Panel Mount 250mA 2.2V 300mA 5 101 x 50 x 52mm - +135 °C -40 °C
RS Stock No. 768-9017
Mfr. Part No.N0910LC200-U9900
BrandIXYS
SGD320.49
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910A PCT N0910 2000V 9200A Stud 300mA 3V 1000mA 2 58.5 (Dia.) x 27mm 58.5mm +125 °C -40 °C
RS Stock No. 687-1022
Mfr. Part No.X0405MF 1AA2
SGD0.94
Each (In a Pack of 10)
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0.9A SCR TO-202 600V 33A Through Hole 0.05mA 0.8V 5mA 3 10.1 x 4.5 x 7.3mm - +125 °C -40 °C
RS Stock No. 829-0683
Mfr. Part No.BTW68-1200RG
SGD9.17
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19A SCR TOP3 1200V 420A Through Hole 50mA 1.5V 75mA 3 15.5 x 4.6 x 21.1mm - +125 °C -40 °C
RS Stock No. 166-0476
Mfr. Part No.BT148W-600R,115
SGD0.352
Each (On a Reel of 1000)
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0.6A SCR SOT-223 (SC-73) 600V 11A Surface Mount 0.2mA 1.5V 6mA 4 6.7 x 3.7 x 1.7mm - +125 °C -40 °C
RS Stock No. 145-9467
Mfr. Part No.X0403MF 1AA2
SGD0.931
Each (In a Bag of 250)
units
4A SCR TO-202 600V 33A Through Hole - 0.8V 5mA 3 10.1 x 4.5 x 7.3mm - +125 °C -40 °C
RS Stock No. 714-2643
Mfr. Part No.BTW69-800RG
SGD10.60
Each
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32A SCR TOP3 800V 610A Through Hole 80mA 1.3V 150mA 3 15.5 x 4.6 x 12.85mm - +125 °C -40 °C
RS Stock No. 905-6037
Mfr. Part No.SKT 24/12 E
BrandSemikron
SGD28.89
Each
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22A SCR B 2 1200V 450A Thread Mount 100 (Min)mA 3 (Min)V 150mA 3 14 (Dia.) x 41mm 14mm +130 °C -40 °C
RS Stock No. 792-0718
Mfr. Part No.BT151S-800R,118
SGD0.821
Each (In a Pack of 10)
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7.5A SCR DPAK (TO-252) 800V 132A Surface Mount 15mA 1.5V 20mA 3 6.73 x 6.22 x 2.38mm - +125 °C -
RS Stock No. 178-1397
Mfr. Part No.BTW68-1200RG
SGD8.40
Each (In a Tube of 30)
units
19A SCR TOP3 1200V 420A Through Hole 50mA 1.5V 75mA 3 15.5 x 4.6 x 21.1mm - +125 °C -40 °C
RS Stock No. 877-2655
Mfr. Part No.BTW67-1000
SGD10.44
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32A SCR RD91 1000V 610A Panel Mount 80mA 1.3V 150mA 3 40 x 27 x 14mm - +125 °C -40 °C
RS Stock No. 165-2846
Mfr. Part No.VS-ST230S08P0VPBF
BrandVishay
SGD93.032
Each (In a Bag of 12)
units
230A SCR TO-93 800V 5970A Thread Mount 150mA 3V 600mA 3 35 x 30.33 x 49.5mm - +125 °C -40 °C
RS Stock No. 774-3451
Mfr. Part No.2N6404G
BrandLittelfuse
SGD2.13
Each (In a Pack of 2)
units
10A SCR TO-220AB 600V 160A Through Hole 60mA 2.5V 60mA 3 10.28 x 4.82 x 15.75mm - +125 °C -40 °C
RS Stock No. 166-1581
Mfr. Part No.BT151S-650R,118
SGD0.74
Each (On a Reel of 2500)
units
7.5A SCR DPAK (TO-252) 650V 132A Surface Mount 15mA 1.5V 20mA 3 6.73 x 6.22 x 2.38mm - +125 °C -40 °C
RS Stock No. 103-2939
Mfr. Part No.2N6507G
BrandLittelfuse
SGD2.293
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. 793-1939
Mfr. Part No.S6X8BSRP
BrandLittelfuse
SGD0.586
Each (In a Pack of 10)
units
0.8A SCR SOT-89 600V 10A Surface Mount 200µA 0.8V 5mA 3 4.6 x 2.6 x 1.6mm - +125 °C -40 °C
RS Stock No. 177-5202
Mfr. Part No.C106MG
BrandLittelfuse
SGD0.414
Each (In a Box of 500)
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2.55A SCR TO-225AA 600V 20A Through Hole 500µA 1V 6mA 3 7.74 x 2.66 x 11.04mm - +110 °C -40 °C
RS Stock No. 168-6080
Mfr. Part No.TS420-600T
SGD1.441
Each (In a Tube of 50)
units
2.5A SCR TO-220AB 600V 33A Through Hole 0.2mA 0.8V 5mA 3 10.4 x 4.6 x 9.15mm - +125 °C -40 °C
RS Stock No. 708-4222
Mfr. Part No.VS-16TTS08-M3
BrandVishay
SGD7.35
Each
units
10A SCR TO-220AC 800V 200A Through Hole 60mA 2V 100mA 3 10.54 x 4.57 x 8.76mm - +125 °C -40 °C
RS Stock No. 165-6811
Mfr. Part No.X0202MA 1BA2
SGD0.307
Each (On a Reel of 2500)
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1.25A SCR TO-92 600V 25A Through Hole 200µA 0.8V 5mA 3 4.7 x 3.7 x 4.4mm - +125 °C -40 °C
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