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. 919-4384
Mfr. Part No.VS-30TPS16-M3
BrandVishay
PHP86.479
Each (In a Tube of 25)
units
20A SCR TO-247AC 1600V 300A Through Hole 45mA 2V 100mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 124-1122
Mfr. Part No.TM8050H-8W
PHP267.41
Each (In a Pack of 2)
units
50A SCR TO-247 800V 731A Through Hole 50mA 1.5V 100mA 3 15.75mm 5.15mm 20.15mm 15.75 x 5.15 x 20.15mm
RS Stock No. 545-0220
Mfr. Part No.MCR8NG
BrandLittelfuse
PHP47.60
Each
units
- SCR TO-220AB 800V 80A Through Hole 15mA 1V 30mA 3 10.28mm 4.82mm 9.28mm 10.28 x 4.82 x 9.28mm
RS Stock No. 878-1782
Mfr. Part No.L6008D8TP
BrandLittelfuse
PHP49.498
Each (In a Pack of 750)
units
8A - DPAK (TO-252) 600V 85A Surface Mount 10 mA, 20 mA 1.3V 20mA 3 6.73mm 6.22mm 2.41mm 6.73 x 6.22 x 2.41mm
RS Stock No. 509-443
Mfr. Part No.BT151S-650R
PHP17.082
Each (In a Pack of 10)
units
7.5A SCR DPAK (TO-252) 650V 132A Surface Mount 15mA 1.5V 20mA 3 6.73mm 6.22mm 2.38mm 6.73 x 6.22 x 2.38mm
RS Stock No. 817-2453
Mfr. Part No.VS-50RIA20
BrandVishay
PHP706.65
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80A SCR TO-65 200V 1490A Thread Mount 250mA 3.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 168-8046
Mfr. Part No.TXN625RG
PHP91.08
Each (In a Tube of 50)
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16A SCR TO-220AB 600V 314A Through Hole 40mA 1.3V 50mA 3 10.4mm 4.6mm 15.9mm 10.4 x 4.6 x 15.9mm
RS Stock No. 829-6858
Mfr. Part No.BTW69-1200N
PHP306.78
Each
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31A SCR TOP3 1200V 763A Through Hole 50mA 1.3V 100mA 3 15.5mm 4.6mm 21.1mm 15.5 x 4.6 x 21.1mm
RS Stock No. 103-7558
Mfr. Part No.BT151-650R,127
PHP17.313
Each (In a Tube of 50)
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7.5A SCR TO-220AB 650V 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. 829-0469
Mfr. Part No.TXN625RG
PHP100.982
Each (In a Pack of 5)
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16A SCR TO-220AB 600V 314A Through Hole 40mA 1.3V 50mA 3 10.4mm 4.6mm 15.9mm 10.4 x 4.6 x 15.9mm
RS Stock No. 178-5036
Mfr. Part No.BT148-600R
PHP16.49
Each (In a Tube of 120)
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2.5A SCR SOT-82 600V 38A Through Hole 0.2mA 1.5V 6mA 3 7.8mm 2.8mm 11.1mm 7.8 x 2.8 x 11.1mm
RS Stock No. 700-5119
Mfr. Part No.VS-VSKT91/16
BrandVishay
PHP2,114.46
Each
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95A SCR TO-240AA 1600V 2094A Panel Mount 270mA 4V 250mA 7 92mm 22.6mm 30mm 92 x 22.6 x 30mm
RS Stock No. 165-2790
Mfr. Part No.VS-111RKI120PBF
BrandVishay
PHP2,130.117
Each (In a Bag of 25)
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110A PCT TO-94 1200V 2180A Thread Mount 120mA 2V 200mA 3 29.5mm 27mm 188mm 29.5 x 27 x 188mm
RS Stock No. 103-8143
Mfr. Part No.BT152-600R
PHP36.146
Each (In a Tube of 50)
units
13A SCR TO-220AB 650V 220A Through Hole 32mA 1.5V 60mA 3 10.3mm 4.7mm 9.4mm 10.3 x 4.7 x 9.4mm
RS Stock No. 300-420
Mfr. Part No.VS-30TPS16PBF
BrandVishay
PHP105.46
Each
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20A SCR TO-247AC 1600V 300A Through Hole 45mA 2V 100mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 165-2992
Mfr. Part No.VSKT91/16
BrandVishay
PHP2,903.30
Each (In a Box of 10)
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95A SCR TO-240AA 1600V 2094A Panel Mount 270mA 4V 250mA 7 92mm 22.6mm 30mm 92 x 22.6 x 30mm
RS Stock No. 178-1396
Mfr. Part No.TM8050H-8W
PHP227.099
Each (In a Tube of 30)
units
50A SCR TO-247 800V 731A Through Hole 50mA 1.5V 100mA 3 15.75mm 5.15mm 20.15mm 15.75 x 5.15 x 20.15mm
RS Stock No. 905-6046
Mfr. Part No.SKT 24/16 E
BrandSemikron
PHP747.35
Each
units
22A SCR - 1600V 450A Thread Mount 100 (Min)A 3 (Min)V 150mA 3 - - 41mm 14 (Dia.) x 41mm
RS Stock No. 905-6074
Mfr. Part No.SKT 16/16 E
BrandSemikron
PHP945.88
Each
units
18A SCR A 46 1600V 2000A Thread Mount 150 (Min)mA 3 (Min)V 250mA 7 93mm 20mm 30mm 93 x 20 x 30mm
RS Stock No. 166-0389
Mfr. Part No.BT169G,112
PHP3.742
Each (In a Bag of 1000)
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0.5A SCR SPT 600V 9A Through Hole 0.2mA 0.8V 5mA 3 4.8mm 4.2mm 5.2mm 4.8 x 4.2 x 5.2mm
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