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. 168-8046
Mfr. Part No.TXN625RG
PHP119.567
Each (In a Tube of 50)
units
16A SCR TO-220AB 600V 314A Through Hole 40mA 1.3V 50mA 3 10.4 x 4.6 x 15.9mm - +125 °C -40 °C
RS Stock No. 829-6858
Mfr. Part No.BTW69-1200N
PHP285.30
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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. 768-9013
Mfr. Part No.N0910LC260-U9900
BrandIXYS
PHP13,141.26
Each
units
910A PCT N0910 2600V 9200A Stud 300mA 3V 1000mA 2 58.5 (Dia.) x 27mm 58.5mm +125 °C -40 °C
RS Stock No. 485-4299
Mfr. Part No.BT169G,112
PHP13.766
Each (In a Pack of 25)
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0.5A SCR SPT 600V 9A Through Hole 0.2mA 0.8V 5mA 3 4.8 x 4.2 x 5.2mm - +125 °C -40 °C
RS Stock No. 905-6074
Mfr. Part No.SKT 16/16 E
BrandSemikron
PHP1,385.17
Each
units
18A SCR A 46 1600V 2000A Thread Mount 150 (Min)mA 3 (Min)V 250mA 7 93 x 20 x 30mm - +125 °C -40 °C
RS Stock No. 300-420
Mfr. Part No.VS-30TPS16PBF
BrandVishay
PHP170.15
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20A SCR TO-247AC 1600V 300A Through Hole 45mA 2V 100mA 3 15.87 x 5.31 x 20.7mm - +125 °C -40 °C
RS Stock No. 878-1842
Mfr. Part No.SK055R
BrandLittelfuse
PHP125.807
Each (In a Pack of 500)
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55A SCR TO-220 1000V 650A Through Hole 40mA 1.5V 60mA 3 10.67 x 4.78 x 15.75mm - +125 °C -40 °C
RS Stock No. 166-0389
Mfr. Part No.BT169G,112
PHP4.36
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0.5A SCR SPT 600V 9A Through Hole 0.2mA 0.8V 5mA 3 4.8 x 4.2 x 5.2mm - +125 °C -40 °C
RS Stock No. 178-5036
Mfr. Part No.BT148-600R,127
PHP15.077
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 7.8 x 2.8 x 11.1mm - +125 °C -40 °C
RS Stock No. 124-1122
Mfr. Part No.TM8050H-8W
PHP250.665
Each (In a Pack of 2)
units
50A SCR TO-247 800V 731A Through Hole 50mA 1.5V 100mA 3 15.75 x 5.15 x 20.15mm - +150 °C -40 °C
RS Stock No. 700-5639
Mfr. Part No.VS-ST380CH06C1
BrandVishay
PHP9,215.30
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960A PCT TO-200AB 600V 13000A Screw Mount 200mA 3V 600mA 3 42 x 42 x 15.1mm - +150 °C -40 °C
RS Stock No. 166-1323
Mfr. Part No.BT168GW,115
PHP10.619
Each (On a Reel of 1000)
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0.63A SCR SOT-223 (SC-73) 600V 9A Surface Mount 0.2mA 0.8V 5mA 4 6.7 x 3.7 x 1.7mm - +125 °C -40 °C
RS Stock No. 839-1313
Mfr. Part No.TZ425N16KOFHPSA1
BrandInfineon
PHP7,652.38
Each
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425A PCT BG-PB501-1 1600V 14500A Panel Mount 250mA 1.5V 300mA 5 101 x 50 x 52mm - +125 °C -40 °C
RS Stock No. 188-8524
Mfr. Part No.TN2540-600G-TR
PHP112.85
Each (In a Pack of 5)
units
25A SCR D2PAK - 314A Surface Mount 40mA - 50mA 3 10.28 x 9.35 x 4.37mm - +125 °C -40 °C
RS Stock No. 125-8053
Mfr. Part No.MCO150-16io1
BrandIXYS
PHP1,008.91
Each
units
158A - SOT-227B 1600V 2.16kA Screw 200mA 1.6V 200mA 4 38.23 x 25.25 x 12.22mm - +125 °C -40 °C
RS Stock No. 110-6563
Mfr. Part No.TN1205T-600B-TR
PHP72.828
Each (In a Pack of 10)
units
8A SCR DPAK (TO-252) 600V 120A Surface Mount 5mA 1.3V 15mA 3+Tab 6.6 x 6.2 x 2.4mm - +125 °C -40 °C
RS Stock No. 165-9922
Mfr. Part No.S8040R
BrandLittelfuse
PHP106.125
Each (On a Reel of 500)
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40A SCR TO-220AB 400V 520A Through Hole 40000µA 1.5V 60mA 3 10.67 x 4.78 x 15.75mm - +125 °C -40 °C
RS Stock No. 168-6665
Mfr. Part No.TYN625RG
PHP72.98
Each (In a Tube of 50)
units
16A SCR TO-220AB 600V 314A Through Hole 40mA 1.3V 50mA 3 10.4 x 4.6 x 9.15mm - +125 °C -40 °C
RS Stock No. 700-5576
Mfr. Part No.VS-181RKI40PBF
BrandVishay
PHP3,518.95
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180A PCT TO-93 400V 4000A Thread Mount 150mA 2.5V 600mA 3 35 x 30.33 x 49.5mm - +125 °C -40 °C
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PHP69.15
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5A SCR TO-220AB 600V 73A Through Hole 0.2mA 0.8V 5mA 3 10.4 x 4.6 x 9.15mm - +125 °C -40 °C
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