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. 919-4375
Mfr. Part No.VS-30TPS12-M3
BrandVishay
kr 42,736
Each (In a Tube of 25)
Units
20A SCR TO-247AC 1200V 300A Through Hole 45mA 2V 100mA 3 15.87 x 5.31 x 20.7mm - +125 °C -40 °C
RS Stock No. 792-0715
Mfr. Part No.BT149G,412
kr 1,336
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Units
0.5A SCR TO-92 600V 9A Through Hole 200µA 0.8V 5mA 3 4.2 x 4.8 x 5.2mm - +125 °C -
RS Stock No. 166-0476
Mfr. Part No.BT148W-600R,115
kr 2,652
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. 905-6162
Mfr. Part No.SKT 551/16 E
BrandSemikron
kr 2 153,42
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391A SCR B 11 1600V 9000A Panel Mount 250 (Min)mA 3 (Min)V 500mA 3 41.5 (Dia.) x 14mm 41.5mm +125 °C -40 °C
RS Stock No. 379-8031
Mfr. Part No.VS-T90RIA120
BrandVishay
kr 364,60
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90A SCR D 55 1200V 1870A Panel Mount 120mA 2.5V 200mA 3 41 x 27 x 25mm - +125 °C -40 °C
RS Stock No. 227-9107
Mfr. Part No.VS-50RIA60
BrandVishay
kr 130,11
Each
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. 919-0199
Mfr. Part No.VS-25TTS08STRL-M3
BrandVishay
kr 10,464
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16A SCR D2PAK (TO-263) 800V 350A Surface Mount 45mA 2V 100mA 3 10.67 x 9.65 x 4.83mm - +125 °C -40 °C
RS Stock No. 687-0962
Mfr. Part No.X0202MN 5BA4
kr 6,96
Each (In a Pack of 5)
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0.8A SCR SOT-223 600V 25A Surface Mount 0.2mA 0.8V 5mA 3+Tab 6.5 x 3.5 x 1.8mm - +125 °C -40 °C
RS Stock No. 395-9214
Mfr. Part No.VS-T90RIA60
BrandVishay
kr 351,14
Each
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90A SCR D 55 600V 1870A Panel Mount 120mA 2.5V 200mA 3 41 x 27 x 25mm - +125 °C -40 °C
RS Stock No. 509-601
Mfr. Part No.BT258X-500R,127
kr 4,088
Each (In a Pack of 10)
Units
5A SCR TO-220F 500V 82A Through Hole 0.2mA 1.5V 6mA 3 10.3 x 4.6 x 9.3mm - +125 °C -40 °C
RS Stock No. 761-4000
Mfr. Part No.CS45-12io1
BrandIXYS
kr 49,35
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Units
48A SCR TO-247AD 1200V 560A Through Hole 200mA 1.6V 100mA 3 16.24 x 5.3 x 21.45mm - +140 °C -40 °C
RS Stock No. 708-4222
Mfr. Part No.VS-16TTS08-M3
BrandVishay
kr 41,97
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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. 178-7029
Mfr. Part No.S6065KTP
BrandLittelfuse
kr 41,152
Each (In a Tube of 250)
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65A SCR TO-218AC 600V 950A Through Hole 50mA 2V 80mA 3 16 x 4.78 x 21.21mm - +125 °C -40 °C
RS Stock No. 760-9294
Mfr. Part No.DCR960G18
BrandDynex
kr 1 632,39
Each
Units
960A SCR Type G 1800V 14000A Stud 300mA 3V 200mA 3 58 (Dia.) x 26.5mm - +125 °C -
RS Stock No. 878-1836
Mfr. Part No.S6016R
BrandLittelfuse
kr 11,954
Each (In a Pack of 10)
Units
16A SCR TO-220 600V 225A Through Hole 30mA 1.5V 40mA 3 10.67 x 4.78 x 15.75mm - +125 °C -40 °C
RS Stock No. 163-9738
Mfr. Part No.TN1605H-6G-TR
kr 3,66
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10A SCR D2PAK 600V 153A Surface Mount 6mA 1.3V 20mA 2 + Tab 10.28 x 9.35 x 4.6mm - +150 °C -40 °C
RS Stock No. 169-5883
Mfr. Part No.80RIA120PBF
BrandVishay
kr 290,944
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80A PCT TO-94 1200V 1990A Thread Mount 120mA 2.5V 200mA 3 29.5 x 27 x 188mm - +125 °C -40 °C
RS Stock No. 163-9787
Mfr. Part No.TN4015H-6I
kr 6,072
Each (In a Pack of 5)
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25A SCR TO-220AB 600V 394A Through Hole 15mA 1.3V 60mA 3 10.4 x 4.6 x 15.9mm - +150 °C -40 °C
RS Stock No. 486-5485
Mfr. Part No.P0111MN 5AA4
kr 0,848
Each (In a Pack of 5)
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0.5A SCR SOT-223 600V 8A Surface Mount 0.025mA 0.8V 5mA 3+Tab 6.5 x 3.5 x 1.8mm - +125 °C -40 °C
RS Stock No. 167-320
Mfr. Part No.VS-40TPS12-M3
BrandVishay
kr 78,36
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35A SCR TO-247AC 1200V 600A Through Hole 150mA 2.5V 150mA 3 15.87 x 5.31 x 20.7mm - +125 °C -40 °C
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