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 PRICED TO CLEAR 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
RS Stock No. 168-9404
Mfr. Part No.BT151-500R,127
£0.372
Each (In a Tube of 50)
Units
- 7.5A SCR TO-220AB 500V 132A Through Hole 15mA 1.5V 20mA 3 10.3mm 4.7mm 9.4mm
RS Stock No. 509-566
Mfr. Part No.BT151-500R,127
£0.41
Each (In a Pack of 10)
Units
- 7.5A SCR TO-220AB 500V 132A Through Hole 15mA 1.5V 20mA 3 10.3mm 4.7mm 9.4mm
RS Stock No. 165-2391
Mfr. Part No.VS-50RIA120
BrandVishay
£14.20
Each (In a Bag of 100)
Units
- 50A SCR TO-65 1200V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2mm 17.35mm 42.5mm
RS Stock No. 395-3474
Mfr. Part No.VS-50RIA120
BrandVishay
£17.98
Each
Units
- 50A SCR TO-65 1200V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2mm 17.35mm 42.5mm
RS Stock No. 262-488
Mfr. Part No.BT152-600R
£0.79
Each
Units
- 13A SCR TO-220AB 650V 220A Through Hole 32mA 1.5V 60mA 3 10.3mm 4.7mm 9.4mm
RS Stock No. 920-0751
Mfr. Part No.CS23-12IO2
BrandIXYS
£20.707
Each (In a Tube of 10)
Units
- 32A SCR TO-208AA 1200V 480A Thread Mount 50mA 2.5V 100mA 3 15.7mm 14mm 39.5mm
RS Stock No. 194-372
Mfr. Part No.CS23-12IO2
BrandIXYS
£23.74
Each
Units
- 32A SCR TO-208AA 1200V 480A Thread Mount 50mA 2.5V 100mA 3 15.7mm 14mm 39.5mm
RS Stock No. 545-0006
Mfr. Part No.2N6509G
BrandLittelfuse
£2.21
Each
Units
- 16A SCR TO-220AB 800V 250A Through Hole 30mA 1.5V 40mA 3 10.28mm 4.82mm 9.28mm
RS Stock No. 177-5179
Mfr. Part No.2N6509TG
BrandLittelfuse
£1.774
Each (In a Tube of 50)
Units
- - SCR TO-220 800V 250A Through Hole 75mA 1.5V 80mA 3 10.28mm 4.82mm 15.75mm
RS Stock No. 484-2864
Mfr. Part No.BT151-800R
£0.588
Each (In a Pack of 5)
Units
- 7.5A SCR TO-220AB 800V 132A Through Hole 15mA 1.5V 20mA 3 10.3mm 4.7mm 9.4mm
RS Stock No. 103-2940
Mfr. Part No.2N6509G
BrandLittelfuse
£1.245
Each (In a Box of 500)
Units
- 16A SCR TO-220AB 800V 250A Through Hole 30mA 1.5V 40mA 3 10.28mm 4.82mm 9.28mm
RS Stock No. 800-9200
Mfr. Part No.2N6509TG
BrandLittelfuse
£1.951
Each (In a Pack of 10)
Units
- - SCR TO-220 800V 250A Through Hole 75mA 1.5V 80mA 3 10.28mm 4.82mm 15.75mm
RS Stock No. 687-1019
Mfr. Part No.TYN640RG
£2.105
Each (In a Pack of 2)
Units
- 25A SCR TO-220AB 600V 480A Through Hole 35mA 1.3V 75mA 3 10.4mm 4.6mm 9.15mm
RS Stock No. 168-6666
Mfr. Part No.TYN640RG
£1.793
Each (In a Tube of 50)
Units
- 25A SCR TO-220AB 600V 480A Through Hole 35mA 1.3V 75mA 3 10.4mm 4.6mm 9.15mm
RS Stock No. 436-8114
Mfr. Part No.BT152-800R
£0.912
Each (In a Pack of 5)
Units
- 13A SCR TO-220AB 800V 220A Through Hole 32mA 1.5V 60mA 3 10.3mm 4.7mm 9.4mm
RS Stock No. 102-4088
Mfr. Part No.TS820-600T
£0.99
Each (In a Tube of 50)
Units
- 5A SCR TO-220AB 600V 73A Through Hole 0.2mA 0.8V 5mA 3 10.4mm 4.6mm 9.15mm
RS Stock No. 768-9026
Mfr. Part No.N1718NC180
BrandIXYS
£209.99
Each
Units
- 1718A PCT N1718 2000V 27200A Stud 300mA 3V 1000mA 2 - - 27.7mm
RS Stock No. 355-2841
Mfr. Part No.TS820-600T
£2.00
Each
Units
- 5A SCR TO-220AB 600V 73A Through Hole 0.2mA 0.8V 5mA 3 10.4mm 4.6mm 9.15mm
RS Stock No. 379-8031
Mfr. Part No.VS-T90RIA120
BrandVishay
£31.93
Each
Units
- 90A SCR D 55 1200V 1870A Panel Mount 120mA 2.5V 200mA 3 41mm 27mm 25mm
RS Stock No. 165-2605
Mfr. Part No.VS-T90RIA120
BrandVishay
£29.312
Each (In a Box of 10)
Units
- 90A SCR D 55 1200V 1870A Panel Mount 120mA 2.5V 200mA 3 41mm 27mm 25mm
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