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. 687-1053
Mfr. Part No.TYN610RG
R 20.684
Each (In a Pack of 5)
units
6.4A SCR TO-220AB 600V 105A Through Hole 15mA 1.5V 30mA 3 10.4mm 4.6mm 9.15mm 10.4 x 4.6 x 9.15mm
RS stock no. 168-6673
Mfr. Part No.TYN610RG
R 17.52
Each (In a Tube of 50)
units
6.4A SCR TO-220AB 600V 105A Through Hole 15mA 1.5V 30mA 3 10.4mm 4.6mm 9.15mm 10.4 x 4.6 x 9.15mm
RS stock no. 168-8046
Mfr. Part No.TXN625RG
R 35.348
Each (In a Tube of 50)
units
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. 355-2841
Mfr. Part No.TS820-600T
R 26.11
Each
units
5A SCR TO-220AB 600V 73A Through Hole 0.2mA 0.8V 5mA 3 10.4mm 4.6mm 9.15mm 10.4 x 4.6 x 9.15mm
RS stock no. 102-4088
Mfr. Part No.TS820-600T
R 17.52
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 10.4 x 4.6 x 9.15mm
RS stock no. 829-0469
Mfr. Part No.TXN625RG
R 41.592
Each (In a Pack of 5)
units
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
R 103.09
Each
units
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. 165-5771
Mfr. Part No.BTW69-1200N
R 74.836
Each (In a Tube of 30)
units
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. 687-1019
Mfr. Part No.TYN640RG
R 37.30
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 10.4 x 4.6 x 9.15mm
RS stock no. 877-3071
Mfr. Part No.TYN612RG
R 19.247
Each (In a Pack of 10)
units
8A SCR TO-220AB 600V 145A Through Hole 200µA 0.8V 5mA 3 10.4mm 4.6mm 15.75mm 10.4 x 4.6 x 15.75mm
RS stock no. 168-7882
Mfr. Part No.BTW69-600RG
R 73.561
Each (In a Tube of 30)
units
- SCR TOP3 - - Through Hole - - - 3 15.5mm 4.6mm 21.1mm 15.5 x 4.6 x 21.1mm
RS stock no. 810-7392
Mfr. Part No.BTW69-600RG
R 99.99
Each
units
- SCR TOP3 - - Through Hole - - - 3 15.5mm 4.6mm 21.1mm 15.5 x 4.6 x 21.1mm
RS stock no. 168-6666
Mfr. Part No.TYN640RG
R 32.071
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 10.4 x 4.6 x 9.15mm
RS stock no. 168-8904
Mfr. Part No.TYN612RG
R 17.507
Each (In a Tube of 50)
units
8A SCR TO-220AB 600V 145A Through Hole 200µA 0.8V 5mA 3 10.4mm 4.6mm 15.75mm 10.4 x 4.6 x 15.75mm
RS stock no. 876-5755
Mfr. Part No.TS110-8UF
R 9.826
Each (In a Pack of 20)
units
0.8A SCR SMB 800V 21A Surface Mount 100µA 0.8V 12mA 3 4.6mm 3.95mm 1.1mm 4.6 x 3.95 x 1.1mm
RS stock no. 165-5286
Mfr. Part No.TS110-8UF
R 3.411
Each (On a Reel of 5000)
units
0.8A SCR SMB 800V 21A Surface Mount 100µA 0.8V 12mA 3 4.6mm 3.95mm 1.1mm 4.6 x 3.95 x 1.1mm
RS stock no. 168-8905
Mfr. Part No.TYN825RG
R 32.778
Each (In a Tube of 50)
units
16A SCR TO-220AB 800V 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. 168-6665
Mfr. Part No.TYN625RG
R 25.799
Each (In a Tube of 50)
units
16A SCR TO-220AB 600V 314A Through Hole 40mA 1.3V 50mA 3 10.4mm 4.6mm 9.15mm 10.4 x 4.6 x 9.15mm
RS stock no. 877-3074
Mfr. Part No.TYN825RG
R 38.872
Each (In a Pack of 5)
units
16A SCR TO-220AB 800V 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. 687-1016
Mfr. Part No.TYN625RG
R 28.745
Each (In a Pack of 2)
units
16A SCR TO-220AB 600V 314A Through Hole 40mA 1.3V 50mA 3 10.4mm 4.6mm 9.15mm 10.4 x 4.6 x 9.15mm