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. 103-2939
Mfr. Part No.2N6507G
BrandLittelfuse
€0.95
Each (In a Box of 500)
units
16A SCR TO-220AB 400V 250A Through Hole 30mA 1.5V 40mA 3 10.28mm 4.82mm 9.28mm 10.28 x 4.82 x 9.28mm
RS Stock No. 829-0680
Mfr. Part No.TS1220-600B
€1.34
Each (In a Pack of 10)
units
8A SCR DPAK (TO-252) 700V - Surface Mount 200µA 0.8V 5mA 3 6.73mm 6.22mm 2.4mm 6.73 x 6.22 x 2.4mm
RS Stock No. 877-3043
Mfr. Part No.TN1515-600B-TR
€0.981
Each (In a Pack of 10)
units
9.5A SCR DPAK (TO-252) 600V 165A Surface Mount 15mA 1.3V 40mA 3 6.6mm 6.2mm 2.4mm 6.6 x 6.2 x 2.4mm
RS Stock No. 436-8114
Mfr. Part No.BT152-800R
€1.004
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 10.3 x 4.7 x 9.4mm
RS Stock No. 817-2465
Mfr. Part No.VS-50RIA80
BrandVishay
€17.49
Each
units
80A SCR TO-65 800V 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. 829-0469
Mfr. Part No.TXN625RG
€2.598
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. 878-1772
Mfr. Part No.L6008L6
BrandLittelfuse
€1.175
Each (In a Pack of 500)
units
8A - TO-220 600V 85A Through Hole 5 mA, 10 mA 1.3V 10mA 3 10.67mm 4.78mm 15.75mm 10.67 x 4.78 x 15.75mm
RS Stock No. 395-3496
Mfr. Part No.VS-50RIA40
BrandVishay
€17.61
Each
units
50A SCR TO-65 400V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
RS Stock No. 876-8509
Mfr. Part No.S6008LS3
BrandLittelfuse
€1.22
Each (In a Pack of 10)
units
8A SCR TO-220 600V 100A Through Hole 500µA 0.8V 8mA 3 10.67mm 4.78mm 15.75mm 10.67 x 4.78 x 15.75mm
RS Stock No. 284-882
Mfr. Part No.BT148-600R
€0.49
Each
units
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. 877-2801
Mfr. Part No.P0118MA 2AL3
€0.334
Each (In a Pack of 25)
units
0.5A SCR TO-92 600V 8A Through Hole 5µA 0.8V 5mA 3 4.7mm 3.7mm 4.4mm 4.7 x 3.7 x 4.4mm
RS Stock No. 877-3068
Mfr. Part No.TS820-600B-TR
€0.863
Each (In a Pack of 20)
units
5A SCR DPAK (TO-252) 600V 73A Surface Mount 200µA 0.8V 5mA 3 6.73mm 6.22mm 2.4mm 6.73 x 6.22 x 2.4mm
RS Stock No. 145-8674
Mfr. Part No.TZ500N12KOFHPSA1
BrandInfineon
€141.047
Each (In a Tray of 3)
units
500A PCT BG-PB501-1 1200V 17000A Panel Mount 250mA 2.2V 300mA 5 101mm 50mm 52mm 101 x 50 x 52mm
RS Stock No. 862-4916
Mfr. Part No.2N6405G
BrandLittelfuse
€0.431
Each (In a Pack of 10)
units
10A SCR TO-220AB 800V 160A Through Hole 60mA 2.5V 60mA 3 10.28mm 4.82mm 15.75mm 10.28 x 4.82 x 15.75mm
RS Stock No. 103-5680
Mfr. Part No.BT152-800R
€0.83
Each (In a Tube of 50)
units
13A SCR TO-220AB 800V 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. 877-3046
Mfr. Part No.TN2540-800G-TR
€0.65
Each (In a Pack of 5)
units
16A SCR D2PAK (TO-263) 800V 314A Surface Mount 40mA 1.3V 50mA 3 10.28mm 9.35mm 4.6mm 10.28 x 9.35 x 4.6mm
RS Stock No. 165-6237
Mfr. Part No.VS-50RIA80
BrandVishay
€13.507
Each (In a Bag of 100)
units
80A SCR TO-65 800V 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. 919-4375
Mfr. Part No.VS-30TPS12-M3
BrandVishay
€4.668
Each (In a Tube of 25)
units
20A SCR TO-247AC 1200V 300A Through Hole 45mA 2V 100mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm
RS Stock No. 839-1317
Mfr. Part No.TZ500N12KOFHPSA1
BrandInfineon
€155.16
Each
units
500A PCT BG-PB501-1 1200V 17000A Panel Mount 250mA 2.2V 300mA 5 101mm 50mm 52mm 101 x 50 x 52mm
RS Stock No. 544-9999
Mfr. Part No.2N6507G
BrandLittelfuse
€1.01
Each
units
16A SCR TO-220AB 400V 250A Through Hole 30mA 1.5V 40mA 3 10.28mm 4.82mm 9.28mm 10.28 x 4.82 x 9.28mm
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