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. 793-1923
Mfr. Part No.S4065JTP
BrandLittelfuse
$11.81
Each
units
65A SCR TO-218X 400V 950A Through Hole 50mA 2V 80mA 3 16 x 4.78 x 21.21mm - +125 °C -40 °C
RS Stock No. 178-7030
Mfr. Part No.S4065JTP
BrandLittelfuse
$6.55
Each (In a Tube of 250)
units
65A SCR TO-218X 400V 950A Through Hole 50mA 2V 80mA 3 16 x 4.78 x 21.21mm - +125 °C -40 °C
RS Stock No. 168-9404
Mfr. Part No.BT151-500R,127
$0.599
Each (In a Tube of 50)
units
7.5A SCR TO-220AB 500V 132A Through Hole 15mA 1.5V 20mA 3 10.3 x 4.7 x 9.4mm - +125 °C -40 °C
RS Stock No. 509-566
Mfr. Part No.BT151-500R,127
$0.746
Each (In a Pack of 10)
units
7.5A SCR TO-220AB 500V 132A Through Hole 15mA 1.5V 20mA 3 10.3 x 4.7 x 9.4mm - +125 °C -40 °C
RS Stock No. 395-9258
Mfr. Part No.VS-ST180S12P1VPBF
BrandVishay
$113.29
Each
units
200A SCR TO-93 1200V 5230A Thread Mount 150mA 3V 600mA 3 35 x 30.33 x 49.5mm - +125 °C -40 °C
RS Stock No. 165-2440
Mfr. Part No.VS-ST180S12P1VPBF
BrandVishay
$104.236
Each (In a Bag of 12)
units
200A SCR TO-93 1200V 5230A Thread Mount 150mA 3V 600mA 3 35 x 30.33 x 49.5mm - +125 °C -40 °C
RS Stock No. 395-3474
Mfr. Part No.VS-50RIA120
BrandVishay
$35.27
Each
units
50A SCR TO-65 1200V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2 x 17.35 x 42.5mm - +125 °C -40 °C
RS Stock No. 165-2391
Mfr. Part No.VS-50RIA120
BrandVishay
$24.526
Each (In a Bag of 100)
units
50A SCR TO-65 1200V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2 x 17.35 x 42.5mm - +125 °C -40 °C
RS Stock No. 254-0544
Mfr. Part No.VS-25RIA120
BrandVishay
$34.03
Each
units
25A SCR TO-48 1200V 440A Thread Mount 60mA 2V 130mA 2 - - +125 °C -65 °C
RS Stock No. 145-1945
Mfr. Part No.VS-25RIA120
BrandVishay
$19.661
Each (In a Bag of 100)
units
25A SCR TO-48 1200V 440A Thread Mount 60mA 2V 130mA 2 - - +125 °C -65 °C
RS Stock No. 484-2864
Mfr. Part No.BT151-800R,127
$1.168
Each (In a Pack of 5)
units
7.5A SCR TO-220AB 800V 132A Through Hole 15mA 1.5V 20mA 3 10.3 x 4.7 x 9.4mm - +125 °C -40 °C
RS Stock No. 625-4988
Mfr. Part No.C106D1G
BrandLittelfuse
$0.96
Each
units
2.55A SCR TO-225 400V 20A Through Hole 0.2mA 0.8V 3mA 3 7.74 x 2.66 x 11.04mm - +110 °C -40 °C
RS Stock No. 817-2428
Mfr. Part No.VS-2N5206
BrandVishay
$34.19
Each
units
22A SCR TO-208AA 1000V 340A Thread Mount 80mA 3V 200mA 2 15.5 x 14.3 x 41.7mm 15.5mm +125 °C -40 °C
RS Stock No. 168-7901
Mfr. Part No.TYN412RG
$1.462
Each (In a Tube of 50)
units
12A SCR TO-220 - 145A Through Hole 15mA 1.3V 30mA 3 10.4 x 4.6 x 15.75mm - +125 °C -40 °C
RS Stock No. 165-6021
Mfr. Part No.VS-2N5206
BrandVishay
$21.88
Each (In a Bag of 100)
units
22A SCR TO-208AA 1000V 340A Thread Mount 80mA 3V 200mA 2 15.5 x 14.3 x 41.7mm 15.5mm +125 °C -40 °C
RS Stock No. 177-5179
Mfr. Part No.2N6509TG
BrandLittelfuse
$1.974
Each (In a Tube of 50)
units
- SCR TO-220 800V 250A Through Hole 75mA 1.5V 80mA 3 10.28 x 4.82 x 15.75mm - +125 °C -40 °C
RS Stock No. 545-0006
Mfr. Part No.2N6509G
BrandLittelfuse
$2.39
Each
units
16A SCR TO-220AB 800V 250A Through Hole 30mA 1.5V 40mA 3 10.28 x 4.82 x 9.28mm - +125 °C -40 °C
RS Stock No. 811-1050
Mfr. Part No.TYN412RG
$2.111
Each (In a Pack of 10)
units
12A SCR TO-220 - 145A Through Hole 15mA 1.3V 30mA 3 10.4 x 4.6 x 15.75mm - +125 °C -40 °C
RS Stock No. 800-9200
Mfr. Part No.2N6509TG
BrandLittelfuse
$2.214
Each (In a Pack of 10)
units
- SCR TO-220 800V 250A Through Hole 75mA 1.5V 80mA 3 10.28 x 4.82 x 15.75mm - +125 °C -40 °C
RS Stock No. 103-2940
Mfr. Part No.2N6509G
BrandLittelfuse
$2.139
Each (In a Box of 500)
units
16A SCR TO-220AB 800V 250A Through Hole 30mA 1.5V 40mA 3 10.28 x 4.82 x 9.28mm - +125 °C -40 °C
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