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. 509-566
Mfr. Part No.BT151-500R,127
HK$3.632
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 10.3 x 4.7 x 9.4mm
RS Stock No. 168-9404
Mfr. Part No.BT151-500R,127
HK$3.785
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 10.3 x 4.7 x 9.4mm
RS Stock No. 395-3468
Mfr. Part No.VS-50RIA100
BrandVishay
HK$146.32
Each
units
50A SCR TO-65 1000V 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. 395-2831
Mfr. Part No.VS-22RIA40
BrandVishay
HK$99.92
Each
units
22A SCR TO-48 400V 420A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 862-4929
Mfr. Part No.2N6508G
BrandLittelfuse
HK$14.793
Each (In a Pack of 10)
units
16A SCR TO-220AB 600V 250A Through Hole 75mA 1.5V 80mA 3 10.28mm 4.82mm 15.75mm 10.28 x 4.82 x 15.75mm
RS Stock No. 169-5899
Mfr. Part No.22RIA40
BrandVishay
HK$46.919
Each (In a Bag of 100)
units
22A SCR TO-48 400V 420A Thread Mount 60mA 2V 130mA 2 16.51mm - 41.8mm -
RS Stock No. 177-5212
Mfr. Part No.2N6508G
BrandLittelfuse
HK$10.116
Each (In a Box of 500)
units
16A SCR TO-220AB 600V 250A Through Hole 75mA 1.5V 80mA 3 10.28mm 4.82mm 15.75mm 10.28 x 4.82 x 15.75mm
RS Stock No. 544-9999
Mfr. Part No.2N6507G
BrandLittelfuse
HK$17.02
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
RS Stock No. 103-2939
Mfr. Part No.2N6507G
BrandLittelfuse
HK$10.298
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. 121-6890
Mfr. Part No.CR25RM-12D#B00
HK$40.875
Each (In a Pack of 2)
units
25A SCR TO-3PFM 600V 360A Through Hole 30mA 1.5V 15mA 3 15.6mm 5.5mm 19.9mm 15.6 x 5.5 x 19.9mm
RS Stock No. 194-372
Mfr. Part No.CS23-12IO2
BrandIXYS
HK$230.66
Each
units
32A SCR TO-208AA 1200V 480A Thread Mount 50mA 2.5V 100mA 3 15.7mm 14mm 39.5mm 15.7 x 14 x 39.5mm
RS Stock No. 878-1653
Mfr. Part No.Q4016LH6
BrandLittelfuse
HK$9.842
Each (In a Pack of 500)
units
16A TRIAC TO-220 400V 200A Through Hole 80mA 1.3V 70mA 3 10.67mm 4.78mm 15.75mm 10.67 x 4.78 x 15.75mm
RS Stock No. 920-0751
Mfr. Part No.CS23-12IO2
BrandIXYS
HK$196.451
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 15.7 x 14 x 39.5mm
RS Stock No. 357-3438
Mfr. Part No.VS-ST083S08PFM1P
BrandVishay
HK$735.04
Each
units
85A SCR TO-94 800V 2560A Thread Mount 200mA 3V 600mA 3 - - 191mm 29.5 (Dia.) x 191mm
RS Stock No. 165-2437
Mfr. Part No.VS-ST083S08PFM1P
BrandVishay
HK$788.56
Each (In a Bag of 25)
units
85A SCR TO-94 800V 2560A Thread Mount 200mA 3V 600mA 3 - - 191mm 29.5 (Dia.) x 191mm
RS Stock No. 165-2391
Mfr. Part No.VS-50RIA120
BrandVishay
HK$70.549
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 19.2 x 17.35 x 42.5mm
RS Stock No. 920-0795
Mfr. Part No.CS30-16IO1
BrandIXYS
HK$35.353
Each (In a Tube of 30)
units
31A SCR TO-247AD 1600V 320A Through Hole 65mA 1V 100mA 3 16.26mm - 21.46mm -
RS Stock No. 920-0798
Mfr. Part No.CS35-12IO4
BrandIXYS
HK$277.102
Each (In a Tube of 10)
units
69A SCR TO-208AC 1200V 1340A Thread Mount 100mA 1.5V 80mA 2 19.62mm 17mm 41.3mm 19.62 x 17 x 41.3mm
RS Stock No. 169-5881
Mfr. Part No.30TPS08PBF
BrandVishay
HK$14.923
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 169-5838
Mfr. Part No.50RIA60
BrandVishay
HK$74.031
Each (In a Bag of 100)
units
50A SCR TO-65 600V 1490A Thread Mount 100mA 2.5V 200mA 2 19.2mm 17.35mm 42.5mm 19.2 x 17.35 x 42.5mm
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