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. 687-1038
Mfr. Part No.TYN812RG
HK$12.87
Each (In a Pack of 2)
units
8A SCR TO-220AB 800V 145A Through Hole 15mA 1.3V 30mA 3 10.4mm 4.6mm 9.15mm 10.4 x 4.6 x 9.15mm
RS Stock No. 103-8143
Mfr. Part No.BT152-600R
HK$6.322
Each (In a Tube of 50)
units
13A SCR TO-220AB 650V 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. 163-7338
Mfr. Part No.TN4015H-6T
HK$9.362
Each (In a Tube of 50)
units
25A SCR TO-220AB 600V 394A Through Hole 15mA 1.3V 60mA 3 10.4mm 4.6mm 15.9mm 10.4 x 4.6 x 15.9mm
RS Stock No. 169-5960
Mfr. Part No.ST330S12P1PBF
BrandVishay
HK$1,037.90
Each (In a Bag of 6)
units
330A SCR TO-118 1200V 9420A Stud 200mA 3V 600mA 3 49mm 42.5mm 74.5mm 49 x 42.5 x 74.5mm
RS Stock No. 145-9518
Mfr. Part No.TZ600N12KOFHPSA1
BrandInfineon
HK$1,455.32
Each (In a Tray of 3)
units
600A PCT BG-PB501-1 1200V 17000A Panel Mount 250mA 2.2V 300mA 5 101mm 50mm 52mm 101 x 50 x 52mm
RS Stock No. 227-9208
Mfr. Part No.VS-ST230C12C0
BrandVishay
HK$543.24
Each
units
410A PCT TO-200AB 1200V 5970A Screw Mount 150mA 3V 600mA 3 42mm 42mm 14.4mm 42 x 42 x 14.4mm
RS Stock No. 792-5650
Mfr. Part No.MCR08BT1G
BrandLittelfuse
HK$3.259
Each (On a Tape of 10)
units
0.8A SCR SOT-223 200V 8A Surface Mount 200µA 0.8V 5mA 3+Tab 6.7mm 3.7mm 1.65mm 6.7 x 3.7 x 1.65mm
RS Stock No. 178-5036
Mfr. Part No.BT148-600R
HK$3.466
Each (In a Tube of 120)
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
New
RS Stock No. 188-8494
Mfr. Part No.TN1215-800G-TR
HK$15.546
Each (In a Pack of 5)
units
12A SCR D2PAK - 145A Surface Mount 15mA - 30mA 3 10.28mm 9.35mm 4.37mm 10.28 x 9.35 x 4.37mm
RS Stock No. 165-9922
Mfr. Part No.S8040R
BrandLittelfuse
HK$18.89
Each (On a Reel of 500)
units
40A SCR TO-220AB 400V 520A Through Hole 40000µA 1.5V 60mA 3 10.67mm 4.78mm 15.75mm 10.67 x 4.78 x 15.75mm
RS Stock No. 862-4957
Mfr. Part No.MCR72-3G
BrandLittelfuse
HK$7.427
Each (In a Pack of 10)
units
8A SCR TO-220AB 100V 100A Through Hole 200mA 1.5V 6mA 3 10.53mm 4.83mm 15.75mm 10.53 x 4.83 x 15.75mm
New
RS Stock No. 188-8547
Mfr. Part No.TS1220-600B-TR
HK$14.702
Each (In a Pack of 5)
units
12A SCR DPAK - 115A Surface Mount 200µA - 5mA 3 6.73mm 6.22mm 2.17mm 6.73 x 6.22 x 2.17mm
RS Stock No. 121-7905
Mfr. Part No.MCR708AT4G
BrandLittelfuse
HK$3.415
Each (On a Reel of 2500)
units
- SCR DPAK (TO-252) 600V 35A Surface Mount 300µA 1V 10mA 3 6.73mm 6.22mm 2.38mm 6.73 x 6.22 x 2.38mm
RS Stock No. 169-5842
Mfr. Part No.ST230C12C0
BrandVishay
HK$336.472
Each (In a Box of 12)
units
410A PCT TO-200AB 1200V 5970A Screw Mount 150mA 3V 600mA 3 42mm 42mm 14.4mm 42 x 42 x 14.4mm
RS Stock No. 395-9214
Mfr. Part No.VS-T90RIA60
BrandVishay
HK$263.33
Each
units
90A SCR D 55 600V 1870A Panel Mount 120mA 2.5V 200mA 3 41mm 27mm 25mm 41 x 27 x 25mm
RS Stock No. 905-6046
Mfr. Part No.SKT 24/16 E
BrandSemikron
HK$182.66
Each
units
22A SCR - 1600V 450A Thread Mount 100 (Min)A 3 (Min)V 150mA 3 - - 41mm 14 (Dia.) x 41mm
RS Stock No. 839-1391
Mfr. Part No.T880N16TOFXPSA1
BrandInfineon
HK$1,186.34
Each
units
880A PCT BG-T5726K-1 1600V 17500A Stud 250mA 2.2V 300mA 5 - - 26.5mm 58 (Dia.) x 26.5mm
RS Stock No. 811-1050
Mfr. Part No.TYN412RG
HK$9.294
Each (In a Pack of 10)
units
12A SCR TO-220 - 145A Through Hole 15mA 1.3V 30mA 3 10.4mm 4.6mm 15.75mm 10.4 x 4.6 x 15.75mm
RS Stock No. 125-8032
Mfr. Part No.CS60-16io1
BrandIXYS
HK$77.25
Each
units
60A SCR PLUS247 1600V 1.51kA Through Hole 200mA 1.6V 200mA 3 16.13mm 5.21mm 21.34mm 16.13 x 5.21 x 21.34mm
RS Stock No. 145-2613
Mfr. Part No.VS-ST700C18L1
BrandVishay
HK$1,185.393
Each (In a Box of 3)
units
910A PCT TO-200AC 1800V 16400A Screw Mount 200mA 3V 600mA 2 58.5mm 58.5mm 27mm 58.5 x 58.5 x 27mm
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