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 its 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. 839-1391
Mfr. Part No.T880N16TOFXPSA1
880A PCT BG-T5726K-1 1600V 17500A Stud 250mA 2.2V 300mA 5 - - 26.5mm 58 (Dia.) x 26.5mm
RS Stock No. 135-8211
Mfr. Part No.CLA30E1200HB
Each (In a Tube of 30)
30A SCR TO-247 1200V 325A Through Hole 50mA 1.6V 60mA 3 16.24mm 5.3mm 21.45mm 16.24 x 5.3 x 21.45mm
RS Stock No. 795-9142
Mfr. Part No.X0202MA 1BA2
Each (In a Pack of 25)
1.25A SCR TO-92 600V 25A Through Hole 200µA 0.8V 5mA 3 4.7mm 3.7mm 4.4mm 4.7 x 3.7 x 4.4mm
RS Stock No. 171-9588
Mfr. Part No.S6020LTP
Each (In a Pack of 5)
20A SCR TO-220AB - 300A Through Hole 30mA 1.5V 40mA 3 10.67mm 4.78mm 15.75mm 10.67 x 4.78 x 15.75mm
RS Stock No. 163-7336
Mfr. Part No.TN4015H-6G-TR
Each (On a Reel of 1000)
25A SCR D2PAK 600V 394A Surface Mount 15mA 1.3V 60mA 2 + Tab 10.28mm 9.35mm 4.6mm 10.28 x 9.35 x 4.6mm
RS Stock No. 862-4950
Mfr. Part No.MCR72-6G
Each (In a Pack of 10)
8A SCR TO-220AB 400V 100A Through Hole 200mA 1.5V 6mA 3 10.53mm 4.83mm 15.75mm 10.53 x 4.83 x 15.75mm
RS Stock No. 774-3458
Mfr. Part No.C106BG
Each (In a Pack of 10)
2.55A SCR TO-225AA 200V 20A Through Hole 500µA 1V 6mA 3 7.74mm 2.66mm 11.04mm 7.74 x 2.66 x 11.04mm
RS Stock No. 123-1466
Mfr. Part No.FS5030QP00TU
Each (In a Pack of 5)
50A SCR TO-3P 1200V - Through Hole 80mA - - 3+Tab - - - -
RS Stock No. 877-2801
Mfr. Part No.P0118MA 2AL3
Each (In a Pack of 25)
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. 708-4446
Mfr. Part No.VS-40TPS16-M3
35A SCR TO-247AC 1600V 600A Through Hole 150mA 2.5V 150mA 3 15.87mm 5.31mm 20.7mm 15.87 x 5.31 x 20.7mm