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Thyristors

Thyristors are four-layer semiconductor devices, 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. You can learn more in our complete guide to thyristors.

How do thyristors work?

Thyristors usually consist 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 Thyristors are 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 thyristors

Silicon controlled rectifier (SCR) - The basic purpose of an 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 an 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., Firing circuit commander modules are required for this.
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 a four-layer diode but it can conduct in both directions meaning it can contact both AC and DC currents.

Applications of thyristors

Thyristors are commonly found in many everyday applications such as:

Motor speed controls
Pressure control systems
Light dimmers
Liquid level regulators

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In Stock Semikron Danfoss SKKT 57/12 E, Dual Thyristor Module 1.2 kV, 300 A 150 mA 370 A 2.2 V RS Stock No. 905-6093 Mfr. Part No. SKKT 57/12 E Subtotal (1 unit) $161.87(exc. GST) $161.87/unit Quantity	Semikron Danfoss	Dual Thyristor Module	300A	G-12	SCR	1.2kV	370A	Panel	150mA	4	3V	250μA	-40°C	150°C	-	-	-	No	-	-
In Stock United Automation MAT, Thyristor Trigger Module RS Stock No. 489-3480 Mfr. Part No. MAT Subtotal (1 unit) $80.09(exc. GST) $80.09/unit Quantity	United Automation	Thyristor Trigger Module	-	-	-	-	-	Panel	-	-	-	-	-	65°C	-	42mm	MAT	BS 7671	23mm	-
In Stock United Automation ZVS-16DV, Variable AC Voltage Regulator 600 V, 16 A 200 A RS Stock No. 214-3979 Mfr. Part No. ZVS-16DV Subtotal (1 unit) $175.05(exc. GST) $175.05/unit Quantity	United Automation	Variable AC Voltage Regulator	16A	-	-	600V	200A	Surface	-	-	-	-	-20°C	85°C	-	-	ZVS 16DV	BS 7671	-	-
In Stock United Automation TPSR-25, Variable AC Voltage Regulator Modular Power Controller, 25 A 250 A RS Stock No. 841-930 Mfr. Part No. TPSR-25 Subtotal (1 unit) $96.16(exc. GST) $96.16/unit Quantity	United Automation	Variable AC Voltage Regulator Modular Power Controller	25A	-	-	-	250A	-	-	-	-	-	0°C	65°C	-	-	TPSR	I.E.T. Regulations (BS7671)	-	-
In Stock United Automation A14223E, Adjustable Switching Regulator 2.5 kV 250 A, 15 A RS Stock No. 628-628 Mfr. Part No. A14223E Subtotal (1 unit) $139.27(exc. GST) $139.27/unit Quantity	United Automation	Adjustable Switching Regulator	15A	-	-	2.5kV	250A	Panel Mount	-	-	-	-	-	70°C	32mm	55mm	QVR/S - TB	RoHS, CE, REACH, UKCA	59mm	-
In Stock United Automation PAC-2, Phase Angle Power Control Module, 25 A 250 A RS Stock No. 379-6518 Mfr. Part No. PAC-2 Subtotal (1 unit) $132.33(exc. GST) $132.33/unit Quantity	United Automation	Phase Angle Power Control Module	25A	-	-	-	250A	Surface	-	-	-	-	-	65°C	-	-	PAC2	I.E.T. Regulations (BS7671)	-	-
In Stock Semikron Danfoss SKKT 162/16 E, Dual Thyristor Module 1.6 kV, 156 A 150 mA 5.4 kA 1.6 V RS Stock No. 195-4649 Mfr. Part No. SKKT 162/16 E Subtotal (1 unit) $156.79(exc. GST) $156.79/unit Quantity	Semikron Danfoss	Dual Thyristor Module	156A	SEMIPACK2	SCR	1.6kV	5.4kA	Panel	150mA	7	2V	400mA	-40°C	125°C	-	-	-	No	-	-
In Stock Littelfuse S4065JTP, Thyristor 400 V, 65 A 50 mA 950 A 1.8 V RS Stock No. 793-1923 Mfr. Part No. S4065JTP Subtotal (1 unit) $14.67(exc. GST) $14.67/unit Quantity	Littelfuse	Thyristor	65A	TO-218	SCR	400V	950A	Through Hole	50mA	3	2V	80mA	-40°C	125°C	-	-	-	No	-	-
In Stock United Automation A407649, Thyristor Power Controller RS Stock No. 216-3053 Mfr. Part No. A407649 Subtotal (1 unit) $237.16(exc. GST) $237.16/unit Quantity	United Automation	Thyristor Power Controller	-	-	Triac Power Device	-	-	Top, Vertical, Bottom	-	-	-	-	85°C	90°C	-	-	PR1-E	CE marking, RoHS	-	-
In Stock Semikron Danfoss SKKH 106/12 E, Diode/Thyristor Module SCR 1.2 kV, 106 A 150 mA 2.25 kA 1.65 V RS Stock No. 468-2353 Mfr. Part No. SKKH 106/12 E Subtotal (1 unit) $84.55(exc. GST) $84.55/unit Quantity	Semikron Danfoss	Diode/Thyristor Module SCR	106A	SEMIPACK1	SCR	1.2kV	2.25kA	Panel	150mA	5	3V	250mA	-40°C	130°C	-	-	-	No	-	-
In Stock Semikron Danfoss SKKT 132/16 E, Dual Thyristor Module 1.6 kV, 137 A 150 mA 4.7 kA 1.8 V RS Stock No. 262-8391 Mfr. Part No. SKKT 132/16 E Subtotal (1 unit) $156.14(exc. GST) $156.14/unit Quantity	Semikron Danfoss	Dual Thyristor Module	137A	SEMIPACK2	SCR	1.6kV	4.7kA	Panel	150mA	7	2V	400mA	-40°C	125°C	-	-	-	No	-	-
In Stock Semikron Danfoss SKKT 92/16 E, Dual Thyristor Module 1.6 kV, 100 A 150 mA 2.5 kA 1.35 V RS Stock No. 905-6128 Mfr. Part No. SKKT 92/16 E Subtotal (1 unit) $85.63(exc. GST) $85.63/unit Quantity	Semikron Danfoss	Dual Thyristor Module	100A	A-10	SCR	1.6kV	2.5kA	Panel	150mA	3	3V	250mA	-40°C	125°C	-	-	-	No	-	-
In Stock United Automation A13202E, Adjustable Switching Regulator 250 A RS Stock No. 628-624 Mfr. Part No. A13202E Subtotal (1 unit) $128.69(exc. GST) $128.69/unit Quantity	United Automation	Adjustable Switching Regulator	-	-	-	-	250A	-	-	-	-	-	-	-	-	-	-	-	-	-
In Stock United Automation A437425, Thyristor Power Controller, 50 A RS Stock No. 175-6260 Mfr. Part No. A437425 Subtotal (1 unit) $1,070.34(exc. GST) $1,070.34/unit Quantity	United Automation	Thyristor Power Controller	50A	-	SCR	-	-	Surface	-	-	-	-	-	45°C	-	-	PR3-E - SPM	CE	-	-
In Stock IXYS, Thyristor (SCR) 1.2 kV, 70 A 38 mA 970 A 1.87 V RS Stock No. 135-8291 Mfr. Part No. CLA80E1200HF Subtotal (1 unit) $14.99(exc. GST) $14.99/unit Quantity	IXYS	Thyristor (SCR)	70A	PLUS247	SCR	1.2kV	970A	Through Hole	38mA	3	1.5V	100mA	-40°C	125°C	-	-	CLA80	IEC 60747, RoHS, UL 94V-0	-	-
In Stock Semikron Danfoss SKT 551/16 E, Thyristor 1.6 kV, 391 A 250 mA 9 kA 1.65 V RS Stock No. 905-6162 Mfr. Part No. SKT 551/16 E Subtotal (1 unit) $243.00(exc. GST) $243.00/unit Quantity	Semikron Danfoss	Thyristor	391A	B-11	SCR	1.6kV	9kA	Panel	250mA	3	3V	500mA	-40°C	125°C	-	-	-	No	-	-
In Stock Littelfuse 2N6507G, Thyristor 400 V, 16 A 30 mA 250 A 1.8 V RS Stock No. 544-9999 Mfr. Part No. 2N6507G Subtotal (1 unit) $5.64(exc. GST) $5.64/unit Quantity	Littelfuse	Thyristor	16A	TO-220	SCR	400V	250A	Through Hole	30mA	3	1.5V	40mA	-40°C	125°C	-	-	2N650x	No	-	-
In Stock Semikron Danfoss SKKT 42/16 E, Dual Thyristor Module 1.6 kV 1 kA, 40 A 150 mA 1.95 V SEMIPACK1 7-Pin RS Stock No. 905-6099 Mfr. Part No. SKKT 42/16 E Subtotal (1 unit) $64.15(exc. GST) $64.15/unit Quantity	Semikron Danfoss	Dual Thyristor Module	40A	SEMIPACK1	-	1.6kV	1kA	Panel	150mA	7	3V	250mA	-	125°C	30mm	93mm	-	No	20mm	-
In Stock United Automation PSR-25, Phase Angle Power Control Module, 25 A 250 A RS Stock No. 841-924 Mfr. Part No. PSR-25 Subtotal (1 unit) $153.52(exc. GST) $153.52/unit Quantity	United Automation	Phase Angle Power Control Module	25A	-	-	-	250A	Chassis	-	-	-	-	-20°C	65°C	-	-	PSR	I.E.T. Regulations (BS7671), EMC Directive, Low Voltage Directive (LVD)	-	-
Stocked by manufacturer Siemens 3RW5955-0SW06, Thyristor Module, 840 A 690 V RS Stock No. 161-315 Mfr. Part No. 3RW5955-0SW06 Subtotal (1 unit) $5,204.28(exc. GST) $5,204.28/unit Quantity	Siemens	Thyristor Module	840A	-	-	-	-	Screw	-	-	-	-	-	-	-	-	3RW	RoHS, ABS, UKCA, EAC, PRS, DNV, EMV, CE, URS	-	-