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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.

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 IXYS, Dual Thyristor Module 1200 V 2.4 kA, 116 A 150 mA 1.5 V TO-240AA 7-Pin RS stock no. 668-7029 Mfr. Part No. MCC95-12io1B Subtotal (1 unit) R 830,46(exc. VAT) R 830,46/unit Quantity	IXYS	Dual Thyristor Module	-	116A	TO-240AA	-	-	1200V	-	2.4kA	Panel	-	-	-	150mA	-	-	-	-	-	7	2.5V	200mA	-	125°C	30mm	92mm	-	No	-	-
In Stock United Automation A437426, Thyristor Power Controller RS stock no. 175-6261 Mfr. Part No. A437426 Subtotal (1 unit) R 9 469,56(exc. VAT) R 9 469,56/unit Quantity	United Automation	Thyristor Power Controller	-	-	-	-	-	-	-	-	Screw	-	-	-	-	-	-	-	-	-	-	-	-	45°C	45°C	-	-	PR3-E	No	-	-
In Stock United Automation MAT, Thyristor Trigger Module RS stock no. 489-3480 Mfr. Part No. MAT Subtotal (1 unit) R 644,39(exc. VAT) R 644,39/unit Quantity	United Automation	Thyristor Trigger Module	-	-	-	-	-	-	-	-	Panel	-	-	-	-	-	-	-	-	-	-	-	-	-	65°C	-	42mm	MAT	BS 7671	-	-
In Stock Semikron Danfoss SKKH 132/18 E, Diode/Thyristor Module SCR 1800 V, 129 A 150 mA 3.6 kA 1.55 V RS stock no. 905-6153 Mfr. Part No. SKKH 132/18 E Subtotal (1 unit) R 2 287,73(exc. VAT) R 2 287,73/unit Quantity	Semikron Danfoss	Diode/Thyristor Module SCR	-	129A	A-21	SCR	-	1800V	-	3.6kA	Panel	-	-	-	150mA	-	-	-	-	-	7	2V	300mA	-40°C	125°C	-	-	-	No	-	-
In Stock United Automation AFM11, Universal Phase Angle Trigger Module RS stock no. 489-3418 Mfr. Part No. AFM11 Subtotal (1 unit) R 2 157,35(exc. VAT) R 2 157,35/unit Quantity	United Automation	Universal Phase Angle Trigger Module	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0°C	75°C	-	-	AFM11	I.E.T. Regulations (BS7671), Low Voltage Directive (LVD), EMC Directive	-	-
In Stock Semikron Danfoss SKKT 162/12 E, Dual Thyristor Module 1200 V, 156 A 150 mA 5.4 kA 1.6 V RS stock no. 659-680 Mfr. Part No. SKKT 162/12 E Subtotal (1 unit) R 2 111,94(exc. VAT) R 2 111,94/unit Quantity	Semikron Danfoss	Dual Thyristor Module	-	156A	SEMIPACK2	SCR	-	1200V	-	5.4kA	Panel	-	-	-	150mA	-	-	-	-	-	7	2V	400mA	-40°C	125°C	-	-	-	No	-	-
In Stock Semikron Danfoss SKKT 42B12 E, Dual Thyristor Module 1200 V, 40 A 150 mA 1 kA 1.95 V RS stock no. 158-9037 Mfr. Part No. SKKT 42B12 E Subtotal (1 unit) R 915,72(exc. VAT) R 915,72/unit Quantity	Semikron Danfoss	Dual Thyristor Module	-	40A	SEMIPACK1	SCR	-	1200V	-	1kA	Panel	-	-	-	150mA	-	-	-	-	-	7	3V	250mA	-40°C	125°C	-	-	-	No	-	-
In Stock Semikron Danfoss SKKT 162/22 E H4, Dual Thyristor Module 2200 V 5.2 kA, 143 A 150 mA 1.65 V SEMIPACK2 5-Pin RS stock no. 905-6190 Mfr. Part No. SKKT 162/22 E H4 Subtotal (1 unit) R 5 872,52(exc. VAT) R 5 872,52/unit Quantity	Semikron Danfoss	Dual Thyristor Module	-	143A	SEMIPACK2	-	-	2200V	-	5.2kA	Panel	-	-	-	150mA	-	-	-	-	-	5	2V	400mA	-	125°C	30mm	94mm	-	No	-	-
In Stock Semikron Danfoss SKKT 162/16 E, Dual Thyristor Module 1600 V, 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) R 2 352,03(exc. VAT) R 2 352,03/unit Quantity	Semikron Danfoss	Dual Thyristor Module	-	156A	SEMIPACK2	SCR	-	1600V	-	5.4kA	Panel	-	-	-	150mA	-	-	-	-	-	7	2V	400mA	-40°C	125°C	-	-	-	No	-	-
In Stock Semikron Danfoss SKKT 106/16 E, Dual Thyristor Module 1600 V, 106 A 150 mA 2.25 kA 1.65 V RS stock no. 905-6122 Mfr. Part No. SKKT 106/16 E Subtotal (1 unit) R 1 224,66(exc. VAT) R 1 224,66/unit Quantity	Semikron Danfoss	Dual Thyristor Module	-	106A	A-46	SCR	-	1600V	-	2.25kA	Panel	-	-	-	150mA	-	-	-	-	-	7	3V	250mA	-40°C	130°C	-	-	-	No	-	-
Temporarily out of stock Semikron Danfoss SKKH 520/18 E, Diode Module 15000 A, 506 A Module 5-Pin RS stock no. 775-482 Mfr. Part No. SKKH 520/18 E Subtotal (1 unit) R 14 984,84(exc. VAT) R 14 984,84/unit Quantity	Semikron Danfoss	Diode Module	-	506A	Module	-	-	-	-	15000A	Screw	-	-	-	-	-	-	-	-	-	5	-	-	-	130°C	52mm	150mm	SEMIPACK	UL	60mm	-
In Stock Littelfuse S6065KTP, Thyristor 600 V, 65 A 50 mA 950 A 1.8 V RS stock no. 793-1920 Mfr. Part No. S6065KTP Subtotal (1 unit) R 181,93(exc. VAT) R 181,93/unit Quantity	Littelfuse	Thyristor	-	65A	TO-218	SCR	-	600V	-	950A	Through Hole	-	-	-	50mA	-	-	-	-	-	3	2V	80mA	-40°C	125°C	-	-	-	No	-	-
In Stock United Automation FC36M, Three Phase Thyristor Driver 500 mA RS stock no. 232-9347 Mfr. Part No. FC36M Subtotal (1 unit) R 7 318,69(exc. VAT) R 7 318,69/unit Quantity	United Automation	Three Phase Thyristor Driver	-	-	PCB	SCR	-	-	-	-	DIN Rail	-	-	-	500mA	-	-	-	-	-	-	-	-	0°C	65°C	-	-	FC36M	I.E.T. Regulations (BS7671)	-	-
Temporarily out of stock Semikron Danfoss SKT 24/16 E, Thyristor 1600 V, 22 A 100 μA 450 A 1.9 V RS stock no. 905-6046 Mfr. Part No. SKT 24/16 E Subtotal (1 unit) R 558,50(exc. VAT) R 558,50/unit Quantity	Semikron Danfoss	Thyristor	-	22A	B-2	SCR	-	1600V	-	450A	Screw	-	-	-	100μA	-	-	-	-	-	3	3V	150mA	-40°C	130°C	-	-	-	No	-	-
In Stock Littelfuse 2N6509G, Thyristor 800 V, 16 A 30 mA 250 A 1.8 V RS stock no. 545-0006 Mfr. Part No. 2N6509G Subtotal (1 unit) R 40,37(exc. VAT) R 40,37/unit Quantity	Littelfuse	Thyristor	-	16A	TO-220	SCR	-	800V	-	250A	Through Hole	-	-	-	30mA	-	-	-	-	-	3	1.5V	40mA	-40°C	125°C	-	-	2N650x	No	-	-
Temporarily out of stock Semikron Danfoss SKKT 570/16 E, Dual Thyristor Module 1600 V 1.5 kA, 570 A 150 mA 1.65 V 7-Pin RS stock no. 905-6239 Mfr. Part No. SKKT 570/16 E Subtotal (1 unit) R 16 534,43(exc. VAT) R 16 534,43/unit Quantity	Semikron Danfoss	Dual Thyristor Module	-	570A	-	-	-	1600V	-	1.5kA	Panel	-	-	-	150mA	-	-	-	-	-	7	3V	250mA	-	125°C	30mm	93mm	-	No	-	-
Temporarily out of stock Semikron Danfoss SKKH 162/18 E, Diode/Thyristor Module SCR 1800 V 5.4 kA, 156 A 150 mA 1.6 V SEMIPACK2 5-Pin RS stock no. 505-3087 Mfr. Part No. SKKH 162/18 E Subtotal (1 unit) R 2 288,75(exc. VAT) R 2 288,75/unit Quantity	Semikron Danfoss	Diode/Thyristor Module SCR	-	156A	SEMIPACK2	-	-	1800V	-	5.4kA	Panel	-	-	-	150mA	-	-	-	-	-	5	2V	400mA	-	125°C	30mm	94mm	-	No	-	-
In Stock Semikron Danfoss SKKT 132/12 E, Dual Thyristor Module 1200 V, 137 A 150 mA 4.7 kA 1.8 V RS stock no. 659-668 Mfr. Part No. SKKT 132/12 E Subtotal (1 unit) R 2 304,34(exc. VAT) R 2 304,34/unit Quantity	Semikron Danfoss	Dual Thyristor Module	-	137A	SEMIPACK2	SCR	-	1200V	-	4.7kA	Panel	-	-	-	150mA	-	-	-	-	-	7	2V	400mA	-40°C	125°C	-	-	-	No	-	-
In Stock Semikron Danfoss SKT 551/16 E, Thyristor 1600 V, 391 A 250 mA 9 kA 1.65 V RS stock no. 905-6162 Mfr. Part No. SKT 551/16 E Subtotal (1 unit) R 3 241,18(exc. VAT) R 3 241,18/unit Quantity	Semikron Danfoss	Thyristor	-	391A	B-11	SCR	-	1600V	-	9kA	Panel	-	-	-	250mA	-	-	-	-	-	3	3V	500mA	-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) R 2 285,45(exc. VAT) R 2 285,45/unit Quantity	United Automation	Thyristor Power Controller	-	-	-	Triac Power Device	-	-	-	-	Top, Vertical, Bottom	-	-	-	-	-	-	-	-	-	-	-	-	85°C	90°C	-	-	PR1-E	CE marking, RoHS	-	-