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庫存編號 905-6037
製造零件編號SKT 24/12 E
22A SCR B 2 1200V 450A Thread Mount 100 (Min)mA 3 (Min)V 150mA 3 - - 41mm 14 (Dia.) x 41mm
RS庫存編號 905-6178
製造零件編號SKT 1200/16 E
840A SCR B 14 1600V 30000A Panel Mount 250 (Min)mA 3 (Min)V 500mA 3 - - 26mm 74 (Dia.) x 26mm
RS庫存編號 905-6162
製造零件編號SKT 551/16 E
391A SCR B 11 1600V 9000A Panel Mount 250 (Min)mA 3 (Min)V 500mA 3 - - 14mm 41.5 (Dia.) x 14mm
RS庫存編號 905-6046
製造零件編號SKT 24/16 E
22A SCR - 1600V 450A Thread Mount 100 (Min)A 3 (Min)V 150mA 3 - - 41mm 14 (Dia.) x 41mm
RS庫存編號 905-6074
製造零件編號SKT 16/16 E
18A SCR A 46 1600V 2000A Thread Mount 150 (Min)mA 3 (Min)V 250mA 7 93mm 20mm 30mm 93 x 20 x 30mm
RS庫存編號 2509570224
製造零件編號SKT 491/16 E
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RS庫存編號 2509571097
製造零件編號SKT 553/16 E
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