Thyristor | SCR | Silicon Controlled Rectifier | RS
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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

    1069 Products showing for Thyristors

    WeEn Semiconductors Co., Ltd
    5A
    SCR
    TO-220F
    500V
    -
    82A
    Through Hole
    -
    0.2mA
    -
    -
    1.5V
    -
    6mA
    3
    10.3 x 4.6 x 9.3mm
    Vishay
    22A
    SCR
    TO-48
    1000V
    -
    420A
    Thread Mount
    -
    60mA
    -
    -
    2V
    -
    130mA
    2
    -
    WeEn Semiconductors Co., Ltd
    16A
    SCR
    TO-220AB
    800V
    -
    330A
    Through Hole
    -
    35mA
    -
    -
    1V
    -
    60mA
    3
    10.3 x 4.7 x 9.4mm
    Vishay
    22A
    SCR
    TO-48
    800V
    -
    420A
    Thread Mount
    -
    60mA
    -
    -
    2V
    -
    130mA
    2
    -
    WeEn Semiconductors Co., Ltd
    2.5A
    SCR
    SOT-82
    600V
    -
    38A
    Through Hole
    -
    0.2mA
    -
    -
    1.5V
    -
    6mA
    3
    7.8 x 2.8 x 11.1mm
    Littelfuse
    2.55A
    SCR
    TO-225
    600V
    -
    20A
    Through Hole
    -
    0.2mA
    -
    -
    0.8V
    -
    3mA
    3
    7.74 x 2.66 x 11.04mm
    Semikron
    106A
    SCR
    SEMIPACK1
    1600V
    -
    2250A
    Panel Mount
    -
    150mA
    -
    -
    3V
    -
    250mA
    7
    93 x 20 x 30mm
    Vishay
    50A
    SCR
    TO-65
    1200V
    -
    1490A
    Thread Mount
    -
    100mA
    -
    -
    2.5V
    -
    200mA
    2
    19.2 x 17.35 x 42.5mm
    United Automation
    -
    -
    -
    -
    50A
    -
    Screw Mount
    36kW
    -
    -
    -
    -
    -
    -
    -
    241 x 152 x 115mm
    WeEn Semiconductors Co., Ltd
    7.5A
    SCR
    TO-220AB
    500V
    -
    132A
    Through Hole
    -
    15mA
    -
    -
    1.5V
    -
    20mA
    3
    10.3 x 4.7 x 9.4mm
    IXYS
    60A
    SCR
    PLUS247
    1600V
    -
    1.51kA
    Through Hole
    -
    200mA
    -
    -
    1.6V
    -
    200mA
    3
    16.13 x 5.21 x 21.34mm
    WeEn Semiconductors Co., Ltd
    7.5A
    SCR
    TO-220AB
    800V
    -
    132A
    Through Hole
    -
    15mA
    -
    -
    1.5V
    -
    20mA
    3
    10.3 x 4.7 x 9.4mm
    WeEn Semiconductors Co., Ltd
    0.5A
    SCR
    SPT
    600V
    -
    9A
    Through Hole
    -
    0.2mA
    -
    -
    0.8V
    -
    5mA
    3
    4.8 x 4.2 x 5.2mm
    WeEn Semiconductors Co., Ltd
    13A
    SCR
    TO-220AB
    650V
    -
    220A
    Through Hole
    -
    32mA
    -
    -
    1.5V
    -
    60mA
    3
    10.3 x 4.7 x 9.4mm
    Vishay
    70A
    SCR
    Super-247
    1200V
    -
    1400A
    Through Hole
    -
    100mA
    -
    -
    1.5V
    -
    200mA
    3
    -
    Vishay
    410A
    PCT
    TO-200AB
    1600V
    -
    5970A
    Screw Mount
    -
    150mA
    -
    -
    3V
    -
    600mA
    3
    42 x 42 x 14.4mm
    United Automation
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    205 x 155 x 120mm
    United Automation
    -
    -
    -
    -
    16A
    -
    Screw Mount
    3.7kW
    -
    -
    -
    -
    -
    -
    -
    58 x 55 x 36mm
    Vishay
    720A
    SCR
    TO-200AB
    1400V
    -
    -
    Panel Mount
    -
    200mA
    -
    -
    3V
    -
    600mA
    3
    42 (Dia.) x 15.1mm
    Vishay
    16A
    SCR
    TO-48
    600V
    -
    360A
    Thread Mount
    -
    60mA
    -
    -
    2V
    -
    130mA
    2
    -
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