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What is a thyristor module

Silicon-controlled rectifier modules are commonly referred to as power semiconductor modules. They were first introduced to the field of power electronics by Siemens in 1970. These modules use a packaged form and consist of high-power semiconductor devices with a four-layer structure containing three PN junctions.



Silicon-controlled rectifier modules can be classified into two major categories based on their internal packaging chips: controllable modules and rectifier modules. Furthermore, when considering their specific applications, they can be categorized as follows:

  • Standard thyristor modules (MTC \ MTX \ MTK \ MTA)
  • Standard diode module (MDC)
  • Standard thyristors and diodes mixed module (MFC)
  • Fast thyristors and diodes mixed module (MKC\MZC)
  • Non-insulated thyristors and diodes mixed module (commonly known as welding machine-specific modules MTG \ MDG)
  • Three-phase rectifier bridge output SCR modules (MDS)
  • Single-phase rectifier bridge modules (MDQ)
  • Single-phase half-controlled bridge (three-phase full-controlled bridge) modules (MTS)
  • And Schottky diode modules
  • Among others


Its small size, light weight, compact structure, high reliability, simple external connections, good interchangeability, ease of maintenance and installation, excellent structural repeatability, simplified mechanical design, and lower cost compared to discrete components have made it highly favored by major power semiconductor manufacturers from its inception, leading to its significant growth.

Internal structure of a diodes module MDK Serie

Specifications and models

Power module model names typically follow a specific naming convention to convey important information about the module’s specifications. While there can be variations, a common naming convention for power modules might include the following components:

  1. Module Type: This part of the name specifies the type of power module, such as Diode, Thyristor, or Schottky.

  2. Voltage Rating: It includes information about the module’s voltage handling capability. For example, a module might be named “1600V” to indicate it can handle voltages up to 1600 volts.

  3. Current Rating: This part specifies the maximum current the module can handle. It might be labeled as “200A,” indicating a maximum current of200 amperes.

  4. Package Type: The package type or form factor of the module, such as “301F” “601F” “104B” or other package designs.

  5. Manufacturer or Series: Sometimes, the manufacturer’s name or a series identifier is included in the model name, which can be useful for identifying the source or family of the module.

  6. Additional Features: Some modules might include additional features, which are often indicated in the name. For instance, “fast-switching” or “low-loss” might be mentioned.

  7. Optional Suffixes: Depending on the manufacturer and specific product, there could be optional suffixes or codes to further detail variations or specific characteristics of the module.

Here’s an example of a power module model name: “LJ-MDK200A1600V 301F

In this example, the model name indicates that it’s a diode power module with a voltage rating of 1600 volts and a current rating of 200 amperes, using a 301F package, manufactured by “LJ-MD” and featuring double diodes.

MDK200A1600V characteristics
MDK200A1600V characteristics

To learn more about the Parameter Symbols

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