BSM35GD120DN2 IGBT Module: Complete Guide and Technical Breakdown

The BSM35GD120DN2 is a 1200V, 50A IGBT power module originally developed by Eupec and now produced under Infineon Technologies. Known for its solid performance in medium-power systems, this module is widely used in motor drives, inverters, and industrial power setups. It offers strong thermal control, integrated fast diodes, and a compact package, making it reliable for equipment that needs stable and efficient power switching.

• Package Type: Standard IGBT module package

BSM35GD120DN2 Circuit Diagram

The circuit diagram shows the internal layout of the BSM35GD120DN2, a 3-phase IGBT module. It consists of six IGBTs with freewheeling diodes connected in a typical inverter bridge configuration. Each phase leg contains a high-side and a low-side IGBT, forming three half-bridges in total.

Pins 1–4, 5–8, and 9–12 are the gate and emitter control pins for each IGBT. For example, pins 1 and 2 control one IGBT, and pins 3 and 4 control its complementary pair in the same phase leg. Pins 13 and 17 are the main DC positive and DC negative terminals, while pins 15 and 16, and others connected to them, serve as the output terminals for each phase.

BSM35GD120DN2 Package Outline

The packaging diagram of the BSM35GD120DN2 shows its physical layout and detailed mechanical dimensions. The module has a rectangular shape with a total length of 107.5 mm and a width of 45 mm. The mounting hole spacing is 93 mm horizontally and 28.4 mm vertically, allowing secure attachment to a heat sink or panel.

The terminal pins are clearly spaced for easy identification and connection, with labeled gate and emitter pins arranged in a row. The height from the baseplate to the top of the pins reaches up to 17.15 mm. It also includes a zoomed-in view showing the notch detail with a 1.15 mm slot for alignment or mounting.

BSM35GD120DN2 Applications
Industrial Motor Drives
Ideal for controlling AC motors in manufacturing and automation systems, offering precise speed and torque management.

Power Inverters
Used in DC-to-AC conversion systems, including those in renewable energy setups like solar and wind power, to efficiently manage power flow.

Uninterruptible Power Supplies (UPS)
Ensures continuous power delivery during outages, maintaining the operation of critical systems.

Welding Equipment
Provides the necessary power control for various welding processes, ensuring stability and efficiency.

HVAC Systems
Manages the operation of heating, ventilation, and air conditioning units, contributing to energy-efficient climate control.

BSM35GD120DN2 Pros and Cons
Pros
High Voltage and Current Ratings: Supports up to 1200V collector-emitter voltage and 50A continuous collector current, making it suitable for medium to high-power applications.

Integrated Fast Free-Wheel Diodes: Enhances efficiency in inductive load switching by reducing voltage spikes.

Efficient Thermal Management: Features a low thermal resistance (RthJC ≤ 0.44 K/W) and an insulated metal baseplate, facilitating effective heat dissipation.

Compact ECONOPACK™ 2 Package: Offers a space-saving design with simplified mounting and electrical connections.

Robust Environmental Tolerance: Operates reliably across a wide temperature range (-40°C to +125°C) and meets IEC 68-1 standards for climatic endurance.

Cons
Obsolete Status: This module has been discontinued, potentially leading to challenges in sourcing and long-term support.

Limited Switching Speed: With a turn-off delay time of up to 600 ns, it may not be ideal for applications requiring ultra-fast switching.

Moderate Saturation Voltage: A typical VCE(sat) of 2.7V at 25°C could result in higher conduction losses compared to newer IGBT technologies.

Weight Consideration: Weighing approximately 180 grams, it may be heavier than some modern alternatives, which could be a factor in weight-sensitive designs.

Manufacturer
Eupec was a prominent German manufacturer specializing in high-power semiconductor solutions, including IGBT modules, thyristors, and diodes. Eupec's commitment to innovation and quality made it a trusted name in the power electronics industry. In the early 2000s, Eupec became part of Infineon Technologies AG, a leading global semiconductor company. This acquisition allowed Infineon to expand its portfolio of power semiconductor products, integrating Eupec's advanced technologies into its offerings. As a result, many of Eupec's products continued under the Infineon brand, ensuring ongoing support and development for existing customers.

Conclusion
The BSM35GD120DN2 remains a trusted solution for many medium-power applications, despite being discontinued. Its combination of strong electrical ratings, built-in protection, and user-friendly design makes it a go-to module for legacy systems. If you're managing repairs, upgrades, or bulk sourcing, securing this module can help maintain performance and reliability in your systems.