Content last revised on March 26, 2026
BSM35GD120DN2 Infineon 1200V 35A IGBT Module
The BSM35GD120DN2, a cornerstone of the Infineon (formerly Eupec) EconoPACK 2 family, represents a highly optimized 1200V six-pack configuration designed for mid-range industrial power conversion. By integrating a complete three-phase bridge into a single, thermally efficient module, it serves as a high-reliability solution for Variable Frequency Drive (VFD) and Servo Drive applications where power density is a critical design constraint.
Top Specifications: 1200V | 35A (Tc=80°C) | Vce(sat) 2.5V
Key Engineering Benefits:
- Minimizes inductive loops via an integrated 6-pack layout.
- Enhances system thermal headroom with low Rth(j-c) performance.
One of the primary concerns for engineers evaluating this module is its behavior under fault conditions. The BSM35GD120DN2 effectively addresses this through its Non-Punch Through (NPT) technology, which ensures a Short-Circuit Withstand Time of 10 microseconds, allowing the Gate Drive protection circuitry sufficient time to react and prevent catastrophic failure.
Application Scenarios & Value
Optimizing Thermal Margins in Compact Industrial Inverters
Engineers often face the challenge of maintaining high switching frequencies without exceeding the module's thermal limits within tightly sealed industrial enclosures. The BSM35GD120DN2 provides a definitive answer to this by utilizing NPT-IGBT chips that offer a positive temperature coefficient for Vce(sat). This characteristic is vital for IGBT Paralleling and ensures that current is naturally balanced across the three-phase inverter stages, preventing localized hotspots that can degrade reliability over time.
In a high-fidelity engineering scenario, such as an industrial conveyor system, the startup phase often involves significant inrush currents. The BSM35GD120DN2 handles these surges through its robust SOA (Safe Operating Area), specifically designed to withstand peak loads without de-laminating the internal bond wires. For systems requiring even higher current handling within the same voltage class, the related BSM50GD120DN2 offers an increased current rating of 50A, providing a seamless upgrade path for scaled-up motor control platforms.
By integrating this module into Solar Inverter topologies or UPS (Uninterruptible Power Supply) systems, designers can capitalize on the standardized EconoPACK 2 footprint to simplify mechanical mounting. This integration directly reduces the Total Cost of Ownership (TCO) by lowering assembly labor and reducing the complexity of the internal busbar architecture. Further insights into optimizing these power stages can be found in our guide on Mastering 1200V IGBTs in Industrial Inverters.
Technical Deep Dive
A Closer Look at NPT Technology and Switching Ruggedness
The BSM35GD120DN2 leverages Non-Punch Through (NPT) technology, which differs significantly from older Punch-Through (PT) architectures. To understand the engineering value, consider an analogy: if a PT IGBT is like a highly tuned racing engine that requires precise fuel control to avoid stalling, the NPT-IGBT is like a high-torque industrial motor—it is inherently more rugged and forgiving. The NPT structure provides a wider, more stable RBSOA (Reverse Bias Safe Operating Area), meaning the module can safely turn off high currents even under the stray inductance of a less-than-perfect PCB layout.
Furthermore, the Vce(sat)—the "on-state" voltage drop—acts like a narrow pipe in a water system. A lower Vce(sat) of 2.5V (typical) means less energy is lost as heat during the conduction phase. This is particularly important for PWM frequencies between 4kHz and 16kHz, where balancing conduction losses and Switching Loss is the key to achieving 98%+ inverter efficiency. The module's internal CAL Diode (Controlled Axial Lifetime) complements the IGBT chips by offering soft-recovery characteristics, which significantly mitigates EMI noise and voltage overshoots during high-speed switching transitions.
Key Parameter Overview
Decoding the Specs for Enhanced System Reliability
The following technical data is derived from official documentation and serves as the baseline for system design and Thermal Management calculations.
| Parameter | Symbol | Value (Max/Typ) |
|---|---|---|
| Collector-Emitter Voltage | Vces | 1200 V |
| DC Collector Current (Tc=80°C) | Ic | 35 A |
| Collector-Emitter Saturation Voltage | Vce(sat) | 2.5 V |
| Total Power Dissipation (Per IGBT) | Ptot | 230 W |
| Maximum Operating Temperature | Tvj | 150 °C |
| Short Circuit Withstand Time | t_sc | 10 µs |
Download the BSM35GD120DN2 datasheet for detailed specifications and performance curves.
Technical FAQ
How does the positive temperature coefficient of Vce(sat) benefit parallel operation?
Because Vce(sat) increases as temperature rises, the BSM35GD120DN2 naturally forces a current share. If one IGBT gets hotter, its resistance increases, pushing current to cooler chips, preventing thermal runaway in parallel-drive configurations.
What is the primary advantage of the EconoPACK 2 package for the BSM35GD120DN2?
The EconoPACK 2 housing provides a standardized, low-profile footprint with high power density, allowing for a more compact Welding Power Supply or Variable Frequency Drive design while ensuring superior Thermal Resistance from junction to case.
Does this module require a specific Gate Drive voltage?
For optimal performance and to minimize Switching Loss, a gate voltage of +15V for turn-on and -5V to -15V for turn-off is recommended to prevent parasitic turn-on caused by Miller capacitance during high dv/dt events.
How should the Short-Circuit Withstand Time of 10µs be used in design?
This 10µs rating defines the window in which your desaturation detection or overcurrent protection circuit must shutdown the Gate Drive to protect the BSM35GD120DN2 from failure during a direct output short.
From a strategic perspective, selecting the BSM35GD120DN2 ensures long-term system stability by leveraging Infineon’s proven NPT platform. As industries move toward higher automation, the balance of switching efficiency and ruggedness provided by this module remains a benchmark for reliable industrial power conversion. For a deeper understanding of selecting the right technology for your next project, explore our analysis on IGBT vs MOSFET vs BJT selection.
