7MBP75EA120 IGBT Module: Engineering a Compact and Efficient Power Stage
An In-depth Technical Review of the Fuji Electric 1200V, 75A PIM
Content last revised on October 11, 2025.
The Fuji Electric 7MBP75EA120 is a 1200V, 75A Power Integrated Module (PIM) engineered to maximize power density and simplify the design of low-to-medium power motor drives. This module integrates a three-phase converter, a brake chopper, and a three-phase inverter into a single compact package, offering significant advantages in system assembly and thermal management. The core value of the 7MBP75EA120 lies in its ability to provide a complete power conversion stage, reducing both component count and PCB complexity. For applications where space is at a premium and thermal performance is critical, such as compact Variable Frequency Drive (VFD) systems, this integrated approach delivers a robust and efficient solution. This PIM is best suited for motor drive applications up to approximately 30 kW that require a streamlined design process without compromising on reliability.
Key Parameter Overview
Specifications Translated into System-Level Value
The technical specifications of the 7MBP75EA120 are not just numbers; they directly inform the module's performance, reliability, and suitability for specific engineering challenges. Understanding these parameters is key to leveraging the module's full potential in a power system design.
| Parameter | Value | Engineering Implication |
|---|---|---|
| Collector-Emitter Voltage (Vces) | 1200V | Provides a substantial safety margin for applications operating on 400V to 480V AC lines, ensuring robust performance against voltage transients and spikes common in industrial environments. |
| Collector Current (Ic) | 75A | Supports a wide range of low-to-medium power motor applications, typically up to 30 kW, offering sufficient current handling for both continuous and peak load conditions. |
| Collector-Emitter Saturation Voltage (Vce(sat)) | 2.1V (Typ.) / 2.7V (Max.) | A lower Vce(sat) signifies reduced conduction losses, which translates directly to higher inverter efficiency and lower heat generation. This simplifies Thermal Management by potentially allowing for a smaller heatsink. |
| Total Power Dissipation (Pc) | 460W (per IGBT) | Defines the maximum amount of heat the device can dissipate. This value is critical for thermal calculations and ensuring the junction temperature remains within the safe operating area. |
| Integrated NTC Thermistor | Yes | Enables real-time temperature monitoring of the module's baseplate, allowing the control system to implement over-temperature protection and ensure long-term operational reliability. |
| Topology | 7-in-1 CIB | (Converter-Inverter-Brake) Integration of the AC-DC rectifier, DC-AC inverter, and braking circuit into one package dramatically reduces assembly time, simplifies PCB layout, and minimizes system footprint. |
Download the official datasheet for detailed specifications and performance curves.
Application Scenarios & Value
Streamlining Compact VFD and Servo Drive Designs
The primary value of the 7MBP75EA120 is realized in applications demanding high power density and simplified manufacturing. Consider the design of a compact Variable Frequency Drive (VFD) for a conveyor belt system in a logistics warehouse. The engineer's challenge is to fit the entire drive into a constrained enclosure while ensuring reliable operation and managing heat dissipation effectively. The 7-in-1 CIB topology of the 7MBP75EA120 directly addresses this by replacing what would typically be three separate power stages (a diode bridge module, a single IGBT for the brake, and a six-pack IGBT module) with a single component. This integration not only shrinks the required PCB real estate but also reduces the number of high-current connections, minimizing potential points of failure and simplifying the overall assembly process. The built-in NTC thermistor provides a direct feedback loop for temperature monitoring, a critical feature for protecting the Servo Drive from overheating in space-constrained, low-airflow environments.
While this module is optimized for 75A applications, for systems with lower power requirements, the related 7MBR50VP120-50 offers a similar level of integration at a 50A rating.
Frequently Asked Questions
What is the primary advantage of the 7-in-1 CIB topology in the 7MBP75EA120?
The CIB (Converter-Inverter-Brake) configuration significantly streamlines the design and assembly of motor drives. By integrating the input rectifier, output inverter, and braking chopper into a single module, it reduces component count, minimizes PCB space, lowers assembly costs, and improves overall system reliability by reducing the number of interconnects.
How does the integrated NTC thermistor contribute to system reliability?
The built-in NTC thermistor provides a direct, real-time measurement of the module's substrate temperature. This allows the drive's control system to implement precise over-temperature protection (OTP), preventing the IGBT junction temperature from exceeding its maximum rating. This is a critical feature for preventing thermal runaway and extending the operational life of the drive.
What does the 1200V Vces rating signify for a designer working with 480V AC systems?
The 1200V collector-emitter voltage rating provides a crucial safety margin. A 480V AC line can have a rectified DC bus voltage exceeding 670V. The 1200V rating ensures the device can withstand voltage spikes and transients from inductive loads (like motors) and line fluctuations, which is essential for robust and reliable operation in industrial settings.
Is the 7MBP75EA120 suitable for high-frequency switching applications?
This module is designed primarily for motor drive applications, which typically operate at switching frequencies between 2 kHz and 15 kHz. While it offers a good balance between conduction and switching losses, its performance is optimized for this range. For applications requiring significantly higher frequencies, one should carefully analyze the switching loss data (Eon, Eoff) in the datasheet to ensure thermal performance remains within limits.
What are the key considerations for heatsink selection with this PIM?
Heatsink selection depends on the calculated total power losses (conduction and switching) and the module's thermal resistance (Rth). The datasheet provides the junction-to-case thermal resistance. Engineers must use this value, along with the thermal resistance of the thermal interface material (TIM) and the heatsink itself, to ensure the maximum junction temperature is not exceeded under worst-case operating conditions.
An Engineer's Perspective
Beyond the Spec Sheet: Design Philosophy
From a design engineer's viewpoint, a module like the 7MBP75EA120 represents a strategic choice to prioritize integration and design velocity. Opting for a PIM over a discrete solution trades some design flexibility for a significant reduction in complexity and a faster path to market. The critical engineering effort shifts from designing multiple interacting power stages to optimizing the thermal interface and gate drive for a single, well-characterized module. The inclusion of the NTC thermistor is a practical, value-added feature that simplifies the implementation of essential safety protocols, reflecting a design philosophy centered on creating a reliable, all-in-one power core for a specific class of applications.
