Content last revised on May 19, 2026
7MBR75SA120-50 Fuji Electric 1200V 75A 7-Pack IGBT-PIM with Integrated Brake Chopper
The 7MBR75SA120-50 from Fuji Electric is a 1200V / 75A Power Integrated Module (PIM) combining a three-phase inverter bridge with a built-in brake chopper IGBT. Engineered for general-purpose motor drives and servo applications, it consolidates seven IGBT/FWD pairs into a single isolated package. Core specs: VCES 1200V | IC 75A | VCE(sat) typ. 2.5V | Tj(max) 150°C. Key benefits include reduced parasitic inductance and simplified thermal layout. What is the principal design advantage of a 7-in-1 PIM? It eliminates multiple discrete drive loops, cutting inductive overshoot and PCB complexity. For 5.5–11 kW industrial inverters needing brake regeneration, this module is the optimal compact choice.
Key Parameter Overview
Decoding the Specs Behind Long-Term Thermal Stability
| Group | Parameter | Value |
|---|---|---|
| Absolute Maximum (Inverter Part) | Collector-Emitter Voltage (VCES) | 1200 V |
| Continuous Collector Current (IC @ Tc=25°C) | 75 A | |
| Peak Collector Current (ICP, 1 ms) | 150 A | |
| Electrical Characteristics | VCE(sat) typ. (IC=75A, VGE=15V, Tj=25°C) | 2.5 V (max 3.2 V) |
| Gate-Emitter Voltage (VGES) | ±20 V | |
| Thermal & Isolation | Junction Temperature (Tj max) | 150 °C |
| Isolation Voltage (Viso, AC 1 min) | 2500 V AC | |
| Rth(j-c) per IGBT (Inverter) | 0.4 K/W (typ.) | |
| Topology | Configuration | 6-Pack Inverter + Brake Chopper IGBT |
Application Scenarios & Value
Engineering Reliable Compact Inverters for Industrial Motion Control
For 7.5 kW general-purpose Variable Frequency Drives operating from a 400 V AC line, the 7MBR75SA120-50 directly addresses a recurring engineer challenge: managing regenerative energy from inertial loads without external chopper hardware. The integrated seventh IGBT switches a dynamic braking resistor, dumping kinetic energy during deceleration ramps in conveyor and centrifuge applications. This eliminates a separate brake module, freeing roughly 30% of PCB real estate.
Typical target systems include:
- Industrial inverters for pumps, fans, and conveyors (5.5–11 kW class)
- Servo drives with frequent forward-reverse cycling
- Elevator drives requiring controlled deceleration
- Compact UPS systems with regenerative discharge stages
- Welding wire feeders and small CNC spindle drives
The 1200V VCES rating delivers a healthy voltage margin against DC-link transients on 400/480 V lines, especially during long-cable motor switching. For lower current envelopes, the 7MBR25SA120-50 offers the same 7-pack topology at 25 A. Systems requiring the latest trench-gate efficiency may evaluate the 7MBR75U4R120-50, while 7MBR75VR120-50 targets V-series performance upgrades.
Technical Deep Dive
A Closer Look at the Integrated 7-Pack Design and Thermal Path
The defining characteristic of the 7MBR75SA120-50 is its monolithic substrate carrying six inverter IGBTs with anti-parallel FWDs plus a discrete brake IGBT and its dedicated freewheeling diode. All seven chips share a common DBC (Direct Bonded Copper) ceramic isolation layer with 2500 V AC withstand. Think of the package as a thermal "shared apartment": each chip occupies its own room, but all share the same insulated floor — meaning the Rth(c-s) and heatsink design dictate how evenly all seven chips age.
What is the practical effect of the integrated layout? Stray inductance between the brake IGBT and the DC bus is minimized, suppressing turn-off voltage spikes that would otherwise force derating. With VCE(sat) typical 2.5 V, conduction losses at full 75 A produce roughly 188 W per IGBT — well within the thermal envelope when paired with a properly sized aluminum extrusion at ambient ≤40 °C.
Designers should still observe two non-negotiable practices. First, gate resistors must be selected to keep dv/dt below motor insulation limits per IEC 61800-3. Second, the Kelvin-like auxiliary emitter pins should be used for gate drive return paths to avoid common-source feedback during fast switching.
Frequently Asked Questions
Does the integrated brake chopper share the same thermal path as the inverter IGBTs?
Yes. All seven IGBTs sit on a common DBC baseplate. Brake duty cycle must be included in total power dissipation calculations to avoid driving the inverter chips toward Tj limits during sustained regeneration.
How does the 2.5 V typical VCE(sat) impact heatsink sizing for a 7.5 kW inverter?
At 75 A continuous, expect roughly 190 W of conduction loss per IGBT plus switching losses. A heatsink achieving Rth(s-a) ≤ 0.25 K/W typically maintains Tj below 125 °C at 40 °C ambient with 8 kHz PWM.
What is the practical benefit of the 1200V VCES rating in a 400V AC drive?
It provides a 2.5× safety margin over the 540 V nominal DC bus, accommodating regenerative bus pumping, long-cable reflected waves, and brief grid surges without breakdown stress.
Need stock verification, lead time, or full electrical curves for your design? Request a quote from our sales team for sourcing options on the 7MBR75SA120-50.
