MMG400KR120U
1200 V / 400 A MacMic single-switch IGBT module for high-current inverters, welding power and traction auxiliaries.
The MMG400KR120U is a 1200 V / 400 A MacMic IGBT module in the GK single-switch package, built for high-current power conversion such as welding, traction auxiliaries and large inverters. Its typical saturation voltage of 1.8 V, 1925 W total dissipation and 0.065 K/W junction-to-case thermal resistance deliver high current density from a single module, avoiding the complexity of paralleling smaller devices. The single-switch configuration simplifies busbar design and lets you pair the module with an external diode sized for your exact recovery requirement. Trench Field-Stop technology keeps switching and conduction losses balanced across the load range, and the rugged package tolerates the short-circuit transients common in industrial equipment. Every module is factory-traceable and ships with import declaration, certificate of origin and RoHS documentation. Because it is a high-current part, confirm busbar inductance, gate drive strength and thermal design with our FAE team before layout sign-off. BeiLuo reserves supply against forecast volumes and ships every module with import, origin and RoHS documents, with lead time confirmed before you commit.
FAE Professional Review
The MMG400KR120U is the module we recommend when a design needs 300-400 A from a single switch. The 0.065 K/W thermal path is excellent, but the high current means busbar and gate-loop inductance must be controlled carefully.
| Parameter | Value |
|---|---|
| VCES (V) | 1200 V |
| IC (A) | 400 A |
| VCE(sat) (V) | 1.8 V |
| Configuration | Single switch (GK) |
| Package | GK-U |
Application Circuits
Large inverters
Reference circuits and application schematics for Large inverters are available from our FAE team.
Welding power
Reference circuits and application schematics for Welding power are available from our FAE team.
Traction auxiliaries
Reference circuits and application schematics for Traction auxiliaries are available from our FAE team.
Need a reference schematic or design review? Our FAE engineers can share verified circuits and layout guidance for this part.
Related Documents
Alternative Part Numbers
| Model | Package | Note | Action |
|---|---|---|---|
| MMG100J120UZ | GJ-UZ | Lower-current half-bridge module in the same voltage class | View |
Complementary Part Numbers
| Model | Package | Note | Action |
|---|---|---|---|
| MMF200S120DK | Non-isolated | Matching freewheeling diode | View |
| MM40G3U65BN | TO-247 | Discrete IGBT for auxiliary stages | View |
Recommended Complementary Products
Frequently Asked Questions
When should I choose the 400 A single-switch module?
Choose it when one switch must carry 300-400 A, avoiding parallel devices and their current-sharing risk. It suits large inverters, welding power and traction auxiliaries.
For lower current, a half-bridge module reduces external parts.
What busbar and gate design do I need?
High current demands low-inductance busbars and a stiff, low-inductance gate loop. Keep the commutation loop tight and measure turn-off overvoltage at the module terminals.
Our FAE team can review your layout.
How do I plan the thermal design at 400 A?
Start from the 0.065 K/W RthJC, add interface and heatsink resistance, and verify junction temperature at maximum current. Liquid or high-performance air cooling is typical at this level.
Request a thermal review before committing the heatsink.
Is lead time longer for high-current modules?
High-current modules can be allocation-managed, so confirm annual volume early. BeiLuo sources through MacMic's authorized channel and reserves supply against your plan.
Share your forecast for current lead time.