TM400HA-2H Mitsubishi 1600V 400A High-Power Thyristor Module

Content last revised on March 16, 2026

Mitsubishi TM400HA-2H 1600V 400A High-Power Thyristor Module

Introduction & Performance Highlights

Optimizing Phase-Control Reliability in Heavy-Duty Rectification

The Mitsubishi TM400HA-2H is a high-capacity phase-control thyristor module designed to facilitate robust power conversion in demanding industrial environments. Utilizing a single-element configuration within a standard industrial block, this module provides an Average On-state Current (IT(AV)) of 400A and a Repetitive Peak Off-state Voltage (VDRM) of 1600V. Engineered for efficiency and long-term thermal stability, it serves as a critical component in AC power regulation and large-scale rectification systems. Key benefits include high surge current capability and an electrically isolated base plate for simplified system integration. What is the primary benefit of its isolated base design? It significantly reduces assembly complexity by allowing direct mounting to common heatsinks without additional insulation layers. For heavy industrial AC-to-DC conversion requiring 1600V isolation and 400A capacity, the TM400HA-2H is the reliable engineering choice.

Application Scenarios & Value

Achieving System-Level Benefits in High-Power Industrial Regulation

Engineers often face significant technical hurdles when managing the high inrush currents typical of large industrial loads, such as massive DC motor drives or resistive heating elements. The TM400HA-2H addresses these challenges through its superior Surge On-state Current (ITSM) rating, which allows the module to withstand transient overloads without catastrophic failure. For systems operating on 480V or 600V AC lines, the 1600V repetitive peak voltage provides a substantial safety margin against line transients and switching spikes, ensuring the longevity of the power stage.

• DC Motor Speed Control: In heavy industrial conveyor systems, the TM400HA-2H is frequently utilized in half-bridge or full-bridge controlled rectifiers to provide precise voltage regulation.
• AC Power Controllers: It is highly effective for phase-angle control in industrial furnaces and high-frequency induction heating, where current throughput and thermal dissipation are paramount.
• Uninterruptible Power Supplies (UPS): Within high-power UPS battery chargers, this module manages the primary rectification stage, converting utility AC to stable DC for battery storage.

For systems that require lower current handling in a similar voltage class, the RM50TC-2H or the QM300HA-2H may be considered based on the specific power density requirements of the enclosure. Leveraging these modules correctly involves a deep understanding of thermal pathways and transient suppression strategies to avoid common power module failure modes.

Technical & Design Deep Dive

Decoding the Thermal Architecture and Phase Control Precision

The internal structure of the TM400HA-2H focuses on minimizing thermal impedance while maintaining high dielectric strength. The use of a high-purity copper baseplate coupled with specialized ceramic insulation allows for a low Thermal Resistance, Junction to Case (Rth(j-c)), which is vital when operating at the maximum rated current of 400A. Lowering the junction temperature directly correlates to a longer MTBF (Mean Time Between Failures) in continuous operation cycles.

From a gate-drive perspective, the TM400HA-2H requires a well-defined trigger pulse to ensure clean turn-on and avoid localized hot spots on the silicon die. Utilizing a high-di/dt gate drive circuit is recommended to prevent excessive switching losses, especially in high-current phase control applications. Understanding these nuances is a key part of decoding power semiconductor datasheets for optimal circuit design. Think of the ITSM (Surge Current) rating as the module’s "structural resilience"—similar to how a bridge is rated for wind loads far beyond its everyday traffic, the thyristor’s surge rating ensures it survives the electrical "gusts" inherent in industrial motor starts.

Key Parameter Overview

Functional Grouping of Specifications for Engineering Assessment

Download the TM400HA-2H datasheet for detailed specifications and performance curves.

Frequently Asked Questions

Engineering Insights for High-Power System Design

• How does the high ITSM rating of 8000A impact fuse selection for the TM400HA-2H?
  The 8000A surge rating determines the I²t (ampere-squared-seconds) value, which is essential for selecting a fast-acting semiconductor fuse. The fuse must have a clearing I²t value lower than the thyristor's withstand limit to prevent module failure during a short-circuit event.
• Why is the 1600V VDRM rating significant for 480V AC industrial applications?
  Standard 480V lines often experience voltage swells or spikes that can exceed 1000V. A 1600V rating provides a safety overhead of over 3x the nominal peak voltage, ensuring the device does not suffer desaturation or breakdown during line disturbances.
• What are the cooling requirements for operating at the full 400A capacity?
  Due to the on-state voltage drop, the module dissipates significant power as heat. A high-efficiency forced-air or liquid-cooled heatsink is required to keep the junction temperature below the 125°C limit, especially under continuous duty.
• Does the TM400HA-2H support high-frequency switching?
  No, thyristors are naturally commutated devices primarily used for 50/60Hz phase control. For high-frequency PWM applications, engineers should instead refer to the engineering guide for IGBT modules.
• Is the base plate of the TM400HA-2H electrically hot?
  No, the module features internal ceramic isolation rated for 2500V AC. This means the case is electrically isolated from the active silicon, allowing multiple modules to be mounted on a single grounded heatsink.

For more technical documentation or to discuss integration requirements for your power stage, contact our technical sales team for data-backed support on your next procurement cycle.