IXYS MDD95-12N1B | High-Reliability 1200V Dual Diode Module
The IXYS MDD95-12N1B is a high-performance dual diode module engineered for demanding power conversion applications. Housed in a standard, industry-proven package, this module integrates two series-connected rectifier diodes, offering a streamlined solution for engineers designing robust single-phase rectifiers, battery chargers, and industrial power supplies. The core value of the MDD95-12N1B lies in its blend of electrical ruggedness, superior thermal performance, and simplified assembly, directly addressing common challenges in modern power electronics design.
Technical Deep Dive: Engineered for Durability and Efficiency
Direct Copper Bonded (DCB) Ceramic Baseplate
At the heart of the module's reliability is its Direct Copper Bonded (DCB) Alumina (Al2O3) ceramic substrate. This construction provides exceptional electrical isolation (2500V~) between the active components and the heatsink.
- Technical Principle: DCB technology fuses a copper layer directly to a ceramic insulator without an adhesive layer. This creates a thermally efficient and mechanically robust bond with a low coefficient of thermal expansion mismatch.
- Application Value: This eliminates the need for fragile and thermally inefficient insulating pads, simplifying heatsink mounting and drastically improving heat transfer. The result is lower junction temperatures, enhanced reliability under thermal cycling, and a longer operational lifespan for your entire system.
Planar Passivated Diode Chips
The IXYS MDD95-12N1B utilizes planar passivated diode chips, a key factor in its long-term stability.
- Technical Principle: Passivation involves applying a protective layer (typically glass) over the semiconductor junction. This process shields the sensitive junction area from environmental contaminants and electrical fields, preventing leakage current drift over time.
- Application Value: For designers, this means predictable, stable blocking voltage characteristics throughout the product's life. It ensures system integrity and prevents premature failures, a critical requirement in industrial automation and uninterruptible power supply (UPS) systems where uptime is paramount.
Multi-Dimensional Application Scenarios
- Industrial Power Supplies & Rectifiers: By using two MDD95-12N1B modules, you can construct a full-bridge single-phase rectifier capable of handling up to 120A. This modular approach significantly reduces component count, simplifies wiring, and minimizes assembly time compared to using four discrete high-power diodes.
- Battery Charging Systems: The module's high average forward current rating (120A) and robust surge current capability are ideal for high-power battery chargers for forklifts, electric vehicles, and backup power systems. The inherent isolation enhances the safety of the charging circuit.
- Welding Equipment: In the output stage of welding machines, diodes must withstand repetitive high-current pulses. The rugged construction and efficient thermal management of the IXYS MDD95-12N1B ensure it can reliably perform in these harsh, high-stress environments.
- Freewheeling Diode in Converters: This module serves as an excellent freewheeling or anti-parallel diode in medium-frequency power converters, protecting switching devices like IGBTs from inductive voltage spikes. For more advanced switching solutions, explore more IGBT Modules that pair perfectly with this diode.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Repetitive Peak Reverse Voltage (VRRM) | 1200 V |
| Average Forward Current (IFAV) @ TC=85°C | 120 A |
| Forward Voltage (VF) @ IF=100A, TVJ=25°C | 1.15 V (Typ.) |
| Surge Forward Current (IFSM), 10ms, 50Hz | 1550 A |
| Operating Junction Temperature (Tvj max) | 150 °C |
For a comprehensive list of parameters, please refer to the official MDD95-12N1B Datasheet.
Selection Guidance: MDD95-12N1B vs. Discrete Diodes
When designing a rectifier, engineers often weigh module solutions against discrete components (e.g., two TO-247 diodes). While discrete diodes may offer layout flexibility on a crowded PCB, the IXYS MDD95-12N1B presents a compelling case for systems where reliability and ease of manufacturing are key. The module guarantees matched thermal performance between the two diodes, simplifies inventory management (one part number vs. two), and drastically reduces assembly costs by minimizing manual mounting and wiring steps. For applications above 5kW, the superior thermal path of a module is almost always the more robust and cost-effective long-term solution.
Frequently Asked Questions (FAQ)
- Can this module be used in a three-phase rectifier bridge?
Absolutely. Three MDD95-12N1B modules can be configured to create a highly reliable B6 three-phase rectifier bridge, commonly used in the input stage of AC motor drives and servo controllers. - What is the primary benefit of the module's series connection?
The series connection is ideal for building a common-cathode or common-anode leg for various converter topologies, including half-bridge rectifiers or as part of a full-bridge rectifier with a center-tapped transformer. It simplifies the busbar or PCB layout significantly. - How do I ensure optimal thermal performance?
For best results, use a thin, even layer of thermal grease between the module's baseplate and a clean, flat heatsink surface. Ensure proper mounting torque is applied to the terminal screws as specified in the datasheet. For specific application advice or a quote, please Contact Us for a Quote.