Content last revised on December 28, 2025
SanRex PK200FG120 Power Diode Module | High-Reliability 1200V 200A Rectification
The SanRex PK200FG120, a cornerstone of the SanRex Power Diode Module family, offers a high-performance solution for demanding industrial rectification tasks where thermal stability and voltage headroom are non-negotiable.
1200V | 200A | Isolated Case Design
Key Benefits:
Enhances system reliability via superior Thermal Resistance management.
Simplifies multi-module layouts with a high-insulation isolated mounting base.
What is the primary benefit of its isolated mounting design? It enables simplified heatsink assembly and improves electrical safety by providing high-voltage insulation between the circuit and the base. For industrial rectifiers prioritizing thermal robustness, this 1200V module is the optimal choice.
Application Scenarios & Value
Achieving System-Level Benefits in High-Efficiency Power Conversion
In the landscape of modern industrial electronics, the SanRex PK200FG120 is engineered to meet the rigors of heavy-duty power conversion. A primary engineering challenge in Variable Frequency Drive (VFD) front-end rectifiers is managing the initial surge during capacitor pre-charging. With its high IFSM (Surge Forward Current) rating, the PK200FG120 provides a robust buffer against these transient events, preventing premature component fatigue.
This module is frequently integrated into high-capacity Welding Power Supply systems. In these environments, the rapid thermal cycling caused by intermittent high-current loads can degrade standard solder-bonded devices. The PK200FG120 utilizes specialized internal interconnects that mitigate these thermal stresses, ensuring a long service life in 24/7 manufacturing plants. For systems requiring alternative configurations, engineers often evaluate related models such as the MDS200A1600V to find the precise fit for their specific voltage topography.
Beyond welding, this dual-diode configuration is ideal for Battery Charging stations and large-scale UPS (Uninterruptible Power Supply) units. The 1200V repetitive peak reverse voltage rating provides a significant safety margin for 400V and 480V AC line applications, protecting sensitive downstream components from line spikes and inductive kickbacks.
Key Parameter Overview
Decoding the Specs for Enhanced Thermal Reliability
The following technical data reflects the baseline performance of the SanRex PK200FG120 under standard operating conditions. Effective system design requires a deep understanding of how these parameters interact within a Thermal Management strategy.
| Functional Group | Parameter | Official Value |
|---|---|---|
| Voltage Ratings | Repetitive Peak Reverse Voltage (VRRM) | 1200V |
| Voltage Ratings | Non-Repetitive Peak Reverse Voltage (VRSM) | 1300V |
| Current Ratings | Average Forward Current (IF(AV)) | 200A (at Tc=98°C) |
| Current Ratings | Surge Forward Current (IFSM) | 4000A (60Hz, 1 cycle) |
| Thermal Data | Operating Junction Temperature (Tj) | -40 to +150°C |
| Thermal Data | Thermal Resistance (Rth j-c) | 0.18 °C/W |
| Mechanical | Isolation Voltage (Visol) | 2500V AC (1 minute) |
Download the PK200FG120 datasheet for detailed specifications and performance curves.
Technical & Design Deep Dive
A Closer Look at the Thermal Path and Surge Ruggedness
The internal architecture of the PK200FG120 is optimized for low forward voltage drop (V_F), which directly translates to reduced conduction losses. In high-power applications, even a 0.1V reduction in V_F at 200A significantly decreases the heat generated within the module. This efficiency gain allows for smaller heatsinks or higher current density within the same cabinet footprint.
A critical design consideration is the module's Rth(j-c) of 0.18 °C/W. To contextualize this, think of the thermal resistance as a narrow pipe; the lower the resistance, the faster the heat "water" can flow away from the silicon junction to the heatsink. This low value ensures that even under peak loads, the junction temperature remains well within the 150°C limit, safeguarding the module against thermal runaway. Understanding the nuances of power semiconductor thermal management is essential for achieving the decadal reliability expected in industrial infrastructure.
The 2500V AC isolation rating is achieved through a high-purity ceramic substrate. This allows multiple modules to be mounted on a single grounded heatsink, reducing the complexity and cost of the mechanical assembly. This "pressure contact" technology provides more uniform pressure across the diode chips compared to traditional wire-bonding, leading to superior power cycling capability.
Industry Insights & Strategic Advantage
Alignment with Global Energy Efficiency Standards
As global manufacturing pivots toward Industry 4.0 and more stringent energy efficiency regulations, the role of reliable rectification components has become paramount. The SanRex PK200FG120 aligns with these trends by enabling higher efficiency in the first stage of power conversion. By reducing waste heat, industrial facilities can lower their cooling costs, contributing to a lower Total Cost of Ownership (TCO).
The transition toward Renewable Energy integration, such as local DC microgrids, also benefits from the ruggedness of the PK series. These modules are increasingly found in the rectification stages of wind turbine pitch controllers and solar array combiner boxes, where they must withstand extreme ambient temperature fluctuations. The adoption of high-performance modules is a strategic move for OEMs aiming to meet the IEC 61800-3 standards for electromagnetic compatibility and reliability in adjustable speed electrical power drive systems.
FAQ
How does the IF(AV) rating of 200A at 98°C impact the design of an industrial rectifier?
The 200A rating at a case temperature (Tc) of 98°C indicates the module's ability to maintain high current throughput even when the heatsink temperature rises. For designers, this means the PK200FG120 offers a larger operating envelope compared to modules that require much lower case temperatures to reach the same current level, allowing for more compact thermal solutions.
Does the 1200V VRRM rating provide enough protection for a 480V AC line input?
Yes. In a standard 480V AC system, the peak line voltage is approximately 678V. A 1200V VRRM provides nearly a 2x safety margin, which is a standard engineering practice to protect against voltage transients and surges common in heavy industrial environments.
For procurement teams and lead engineers, securing reliable components like the SanRex PK200FG120 is a step toward future-proofing industrial hardware. For detailed pricing and current availability, please reach out to our technical sales department to discuss your specific project requirements.
