Content last revised on June 12, 2026
SanRex PD55F160 Fast Recovery Diode Module | 1600V 55A Power Rectification Solution
The SanRex PD55F160, a cornerstone of the SanRex Fast Recovery Diode (FRD) series, is a high-performance dual diode module engineered for precision high-frequency power conversion. This module offers a 1600V repetitive peak reverse voltage and a 55A average forward current, providing a robust solution for engineers tackling switching losses in industrial environments. By integrating two diodes in a series configuration within an isolated F-type package, the PD55F160 significantly simplifies thermal design while maintaining high dielectric strength. For 1200V systems requiring even higher surge capacities, the related MDS200A1600V offers a comparative bridge rectification alternative.
Key Technical Specifications: 1600V V_RRM | 55A I_F(AV) | 250ns T_rr (max). Two primary engineering benefits include a highly isolated mounting base for multi-module heat sink sharing and a soft-recovery characteristic that inherently suppresses electromagnetic interference (EMI). A common technical query for this model involves its efficacy in 480V three-phase input stages; the PD55F160 provides a substantial 1600V safety margin, effectively neutralizing voltage transients and reflected EMF in inductive load switching. For engineers prioritizing long-term thermal reliability in high-frequency power stages, the PD55F160 stands as an optimal choice.
Key Parameter Overview
Decoding the Specs for Enhanced Thermal Reliability
The following technical data is derived directly from official SanRex engineering documentation. Understanding these grouped parameters is essential for calculating safety margins and thermal dissipations in complex power topologies.
| Maximum Ratings (Tj = 25°C unless otherwise specified) | |
|---|---|
| Repetitive Peak Reverse Voltage (V_RRM) | 1600V |
| Average Forward Current (I_F(AV)) | 55A (Single Phase, Half Wave) |
| Surge Forward Current (I_FSM) | 900A (60Hz, 1/2 Cycle, Peak value) |
| Operating Junction Temperature (Tj) | -40°C to +150°C |
| Isolation Breakdown Voltage (V_ISO) | 2500V (A.C. 1 minute) |
| Electrical and Thermal Characteristics | |
|---|---|
| Maximum Forward Voltage Drop (V_F) | 1.35V (at I_F = 55A) |
| Reverse Recovery Time (t_rr) | 250ns (at I_F = 50A, di/dt = -100A/µs) |
| Thermal Resistance (Rth j-c) | 0.55 °C/W (Junction to Case) |
| Reverse Leakage Current (I_RRM) | 15mA (at V_RRM, Tj = 150°C) |
Download the PD55F160 datasheet for detailed specifications and performance curves: Request Datasheet Access.
Application Scenarios & Value
Achieving System-Level Benefits in High-Frequency Power Conversion
For engineers designing high-density UPS (Uninterruptible Power Supply) or industrial Welding Power Supplies, managing reverse recovery losses is a primary challenge. The PD55F160 serves as a critical component in the output rectification stage or the feedback loop of high-frequency inverters. In a typical Variable Frequency Drive (VFD) application, the "soft" recovery behavior of the PD55F160 prevents the sharp voltage spikes that often lead to insulation breakdown in downstream motor windings.
Consider a high-fidelity engineering scenario involving a 50kW industrial induction heater. During the high-speed switching of the primary bridge, standard diodes often exhibit "snapping" behavior during recovery, which generates significant EMI and requires bulky snubber circuits. By utilizing the PD55F160, the 250ns recovery time ensures a smooth transition, allowing for smaller passive components and a more compact PFC stage design. The 2500V isolation rating further facilitates the mounting of multiple PD55F160 modules on a single common heat sink without additional insulating pads, significantly reducing assembly time and the Total Cost of Ownership (TCO).
In systems requiring precise current sensing and control, the related SKM150GB12V can be utilized in the inverter portion, while the PD55F160 handles the critical input rectification or freewheeling diode duties. For more insights on module integration, refer to our guide on IGBT and Diode Module Selection.
Technical Deep Dive
A Closer Look at the Soft Recovery Advantage for Long-Term Reliability
The engineering excellence of the PD55F160 lies in its carrier lifetime control technology. To understand why this matters, imagine a fast-moving car (the current) approaching a red light (the switching off phase). A standard diode acts like a car slamming on the brakes; it stops instantly, but the sudden momentum transfer causes the whole vehicle to shake (electrical oscillation or EMI). The SanRex PD55F160, however, behaves like a car with a high-end shock absorber system. As the current falls to zero, the module manages the charge carrier sweep-out in a controlled, "soft" manner, decelerating the current transition without the violent snap-back associated with lower-grade components.
This soft-recovery characteristic directly impacts the Safe Operating Area (SOA) of the entire power stack. By limiting the $dv/dt$ (rate of voltage change) during the recovery interval, the PD55F160 reduces the stress on the gate drive and adjacent semiconductor switches. Furthermore, the 0.55 °C/W thermal resistance ensures that even under high-frequency Switching Loss conditions, the junction temperature remains well within the 150°C limit. This thermal headroom is vital for maintaining MTBF (Mean Time Between Failures) in environments like medical imaging or solar inverters, where downtime is not an option. Detailed failure mode prevention strategies can be found in our technical article on preventing power semiconductor failure.
Frequently Asked Questions
How does the PD55F160's 250ns t_rr directly impact the selection of snubber circuits?
The relatively fast and soft recovery of the PD55F160 minimizes the energy stored in stray inductances during turn-off. This allows engineers to use smaller Snubber Circuits or, in some optimized layouts, eliminate them entirely, which reduces overall system complexity and parasitic losses.
What is the primary benefit of the isolated F-type package in multi-module designs?
The 2500V isolation allows the PD55F160 to be mounted directly to a grounded metal chassis or heat sink. This eliminates the need for external isolation hardware, which traditionally increases Thermal Resistance. By optimizing the thermal path, the module supports higher current densities in a smaller footprint.
For engineering teams evaluating the SanRex PD55F160 for next-generation power platforms, its combination of high voltage ruggedness and switching efficiency offers a proven foundation for reliable design. Contact our technical sales department to discuss your specific load profiles and thermal requirements.
