Content last revised on June 23, 2026
SKKE162/18 Semikron 1800V 162A Rectifier Diode Module
The SKKE162/18, a cornerstone of the Semikron SEMIPACK 2 family, represents a high-reliability rectification solution for industrial power conversion. By utilizing a hard-soldered joint structure and an isolated aluminum oxide ceramic baseplate, this module provides an optimized thermal path for demanding 690V line applications. For engineers prioritizing long-term thermal stability in uncontrolled rectification stages, the SKKE162/18 offers a robust 1800V blocking voltage and a 162A nominal forward current capacity.
Top Specifications: 1800V | 162A | Rth(j-c) 0.16 K/W
- Enhanced Reliability: Hard-soldered joints minimize thermal fatigue during heavy power cycling.
- High Safety Margin: The 1800V Vrrm provides critical protection against transient overvoltages in industrial grids.
What is the primary benefit of the SKKE162/18's ceramic insulation? It ensures high isolation voltage (3600V AC) while maintaining a low thermal resistance path to the heatsink. For 690V industrial drives prioritizing thermal margin, this 1800V module is the optimal choice.
Key Parameter Overview
Decoding the Specs for Enhanced Thermal Reliability
The following technical data is derived from the official Semikron SKKE162/18 documentation. This module is designed for heat transfer through an isolated metal baseplate, making it suitable for compact chassis integration.
| Symbol | Parameter Description | Value (Unit) |
|---|---|---|
| Vrrm | Repetitive Peak Reverse Voltage | 1800V |
| Ifav | Forward Current (at Tc = 85°C) | 162A |
| Ifsm | Surge Forward Current (10ms, sin 180) | 5400A |
| I2t | Admissible Surge Current Integral | 145,000 A²s |
| Vf | Maximum Forward Voltage (at If = 500A) | 1.55V |
| Rth(j-c) | Thermal Resistance Junction to Case | 0.16 K/W |
| Visol | Isolation Voltage (AC 50Hz, 1 min) | 3600V |
Download the SKKE162/18 datasheet for detailed specifications and performance curves.
Application Scenarios & Value
Achieving System-Level Benefits in High-Power Rectification
In high-fidelity engineering scenarios, such as welding power supply design, the SKKE162/18 addresses the challenge of high-frequency thermal cycling. When a welding power supply initiates, it often generates significant current surges. The 5400A Ifsm rating ensures the module survives these transient peaks without degrading the internal semiconductor junctions.
Beyond welding, this module is a staple in Variable Frequency Drive (VFD) input stages and high-capacity UPS systems. In these environments, the 1800V Vrrm provides a necessary buffer against voltage spikes commonly found in IEC 61800-3 compliant industrial motor drives. While the SKKE162/18 is a single diode module, for systems requiring dual-diode configurations in the same footprint, the related SKKD162/18 offers a similar 1800V rating in a different topology.
For designers working on battery chargers or DC power supplies, the low Rth(j-c) of 0.16 K/W allows for higher power density. By efficiently moving heat away from the junction, engineers can reduce the size of the required heatsink or operate the system in higher ambient temperatures without compromising the 162A current handling. To better understand how these thermal metrics impact your overall design, consult our guide on why Rth matters in power module selection.
Technical Deep Dive
A Closer Look at the Thermal Management and Baseplate Design
The SKKE162/18 utilizes a SEMIPACK 2 housing that features a ceramic isolated metal baseplate. To understand the impact of this design, consider an analogy: thermal dissipation in a power module is like an 8-lane highway. In older, non-isolated designs, heat had to navigate "narrow side streets" (high thermal resistance layers), leading to "traffic jams" (heat buildup). The SKKE162/18's aluminum oxide ceramic layer acts as the high-speed highway, allowing heat to flow directly and rapidly to the heatsink.
Another critical design element is the 1800V Vrrm. This is effectively the module’s "voltage safety net." Using an 1800V rated diode on a standard 600V industrial line is like using a bridge rated for 50 tons to carry a 10-ton truck. This 3x safety factor is vital for surviving line transients and inductive flyback energy that could catastrophically fail a module with a lower voltage rating. This physical robustness is essential for maintaining high system-level efficiency and preventing unplanned downtime.
FAQ
How does the 1800V Vrrm affect the reliability of the SKKE162/18 in a 480V grid?
In a 480V system, the peak voltage is approximately 678V. An 1800V Vrrm provides a safety margin of over 2.5x, significantly reducing the risk of failure due to grid transients or lightning strikes, which is critical for ensuring long-term reliability.
Can the SKKE162/18 be used in non-isolated heatsink environments?
Yes. Because the SKKE162/18 features an internal isolation voltage of 3600V, the baseplate can be mounted directly to a grounded heatsink without the need for additional insulating pads, simplifying the mechanical assembly and improving thermal transfer.
What is the impact of the 145,000 A²s I2t rating on fuse selection?
The I2t value determines the module's ability to withstand short-circuit energy. Engineers must select a FUSE with a "let-through" energy rating lower than 145,000 A²s to ensure the fuse clears before the SKKE162/18 sustains permanent damage.
How does the junction temperature (Tvj) limit affect the 162A current rating?
The 162A rating is typically valid at a case temperature of 85°C. As the junction temperature approaches its maximum limit (usually 150°C), the forward current must be derated. Accurate Thermal Management is required to ensure the junction stays within safe limits during continuous operation. For more on this, see our article on diagnosing failure modes in power semiconductors.
Strategically, the SKKE162/18 remains a vital component for industrial infrastructure, particularly as global power grids face increasing instability. By providing a massive voltage overhead and proven thermal packaging, it secures the "rectification bottleneck" in modern VFD and UPS architectures. For more information on sourcing these components or technical integration, explore the semikron official technical resources.
