Melexis has introduced the MLX91299, a silicon-based RC snubber designed for use with silicon carbide (SiC) power modules in automotive and industrial high-voltage systems. The device combines a resistor and a capacitor in a compact structure that supports the mitigation of voltage transients, oscillations, and parasitic effects that commonly occur in wide-bandgap power electronics operating at fast switching speeds.
SiC power modules can experience voltage overshoots, high-frequency ringing, and switching-related leakage currents that place thermal and electrical stress on system components. Integrating an RC snubber reduces these effects and improves system stability. Early evaluations indicate that the device can reduce switching losses, supporting power-density improvements, reduced module heating, and potential simplification of cooling and material requirements.
The MLX91299 uses a silicon process and form factor suited for integration within high-voltage modules. Its structure is compatible with standard assembly techniques for SiC devices, and backside metallization allows attachment using sintering or soldering methods. This enables the device to share thermal pathways with SiC components and maintain performance at junction temperatures up to 200 °C.
By managing parasitic oscillations and voltage spikes, the RC snubber improves electromagnetic compatibility and reduces electrical stress during high-speed transitions. This supports long-term reliability at elevated switching frequencies and provides a controlled damping network within the module. With a breakdown voltage above 1,500 V, the device can be used in traction inverters, onboard chargers, DC-DC converters, and other high-voltage systems.
The MLX91299 is the first member of Melexis’ protective-device product line and is available for sampling. Additional variants will expand support for future high-voltage applications.
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