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Microchip High-Voltage Auxiliary E-Fuse Reference Design

Improve equipment uptime and adopt SiC with ease, speed and confidence

This Microchip technology demonstrator leverages the benefits of their 700V and 1200V Silicon Carbide mSiC™ products to provide a complete solution. The design also implements a Time-Current Characteristic (TCC) curve that helps you migrate to non-automotive applications such as DC solid-state circuit breakers.

Design Benefits

  • High-voltage solid-state relay with over-current protection
  • Optimal performance and efficiency
  • A proven solution that avoids sourcing individual parts
  • Risk reduction through reliability and accelerated development


  • Configurable current limit profile
  • LIN communication interface for configurability and diagnostics
  • High-side or low-side drive configuration
  • Short-circuit withstand time: 10 µs
  • Rated current: 30A
  • Low-voltage operating range: 9V to 16V
  • High-voltage operating range: 200V to 900V
  • Operating temperature range: −40°C to 85°C
  • Automotive hardware design that uses only AEC-qualified components
  • Six variants of this high-voltage auxiliary E-Fuse design that support 400V and 800V bus voltages and continuous current ratings of 10A, 20A and 30A
  • Up to 20 kHz switching frequency


  • Electric Vehicles (EVs)
  • Hybrid Electric Vehicles (HEVs)
  • DC smart grids
  • Industrial
  • Charging stations


Solution Diagram