As demand for intelligent and highly reliable systems continues to grow in automotive electronics and industrial applications, power protection and control solutions face new challenges¡ªincluding increased power density, enhanced diagnostic precision, and low-power design requirements. In response, WINSEMI has launched its new E-fuse product series. Centered on precision protection and intelligent control, these devices integrate high-accuracy protection, inrush current management, and fault diagnostics, offering robust solutions for automotive power distribution, battery management systems (BMS), and industrial power supplies.
Core Features of the E-Fuse Series
Technical Positioning
The E-fuse series is a core offering from WINSEMI, developed to address high-power system protection needs. Positioned as the central hub for protection and control, the E-fuse architecture utilizes external MOSFETs to allow scalable power design, supporting current ranges from tens to hundreds of amperes. Key functions include precise circuit protection, inrush current management, and temperature monitoring. The series is suitable for automotive, industrial automation, and energy storage applications where safety, reliability, and energy efficiency are critical. Built with advanced manufacturing processes and a fault detection mechanism that achieves 99% diagnostic coverage, the series ensures system stability while reducing maintenance costs across the full product lifecycle.
Intelligent Core Functions
Precision Circuit Protection
- Adjustable I-t wire harness protection
- Programmable overcurrent protection
- Current sampling feedback
- Abnormal state alerts
- Short-circuit protection
- Overvoltage protection (58V and 100V versions)
- Undervoltage lockout
Inrush Current Control
Supports configurable soft start to suppress inrush currents and reduce system stress during power-up.
Dual-Mode Overtemperature Protection
- Mode 1: Outputs a voltage signal through the TMPO pin to trigger thermal shutdown via MCU
- Mode 2: Uses internal CPP/CPN comparators and external NTC thermistors to set custom temperature thresholds
Fault Management & Diagnostics
Supports configurable fault recovery and status indication to enhance maintenance efficiency.
High-Performance Gate Driving
Built-in pulse drivers provide 175mA/1400mA (on/off) peak current to ensure reliable MOSFET operation.
Product Models & Selection Guide
WS2410AT / WS2420AT: Designed for automotive 12V/24V systems (58V rated), supporting 1-/2-channel designs; suitable for power distribution and motor control.
WS2510AT / WS2520AT: QFN packages with 100V rating, ideal for high-voltage BMS and DC-DC converters in new energy vehicles.
Products with no direct market equivalents are based on WINSEMI¡¯s proprietary designs, addressing gaps in high-voltage multi-channel E-fuse solutions.
Technical Advantages & Competitive Edge
Three Advantages of External MOSFET Architecture
- Power Scalability & Design Flexibility: Supports custom MOSFET selection for current ranges from tens to hundreds of amperes. A single chip can support multiple power levels, reducing BOM components by ~30% and accelerating product development.
- Thermal Management & Power Density Optimization: Compatible with packages such as PDFN5060, TOLL, and LFPAK to address thermal bottlenecks in high-power systems, improving output stability and reliability.
- Cost Optimization: Enables precise MOSFET selection to meet application power needs, minimizing overdesign. Economical options available for low-power scenarios.
Reliability Highlights
- Robust, Long-Life Design: Operating junction temperature up to 250¡ãC with strong EMI resistance. Complies with AEC-Q100 and Grade-0 standards for harsh environments.
- 99% Fault Diagnostic Coverage: Supports ISO 26262 functional safety standards, providing near-complete fault detection for automotive and industrial safety-critical applications.
- Fast Response & Harness Protection: 10¦Ìs short-circuit response time. Built-in harness protection prevents cable and connector damage due to external faults like overvoltage or short circuits.
- Ultra-Low Power Consumption: Sleep mode <15¦ÌA, idle mode <50¦ÌA. Ideal for battery-powered and low-power IoT applications.
Dual-Mode Capacitive Load Drive
- Mode 1: SA/SB pins provide a stable 15mA current source in IDLE mode for fast charging and efficient driving.
- Mode 2: Supports external pre-charge MOSFET configuration to flexibly adapt to different capacitive loads, enabling precise control of charging rate and drive behavior.
Application Scenarios
Automotive Power Distribution
Manages main power distribution and safely disconnects fault-prone power domains, protecting vehicle wiring.
Battery Management Systems (BMS)
Provides microsecond-level protection against cell overvoltage, undervoltage, and overcurrent with minimal power consumption.
DC-DC Converter Output Protection
Quickly isolates converters in the event of failure, ensuring overall system safety.
Future Outlook
WINSEMI plans to further expand the E-fuse product line with models featuring higher voltage ratings (200V+) and additional channels (4+), continuing to support innovation in automotive electronics, industrial automation, and renewable energy. By advancing its E-fuse technologies, WINSEMI aims to help engineers design safer, smarter, and more efficient systems.
