Littelfuse Expands Automotive TVS Portfolio with 600 W SZSMF6L Series for High-Energy Transient Protection

Compact SOD-123FL TVS diodes deliver 50% more peak power than SZSMF4L Series, helping engineers protect space-constrained EV and automotive electronics from high-voltage surges.

ROSEMONT, Ill., September 16, 2025 – Littelfuse, Inc. (NASDAQ: LFUS), a diversified, industrial technology manufacturing company empowering a sustainable, connected, and safer world, today announced the launch of the SZSMF6L Series of unidirectional and bidirectional TVS diodes. These 600 W automotive-grade devices provide robust protection against high-energy transients in a compact, surface-mount SOD-123FL package, making them ideal for increasingly space-constrained automotive and electric vehicle (EV) designs.

Building on the success of the 400 W SZSMF4L Series introduced in 2023, the SZSMF6L Series delivers 50% higher peak power handling while maintaining the same compact footprint. The improved surge protection and enhanced clamping performance help safeguard critical automotive systems exposed to voltage spikes from switching events, load dumps, or electrostatic discharge (ESD).

“The SZSMF6L Series addresses the evolving demands of EV and automotive system designers who need greater transient protection without compromising board space,” said Charlie Cai, Director Product Marketing SBU at Littelfuse. “With the transition to zonal architectures and the continued push for miniaturization, this 600 W solution offers engineers a more robust and thermally reliable alternative to the SZSMF4L for high-stress environments.”

Key Features and Benefits

• 600 W peak pulse power (10/1000 µs) in a small SOD-123FL package
• Working peak reverse voltage range: Unidirectional 5–75 V; Bidirectional 10–75 V
• Fast response time < 1 ns minimizes the threat window for transient events
• Planar chip design ensures low leakage current and consistent clamping performance
• High operating temperature up to 175 °C for harsh automotive environments
• AEC-Q101 qualified and PPAP capable, supporting automotive-grade change control
• >16 kV ESD rating (HBM Class 3) for sensitive interface and sensor protection

Applications

The SZSMF6L Series is suited for high-reliability transient protection in:

• EV Powertrain and Inverters
• Battery Management Systems (BMS)
• On Board Charging (OBC)
• Power Distribution Units (PDU)
• Body Control Modules
• Domain and Zone Controllers
• Automotive Lighting Systems

The SZSMF6L TVS diodes enable more efficient, compact, and rugged designs that meet the growing electrical demands of next-generation vehicles. Their performance and footprint compatibility allow seamless upgrade paths from the SZSMF4L when additional power handling is required.

Availability

The SZSMF6L Series SMD TVS Diodes are available in tape and reel packages of 5000. Place sample requests through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit Littelfuse.com.