New Littelfuse TVS Diodes Cut Clamping Voltage by Up to 15% for DC Line Protection

Foldback technology safeguards DC/DC converters in PoE, servers, industrial power supplies

ROSEMONT, Ill July 29, 2025 — Littelfuse, Inc. (NASDAQ: LFUS), an industrial technology manufacturing company empowering a sustainable, connected, and safer world, today announced the launch of the 5.0SMDJ-FB TVS Diode Series, a 5000 W surface-mount solution in a DO-214AB package engineered to protect sensitive DC power lines from overvoltage transients.

The new series incorporates foldback technology, which delivers up to 15% lower clamping voltage (VC) compared to traditional solutions, while maintaining Breakdown Voltage (VBR) above the Reverse Standoff Voltage (VR). This key differentiator ensures reliable protection for increasingly sensitive downstream components—especially next-generation DC/DC converters—without compromising system integrity.
“The 5.0SMDJ-FB Series addresses a critical design challenge: how to safeguard increasingly sensitive DC/DC converters and other power supply components from destructive transient surges,” said Jenny Chen, Product Manager, Protection Semiconductor Business Unit at Littelfuse. “By achieving up to 15% lower clamping voltage for the same standoff voltage, our foldback technology enhances circuit protection performance in high-reliability applications like data centers and industrial systems.”
Key features and benefits of the 5.0SMDJ-FB Series include:

• Foldback technology for lower clamping voltage, improving protection against electrical fast transients (EFT), electrostatic discharge (ESD), and other overvoltage conditions.
• Breakdown Voltage (VBR) is always greater than Reverse Standoff Voltage (VR)—ideal for maintaining DC power line stability.
• 5000 W peak pulse power rating, enabling robust protection in harsh electrical environments.
• Drop-in replacement to legacy 5.0SMDJ Series with the same compact DO-214AB (SMC) footprint.

These devices protect DC power lines across a variety of demanding applications, including:

• Power over Ethernet (PoE) systems
• AI and data center servers
• ICT equipment power supplies
• Industrial DC power distribution

As system designs evolve to include higher-performance and more compact DC/DC converters, the risk of transient-induced failures increases. The 5.0SMDJ-FB Series gives design engineers a solution that combines compact footprint, ease of integration, and advanced protection performance to meet those demands.

Availability

The 5.0SMDJ-FB TVS Diodes are available in tape and reel format in quantities of 3,000. Sample requests are accepted through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit Littelfuse.com.

For More Information
Additional information is available on the 5.0SMDJ-FB Series product page. For technical questions, please contact: Ben Huang, Product Marketing Director, ESBU, Bhuang@littelfuse.com.