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

­Littelfuse, Inc., an industrial technology manufacturing company empowering a sustainable, connected, and safer world, 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 go here.