As data centers, industrial systems, and PoE devices push the limits of performance, the pressure is on for circuit protection to keep up. Littelfuse has answered that challenge with the launch of its new 5.0SMDJ-FB TVS Diode Series, offering robust DC line protection with a unique twist: foldback technology that delivers up to 15% lower clamping voltage compared to traditional designs.
These 5000 W TVS diodes are housed in a compact DO-214AB (SMC) surface-mount package and engineered to shield sensitive DC power lines from overvoltage transients like electrical fast transients (EFTs), electrostatic discharge (ESD), and lightning-induced surges.
Why Foldback Matters
The core innovation in the 5.0SMDJ-FB series lies in its foldback technology. Traditional TVS diodes clamp transient voltages at a fixed level—but foldback reduces the clamping voltage once the transient starts to settle, keeping downstream components better protected without affecting normal operation.
This is particularly critical in modern applications where DC/DC converters are smaller and more sensitive than ever. Lower clamping voltage minimizes stress on these components, reducing the risk of damage or degraded performance.
Key Technical Features
-
Up to 15% lower clamping voltage thanks to Littelfuse’s foldback technology
-
5000 W peak pulse power rating for high-energy surge protection
-
Breakdown Voltage VBR always higher than Reverse Standoff Voltage VBR, ensuring DC line stability
-
Drop-in compatible with legacy 5.0SMDJ Series—no PCB redesign required
“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 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.”
Where It Fits
These devices are ideal for DC line protection in:
-
Power over Ethernet (PoE) equipment
-
AI and data center servers
-
Industrial power supplies
-
ICT hardware
-
DC distribution in rugged environments
In these systems, even minor overvoltage events can degrade sensitive silicon or introduce latent failures. The 5.0SMDJ-FB series ensures a balance between fast response, low clamping, and thermal stability, making it a solid choice for engineers tasked with protecting mission-critical infrastructure.
A Smarter Protection Strategy
As designs continue to shrink and efficiency demands rise, engineers need more than just basic protection—they need smarter protection. The 5.0SMDJ-FB Series offers a modern drop-in upgrade that doesn’t just meet spec sheets—it anticipates where systems are headed next.
