Littelfuse Launches Industry’s Smallest 3 kA TVS Diode in Compact Surface Mount Package

­Littelfuse, Inc. announced the launch of the DFNAK3 Series of High-Power TVS Diodes. These compact surface mount devices deliver 3 kA (8/20 µs) surge current protection—the highest available in such a small footprint—making them ideal for safeguarding DC-powered systems and Power over Ethernet (PoE) applications in demanding environments.

Unlike traditional high-surge TVS diodes that come in bulky axial-leaded or large surface mount packages, the DFNAK3 Series uses a compact DFN package—making it the smallest 3 kA-rated TVS diode on the market today. It offers a 70% smaller footprint than overcoated alternatives and is also 70% lower in height than standard SMD-type coated packages. This enables space-constrained, high-density PCB designs without compromising surge performance or system robustness.

“The DFNAK3 Series empowers designers to meet today’s miniaturization and performance demands,” said Jenny Chen, Product Marketing Manager, Protection at Littelfuse. “It enables compact, high-density system designs while delivering the same high surge rating as bulkier components—ensuring robust protection for mission-critical applications such as PoE, remote radio units, and data center power supplies.”

Engineered to meet IEC 61000-4-5 Level 4 requirements, the DFNAK3 Series provides a compelling alternative to standard TVS diodes, MOVs, and GDTs, thanks to its lower clamping voltage and superior transient suppression. The surface mount configuration also supports cost-effective, automated PCB assembly, reducing overall production complexity.

Key Features and Benefits

• 3 kA (8/20 µs) surge current rating for high-reliability DC and PoE systems
• Compact DFN surface mount packages save up to 70% PCB space
• Lower clamping voltage for superior protection of sensitive downstream electronics
• Breakdown voltage above reverse standoff voltage ensures reliable DC line and PoE protection
• Aids compliance with IEC 61000-4-5 (Level 4) and other surge protection standards

Target Applications

• DC bus protection for Small Cells, Remote Radio Units (RRUs), and Baseband Units (BBUs)
• Power over Ethernet (PoE) systems
• DC power supplies in AI infrastructure and data center servers
• Industrial DC power supplies operating in harsh environments

The DFNAK3 Series continues the Littelfuse mission to deliver innovative surface mount protection solutions in response to evolving customer needs for higher performance in smaller form factors.

Availability

The DFNAK3 TVS Diodes are available in tape and reel format in quantities of 1,500. Sample requests are accepted through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please go here.