Wednesday, May 23, 2018
Publication Date: 12/1/2008
Archive >  December 2008 Issue >  New Products > 

Littelfuse Intros Hi-Temp SMT Fuse Line
Hi-temp SMT fuses.
Des Plaines, IL — Littelfuse, Inc. has introduced the 438 Series — the first 0603-size, fast-acting surface-mount fuse rated for working temperatures up to 150°C. The new product continues a line expansion which added the company's 501 Series and 437 Series earlier this year. Like those fuses, the new 438 Series is suitable for electronics applications with high ambient operating temperatures.

In addition, the new fuse extends reliable DC circuit protection to applications that are extremely space-limited; the 438 Series fuse is one fourth the size of the 437 Series fuse.

Unlike competing fuses, the 438 Series operates effectively in temperatures ranging from -55 up to +150°C without nuisance tripping. The 438 Series ceramic fuse has a temperature rating 20 percent higher than its closest competitor, and it has the ability to respond quickly to overcurrents without nuisance tripping caused by high inrush currents.

There is a growing need for protection in electronic applications in which high ambient operating temperatures are common. For example, LCD inverters, LCD TVs, LCD monitors, notebook computers, hard disk drives, XDSL modems, set-top boxes, and gaming consoles may experience temperature extremes. The 438 Series fuse provides high nominal melting rating (l2t) up to 1.38A2s (6A current rating), which coupled with high Interrupt Rating (50A) across all current ratings (250mA to 6A), enables the 438 to operate reliably over a wide temperature range, minimizing nuisance trips during momentary overload conditions.

The 438 Series includes UL and CSA agency approval and is available in current ratings from 250mA to 6A allowing this series of fuses to be used in a variety of applications. Each fuse has a maximum fault current rating (Interrupt Rating) of 50A and is 100 percent lead-free, halogen-free, and RoHS compliant.

Contact: Littelfuse, 800 E. Northwest Highway, Des Plaines, IL 60016 800-999-9445 or 847-824-1188 fax: 847-391-0894 Web:

search login