Littelfuse, Inc. has introduced the compact 777 series Fuse to provide protection for higher-wattage wall-mount chargers for battery-powered electronic equipment. Although chargers for earlier generations of mobile phones had relatively low wattage (typically about 5 W), today’s highly compact chargers must often be able to handle 10 to 15 W of power, which requires withstanding higher levels of current. The axial lead, 3.6 mm by 9 mm 777 series Fuse incorporates an innovative type of filler material that provides a finely tuned balance between the surge tolerance necessary to prevent nuisance fuse tripping with the fuse’s ability to open safely when a short-circuit occurs. The 777 series’ robust design lets it withstand up to 24 hits of 7.5 kV ringwave surge; it will open safely on a direct short condition without producing soot, sparks, and sounds. Typical applications include wall-mount smartphone and tablet chargers and 10 to 20 W power supply modules for other battery-powered consumer electronics.
“From the consumer perspective, everybody wants their mobile electronic devices to recharge quickly, so they can get back to using them in the way they were intended. The 777 series Fuse allows circuit designers to engineer fast, compact, and economical chargers that don’t compromise user safety,” said Daniel Wang, product manager for the 777 series Fuse line.