Littelfuse announce new POLYFUSE resettable PPTC resistor series

The POLYFUSE LoRho Surface Mount Resettable PPTC series offers ultra-low internal resistance while maintaining the high level electrical characteristics and performance provided by standard PPTC products from Littelfuse.



Littelfuse LoRho PPTC devices provide overcurrent protection against fault current surges by limiting the electrical current flowing through the device. When a fault current flows through the device, it generates heat, which causes the device’s internal resistance to rise rapidly, limiting the current flow to the circuit downstream to a safe level. After the overcurrent condition passes, the device’s internal resistance drops back to its normal low resistance state, restoring the circuit to its normal operating condition. By resetting automatically, this device offers a low maintenance alternative to one-time fuses for overcurrent protection.



Matthew Chan, Global Product Manager for the Littelfuse LoRho PPTC Series, says, “This series, with its ultra-low internal resistance characteristics, offers the ideal solution for overcurrent protection of electronic product applications where ultra-low voltage drop and minimal power dissipation are also critical.



In comparison with standard SMD PPTCs on the market, Littelfuse LoRho™ SMD PPTCs have significantly lower internal resistances (from 45 percent to more than 60 percent lower) and drastically reduced thicknesses (more than 50 percent thinner).



The LoRho Surface Mount Resettable PPTC series offers circuit designers a variety of key benefits:



-They are available in sizes as small as 0402 (the smallest footprint PPTC in the market), which helps saves board space, allowing more room for other components.



-With the industry’s broadest range of hold current ratings (100mA to 7A), they offer high design flexibility, making it easy to design in the most suitable device for the application.



-A very thin height profile makes the series suitable for use in compact portable electronics.



-Their fast response to fault currents provides secure protection for sensitive electronic products.



-By resetting automatically, they provide a low maintenance alternative to one-time fuses for overcurrent protection.



-They are RoHS compliant, lead free, halogen free, and UL and TUV recognized, which ensures they are environmentally friendly and compliant with international safety standards.



-They are compatible with high temperature solders, so they meet lead-free soldering requirements.



Littelfuse LoRho SMD PPTCs offer the best overcurrent protection solution for meeting today’s low power dissipation requirements of Li ion/Li Polymer battery packs. Other applications for these devices include handheld electronics (smartphones, mp3 players, digital cameras, video cameras, and e-readers), computer and peripherals (desktop and notebook computers, tablet PCs, audio/data/video cards, LCD and LED displays, USB thumb drives and data storage devices, USB 3.0 and 2.0 ports, PC motherboards), and gaming consoles and accessories.