Providing over-voltage and -current protection for 5V and 12V systems, the STEF05 and STEF12 fuses in 3 mm x 3 mm DFN packages replace larger fuses or devices like transils or diodes. They do not cut the power suddenly or require replacement after actuating. If a fault occurs, the components restrict current and ultimately turn the equipment off if faults persist. They reset via a signal from the system or by restarting the power supply. The devices provide a signal when intervening, allowing the system to generate a warning. If the fault persists after the reset, the fuse immediately limits current and turns off again. Prices start from $0.75 each/1,000. STMICROELECTRONICS, Lexington, MA. (888) 787-3550.