The FAN5403UCX is a Lithium-Ion/Polymer battery charger manufactured by Fairchild/ON Semiconductor. It is available in reel - TR packaging and has fault protection for over temperature, over voltage, and short circuit. The charging current is constant-programmable and has programmable features for current, timer, and voltage. The charge current-max is 1.25A and the battery pack voltage is 4.5V (Max). The FAN5403UCX has a temperature range for operating of -30°C to 85°C (TA) and is mounted using SMD (SMT) technology. The quantity per package is 3k pcs.