The ZM4748A is a Zener Diode LL-41 manufactured by Semtech that meets the Restriction of Hazardous Substances (RoHS) compliance. It is a silicon zener diode designed for general-purpose applications. It is a three-terminal, 40V device with a maximum power dissipation of FORWARD 250 mW. It also features high breakdown voltages, tight parameters distribution, low leakage current, and a wide operating temperature range from -55C to +125C. Its rated peak power pulse is 1,000 mW, with peak pulse current of 1A. It is widely used in voltage regulators, switching circuits, and voltage stabilizers.