QuadroMELF Diodes Vishay Semiconductor QuadroMELF Diodes are small signal schottky and switching diodes in a QuadroMELF surface-mount package. The QuadroMELF Diodes include the BAQ13x, BAS28x, BAV20x, LS101x, LS103A, LS4148, LS4150, LS4151, LS4154, and LS4448 series. The Vishay Semiconductor QuadroMELF Diodes are ideal for wide variety of applications including extreme fast switches, small battery chargers, and protection circuits.