LPD4012 Coupled Inductors Coilcraft LPD4012 Series Coupled Inductors feature high inductance, high efficiency, and excellent current handling in a 1.1mm high by 4mm square design. The LPD4012 Series is ideal for use in flyback, multi-output buck, and SEPIC applications. The inductors can be used as two single inductors connected in series or parallel or as a common mode choke.