There are 2 core configurations in the ERU series, first an E and I core combination and second, an E and E core combination. The E and E core will be addressed later in this training module. Target applications for the EPCOS Brand ERU chokes include but are not limited to non-isolated DC/DC converters, Buck / Boost / and Buck-Boost chokes, servicing Industrial and Telecommunications hardware. There are 3 main sizes, the ERU13, ERU20, and ERU25 which have a range of 0.44 µH to 35 µH and a saturation current handling capability up to 71 A. The EPCOS Brand ERU series with E and I core combinations feature specialized gapped Ferrite Cores, which produce low inductance tolerances, low magnetic losses, and constant inductance vs. DC current. The flat wire has low RDC and self-leaded pins allowing for low thermal resistance to PCB, then are bent under the I-Core to produce an extremely small footprint.