The BD0810J50100AHF from Anaren Inc is a Balun with Frequency 800 MHz to 1 GHz, Amplitude Balance ± 0.4 dB, Phase Balance 2 Degree, Insertion Loss 0.95 dB, Power 2 W. Tags: Surface Mount, Unbalanced to Balanced. More details for BD0810J50100AHF can be seen below.