The BD1631J50100AHF from Anaren Inc is a Balun with Frequency 1.6 to 3.1 GHz, Amplitude Balance ± 1 dB, Phase Balance 5 Degree, Insertion Loss 1 dB, Power 2 W. Tags: Surface Mount, Unbalanced to Balanced. More details for BD1631J50100AHF can be seen below.