The BD3238N5050AHF from TTM Technologies is a Balun with Frequency 3.2 to 4.2 GHz, Amplitude Balance ±0.2 to 1.5 dB, Phase Balance 2 to 6 Degree, Insertion Loss 0.7 to 1.9 dB, Power 1 W. Tags: Surface Mount, Unbalanced to Balanced. More details for BD3238N5050AHF can be seen below.