The BD0810J50200AHF from TTM Technologies is a Balun with Frequency 800 MHz to 1 GHz, Amplitude Balance ±0.6 to 1.1 dB, Phase Balance 5.9 to 8 Degree, Insertion Loss 0.7 to 1 dB, Power 2 W. Tags: Surface Mount, Balanced to Unbalanced. More details for BD0810J50200AHF can be seen below.