The 3W525S from TTM Technologies is a Balun with Frequency 1.8 to 2.5 GHz, Amplitude Balance ± 0.4 dB, Phase Balance 5 Degree, Insertion Loss 0.35 to 0.38 dB, Power 150 W. Tags: Surface Mount, Balanced to Unbalanced. More details for 3W525S can be seen below.