The 2500FB16A0400 from Johanson Technology is a Balun with Frequency 2.3 to 2.69 GHz, Phase Balance 10 Degree, Insertion Loss 3.8 dB, Power 0.5 W, Return Loss 9.5 dB. Tags: Ceramic, Surface Mount, Unbalanced to Balanced. More details for 2500FB16A0400 can be seen below.