The X3C35F1-02S from TTM Technologies is a Directional Coupler with Frequency 3.3 to 4.2 GHz, Coupling 1.9 dB, Coupling Variation ±0.15 dB, Directivity 16 to 21 dB, Power 10 to 15 W. Tags: Surface Mount. More details for X3C35F1-02S can be seen below.