The TC4-1W-17LN+ from Mini Circuits is a Balun with Frequency 100 to 500 MHz, Insertion Loss 0.64 to 0.89 dB, Current 150 mA, Power 0.25 W, Return Loss 13.95 to 22.06 dB. Tags: Surface Mount, Unbalanced to Balanced. More details for TC4-1W-17LN+ can be seen below.