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This is one LOT (Qty.1) of New Mini-Circuits SMD ADT1.5 Series Wideband RF Transformer, Part Number: ADT1.5-17. Ratio: 1.5:1 (Secondary/Primary), and Frequency Range: 0.5-1700MHz. Case Style: CD542

Data sheet:

http://www.minicircuits.com/pdfs/ADT1.5-17.pdf

Some reading material:

How RF Transformers Work: http://www.minicircuits.com/pages/pdfs/howxfmerwork.pdf

Balun Transformers: http://www.minicircuits.com/pages/BalunApplicationNote.htm

Case Style and Footprint: http://www.minicircuits.com/case_styles/CD542.pdf