Surface acoustic wave device

A surface acoustic wave device comprising:

• a single crystal piezo-electric substrate;
• and
• an interdigital transducer formed of a material mainly containing aluminum and disposed on a surface of said piezo-electric substrate,
• wherein said single crystal piezo-electric substrate contains an additive, and has an orientation rotated by an angle in a range of 42° to 48° from a Y-axis to a Z-axis about an X-axis,
• said piezo-electric substrate is a lithium tantalate substrate or a lithium niobate substrate, and
• said additive comprising iron, added at a weight percentage of 1.24 wt. % or less,
• said interdigital transducer presents a normalized thickness h/λ in a range of 7 to 11 %, said normalized thickness being derived by normalizing a thickness h of said interdigital transducer with a spacing λ between digits of said interdigital transducer.