A surface acoustic wave device including a LiTaO.sub.3 substrate, and an interdigital transducer is provided on the LiTaO.sub.3 substrate. The interdigital transducer includes as a major component at least one of Au, Ag, Ta, Mo, Cu, Ni, Cr, Zn, and W, and the interdigital transducer has a normalized film thickness H/.lambda. of approximately 0.05 or less so as to excite a shear horizontal wave.

Un dispositif extérieur d'onde acoustique comprenant un substrat LiTaO.sub.3, et un capteur interdigital est fourni sur le substrat LiTaO.sub.3. Le capteur interdigital inclut comme composant important au moins un d'Au, d'AG, de Ta, de MOIS, de Cu, de Ni, de Cr, de Zn, et de W, et le capteur interdigital a une épaisseur de film normale H/.lambda. approximativement de 0.05 ou de moins afin d'exciter une vague horizontale de cisaillement.

 
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