SAW component having an improved temperature coefficient

An apparatus comprising:

• a piezoelectric substrate comprising at least one transducer electrode structure comprising:
• a metallization formed by one or more metals, the one or more metals having a mean specific density that is at least 50% higher than that of aluminum;
• a compensation layer applied fully or partially over the metallization, the compensation layer being of a material having a temperature dependence of elastic constants that substantially counteracts a temperature coefficient of frequency of the substrate, the compensation layer having a thickness that is less than 15% of an acoustic wavelength of a wave capable of propagation in the structure;
• and
• a passivation layer that is thinner than the compensation layer, the passivation layer being beneath the compensation layer.