Disclosed is an acoustic surface wave device having reduced temperature coefficient of propagation delay within a desired range of operating temperatures. In one embodiment the device includes a piezoelectric substrate comprising X-propagating Y-cut quartz having a cut angle at which point of zero temperature coefficient of propagation delay is at a temperature which is higher than the desired range of operating temperatures. There is included on the substrate in the desired path of the propagating surface wave a deposit of conductive material which has the effect of lowering the temperature at which the point of zero temperature coefficient of propagation delay occurs, thereby reducing the magnitude of the temperature coefficient of propagation delay within the desired range of operating temperatures.