MMD Components (Monitor +ACY- Quartztek) has produced what they                               claim is the smallest quartz crystal available in production                               quantities.  Measuring only 2 x 2.5 mm, with a 0.57-mm profile, the                               X series surface-mountable crystals can be used in any application                               where space is limited and a frequency reference is required. They                               are available for frequencies from 16 to 60 MHz with frequency                               tolerance/stability rate as high as +ALE-50 PPM/+ALE-100 PPM. The                               units are fully RoHS compliant and compatible with lead-free reflow                               profiles. They are supplied in a hermetic four-pad ceramic package                               and delivered on tape-and-reel packaging for use with automated                               assembly equipment.                               MMD Components (Monitor +ACY- Quartztek) (