HC49 series

      The HC49 crystals are designed as a long-established industry-standard part.Some basic specification about HC49 crystals that they would be available to provide the lowest cost crystal.But these crystals can also be manufactured to very close tolerances and low ESR values. HC49's holder variants are HC49/T (truncated),which provide a lower height version, 3-wire versions where the crystal base and body can be earthed by a centre earth wire and HC50 which has larger diameter leads specifically for socket mounting.
      This  HC49  series has six features.The first one is that it would be a very low cost crystal.The second one is that it would be available with close tolerances.The third one is that it would have fully customisable specification.The fourth one is that it would be comprehensive euroquartz stockholding.The fifth one is that it would be sealed in industry-standard package with options.The last one is that it would have a very wide frequency range.
      Some important specifications of  HC49  have been concluded into several points as follows.The first one is about its frequency range which would have the minimum of 1.0MHz and the maximum of 250.0MHz.That would be wide from 1.0MHz to 250.0MHz.The second one is about its calibration tolerance at 25ºC which would be from ±3ppm to ±50ppm.The third one is about its frequency stability over temp which would be from ±3ppm to ±100ppm.The fourth one is about its load capacitance which would be from 8pF to 50pF, or series.The fifth one is about its ageing which would be ±3ppm of max in the 1st year and ±1ppm of max per year after.The sixth one is about its drive level which would be 1mW of max.The seventh one is about its static capacitance (C0) which would be 7pF of max.The last one is about its hlder which would be resistance-weld and hermetic seal.That are all the important specifications.