X42 CRYSTALS

      The X42 crystals(4mm x 2.5mm x 0.6mm SMD, 12.0MHz to 50MHz) are a kind of micro-miniature surface-mount mount crystals with a gold plated ceramic base and a seam welded metal lid that providing a stable crystal with very low ageing. The rugged construction ensures that this crystal has high shock and vibration resistance while the crystal has been specifically designed for use in small hand-held communication equipment such as PDAs, GPS and Bluetooth.
      The characteristices of X42 crystals are listed, miniature size(4.0mm x 2.5mm x 0.6mm height), gold-plated ceramic base with metal seam-welded package, very low ageing, designed for hand-held equipment, PDAs, Blue Tooth, GPS, and high shock and vibration resistance.
      Some parameters of X42 crystals are given frequency range AT-Cut fundamental(12.0MHz to 50.0MHz), calibration tolerance at 25ºC(Tighter stability, tolerance and lower ESR values are available)(from ±5ppm (±10, ±20 or ±30ppm standard)), frequency stability(Tighter stability, tolerance and lower ESR values are available)(-10°to +60°C from ±5ppm, -20° to +70°C from ±10ppm, -30°to +85°C from ±10ppm), storage temperature(-40°~+85°C), equivalent series resistance(See table), shunt capacitance (C0)(2pF to 4pF typical, 5pF maximum), load capacitance (CL)(Series or from 10pF to 32pF (Customer specified CL)), reflow soldering(10s maximum at 260°C twice or 180s at 230°C, once), packaging(16mm EIA tape and reel), a(<±3ppm per year at +25°C).
      The part number can sign in this way such as 12.000MHz(Nominal Frequency)X42(Package)/20(Calibration tolerance at 25°C (±ppm))/30(Temperature Stability over temp. range (±ppm))/-10+60(Operating Temp. Range (°C) (Lower and upper limits))/12pF(Load Capacitance(Either SR for series or CL in pF))/60R(Equivalent Series Resistance(When special value is required)).