HC51 SERIES

      HC51 crystals are  historic standard crystals in the industry. Basic specification HC51 crystals provide low frequencies at relatively low cost and have the advantage of low ESR values. A holder variant is the HC48 which has larger diameter leads specifically for socket mounting.
      HC51 series crystals have five features:(1)Both low frequencies and low ESR values.(2)Close tolerances available.(3)Fully customisable specification.(4)Industry-standard package with options.(5)frequency range is widely.
      General specification of HC51 series crystals are as follows:(1)Frequency Range:100kHz to 70MHz.(2)Calibration Tolerance at 25ºC: from ±10ppm to ±100ppm.(3)Frequency stability over temp: from ±10ppm to ±100ppm.(4)Load Capacitance: 8pF to 50pF, or Series.(5)Ageing: ±3ppm max 1st year,±1ppm max per year after.(6)Drive level: 1mW max.(7)Static capacitance (C0): 9pF max.(8)Holder: Resistance-weld, hermetic seal.
      HC51 crystal part numbers are derived as follows:for example:1.000MHz HC51/50/100/10/30pF/ATF, "1.000MHz" means frequency,"HC51" means Holder (HC51 or HC48),"50" means Calibration Tolerance (±ppm),"100" means Temperature Stability (±ppm),"10" means Temperature Range (±ppm),"30pF" means Circuit Condition and "ATF" means Crystal Cut and Mode.