HC49/4H & HC49/3H CRYSTALS
Outline in mm (inches) - HC49/4H & HC49/4H-3L
ISSUE 8; 12 JUNE 1998
Delivery Options
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Common frequencies are available from stock. Please
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see p4 for details
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Holder Style
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HC49/4H & HC49/3H crystals are resistance welded,
hermetically sealed in an inert atmosphere with glass
to metal seals securing the lead wires.
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Holders suffixed ‘–3L have a centre third wire which
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General Specifications
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Load Capacitance (CL): 10pF to 75pF or Series
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Drive Level: 500mW max.
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Static Capacitance (C0): 7pF max.
Typical Frequency vs Temperature Curves
for various angles of AT-cut crystals
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Ageing: 3ppm typical per year
Standard Frequency Tolerances and Stabilities
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10ppm, 20ppm, 30ppm, 50ppm, 100ppm
Operating Temperature Ranges
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0 to 50°C
–10 to 60°C
–20 to 70°C
–30 to 80°C
–40 to 90°C
–55 to 105°C
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Storage Temperature Range
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–55 to 125°C
Environmental Specification
Shock: 981m/s2 for 6ms, three shocks in each direc-
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tion along three mutually perpendicular planes
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Vibration: 10 to 60Hz 0.75mm displacement, 60 to
500Hz 98.1m/s2 acceleration, 30 minutes in each of
three mutually perpendicular planes
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Typical Frequency vs Temperature Curves
for various angles of BT-cut crystals
Marking
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Frequency only
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Outline in mm (inches) - HC49/3H & HC49/3H-3L
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Europe Tel: +44 (0)1460 74433 Fax: +44 (0)1460 72578
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