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HC-49/US, HC-49/USMD CRYSTAL UNITS
Features:Small size , Light weight
High dependability by means of resistance weld hermetic seal.
Tape and reel available
Height 2.5mm available

TypeHC-49/US, HC-49/USMD
Frequency rangeFundamental
3.5~90.0MHz
Vibration modeAT cut, Fundamental, O3
Frequency tolerance(at 25oC)- /+20PPM~
Equivalent series resistanceSee table No.1
Stability(-10~+60oC)- /+20PPM~
Shunt capacitance5.0 max.
Load capacitanceSeries resonance, 16pF, 20pF, 30pF
Insulation resistance500 M ohms //DC 100V
ShockNatural drop from 75cm height onto a hard wooden
board, three times dF/F=±5ppm max.
VibrationThe crystal units shall be capable of with standing each one hour in 3 directions 10-55Hz amplitude 1.5mm Fs=±3.0ppm max.
ESR:- /+2.0 ohms or 15% whichever is larger
Leak5*10^-8 atm.cc/sec max.
Aging- / +5ppm / year

Equivalent series resistance(ESR) Table No. 1
FrequencyModeESR
3.5~3.9MHzFundamental150 ohms max.
4.0~4.9 MHzFundamental130 ohms max.
5.0~5.9 MHzFundamental120 ohms max.
6.0~7.9 MHzFundamental100 ohms max.
8.0~8.9 MHzFundamental80 ohms max.
10.0~14.9 MHzFundamental60 ohms max.
15.0~48.0 MHzFundamental40 ohms max.
36.0~90.0 MHzO370 ohms max.