 |  | HC-49/U, HC-49/T, HC-49/T3 CRYSTAL UNITS |  |
| Features: | High reliability by means of resistance weld hermetic seal.
Excellent aging characteristics. |
| Type | HC-49/U, HC-49/T, HC-49/T3 | | Frequency range | Fundamental
3rd
5th | 1.800~48.0MHz
26.000~90.0MHz
80.000~176.0MHz | | Vibration mode | AT cut, Fundamental, 3rd, 5th | | Frequency tolerance(at 25oC) | - /+10PPM~ | | Equivalent series resistance | See table No.1 | | Stability(-10~+60oC) | - /+5PPM~ | | Shunt capacitance | 7.0 max. | | Load capacitance | Series resonance, 16pF, 20pF, 30pF | | Insulation resistance | 500 M ohms //DC 100V | | Shock | Natural drop from 75cm height onto a hard wooden
board, three times dF/F=±3ppm max. | | Vibration | The 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 | | Leak | 5*10^-8 atm.cc/sec max. | | Aging | - / +2ppm / year, - / +5ppm / year |
Equivalent series resistance(ESR) Table No. 1 | Frequency | Mode | ESR | | 1.8432 MHz | Fundamental | 500 ohms max. | | 2.0~2.9 MHz | Fundamental | 350 ohms max. | | 3.0~3.1 MHz | Fundamental | 200 ohms max. | | 3.2~3.9 MHz | Fundamental | 150 ohms max. | | 4.0~4.4MHz | Fundamental | 100 ohms max. | | 4.5~4.9 MHz | Fundamental | 80 ohms max. | | 5.0~6.9 MHz | Fundamental | 50 ohms max. | | 7.0~9.9 MHz | Fundamental | 35 ohms max. | | 10.0~48.0 MHz | Fundamental | 25 ohms max. | | 26.0~90.0MHz | 3rd | 70 ohms max. | | 80.0~150.0 MHz | 5th | 120 ohms max. |
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