euro quartz 49usmx crystals description 49usmx crystals are low profile surface mount crystals that have the same footprint as standard hc49 or hc49-4h crystals. 49usmd crystals are ideal for use in low cost, mass-market applications. the crystal may also be specified with close tolerances when required. outline & dimensions euroquartz limited blacknell lane crewkerne somerset uk ta18 7he tel: +44(0)1460 230000 fax: +44(0)1460 230001 email: sales@euroquartz.co.uk www.euroquartz.co.uk 49smd standard and low profile frequency range: 3.2mhz to 70mhz calibration tolerance: 30ppm at 25c standard 10ppm available frequency stability over temp. at-cut: 30ppm over -10 ~ +60* bt-cut: 100ppm over -10 ~ +60c* operating temperature range: -10 ~ +60c to -40 ~ +85c shunt capacitance (c0): 4pf typical, 7pf maximum load capacitance (cl): series or from 8pf to 32pf () ageing: 3ppm maximum in first year 1ppm per year thereafter (ta = 25c, drive 100 w) drive level: 100 w typical, 500 w maximum reflow soldering: 260c, 10s maximum holder: hermetic seal, resistance weld packaging: eia 24mm tape and reel 1000 pieces per reel rohs status: compliant * customer specified closer tolerances may be specified specification ? low cost crystal for mass market applications surface mount version of hc49-4h crystal comprehensive stockholding of standard frequencies customized parts readily available industry-standard package low-profile versions available features frequency range (mhz) crystal cut & oscillation mode 3.2~3.4 at fund. 300 3.5~4.0 at fund. 150 4.1~4.9 at fund. 120 5.0~5.9 at fund. 100 6.0~8.9 at fund. 80 9.0~9.9 at fund. 60 10.0~12.9 at fund. 50 13.0~24.0 at fund. 45 24.1~30.0 at fund. 40 24.0~48.0 bt fund. 40 27.0~30.0 at 3rd ot 150 30.0~50.0 at 3rd ot 100 50.1~70.0 at 3rd ot 80 max. esr (ohms) part numbering 49usmx part numbers are derived as follows: example: 16.000mhz 49usmx/30/50/-20+70/30pf/atf nominal frequency holder style & height 49usmx = 4.2mm 49usmxl = 3.2mm 49usmx25 = 2.5mm calibration tolerance at 25c ppm temperature stability (over operating temperature range) ppm operating temperature range c, lower and upper figure (may also be shown as lower figure only) circuit condition sr = series resonant or 8pf to 32pf operating mode atf = at-cut, fundamental btf = bt-cut fundamental at3 = at-cut 3rd overtone * if required the maximum esr may be specified, in which case use the suffix ?/r40? where for instance a maximum esr of 40 is required. esr & oscillation mode
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