HC49/U-LF Low Frequency Crystals HC49/U-LF Low Frequency Crystals Packaged in a standard HC49U formatĀ this range of low frequency crystals offers frequencies from 300kHz Any KHz Range Any Make an enquiry download data sheet Packaged in a standard HC49U formatĀ this range of low frequency crystals offers frequencies from 300kHz Features Standard HC49U package SL and DT cut crystals Low frequency range from 300kHz Typical Applications Specifications