Download the CFUM455F datasheet PDF.
This datasheet also includes the CFUM455B variant, as both parts are published together in a single manufacturer document.
FILTERS FOR COMMUNICATIONS EQUIPMENT RESIN MOLDED –HIGHLY SELECTIVE CFUM/CFWM 450/455kHz SERIES
The CFUM and CFWM lines of ceramic filters are miniaturized versions of the CFU/CFWS lines.