This part is a kind of semiconductor called B7766.

Function of this product has SAW Components.

Manufacturers : EPCOS

Image and pinout :

Some of the text within the PDF file :

SAW Components Data Sheet B7766 SAW Components Low-Loss Filter Data Sheet B7766 2441,75 MHz Chip Sized Saw Package DCS6K Features q q q q q 0,1 4 5 6 0,1 bottom view Low-loss RF filter for bluetooth Usable passband 83,5 MHz Unbalanced to balanced operation Impedance transformation Package for Surface Mounted Technology (SMT) 0,5 3 2 1 0,5 side view Terminals q Ni, gold-plated 2,5 2,0 0,68 top view Dimensions in mm, approx. weight 0,010g Pin configuration 2 1, 3 4, 6 5 Input, unbalanced Input ground Output, balanced To be grounded Type B7766 Ordering code B39242-B7766-C911 Marking and Package according to C61157-A7-A123 Packing according to F61074-V8153-Z000 Electrostatic Sensitive Device (ESD) Maximum ratings Operable temperature range Storage tem [ ... ]

B7766 PDF Datasheet Download