This part is a kind of semiconductor called B7761.

Function of this product has SAW Components.

Manufacturers : EPCOS

Image and pinout :

Some of the text within the PDF file :

SAW Components Data Sheet B7761 SAW Components Low-Loss Filter for Mobile Communication Data Sheet Features s Low-loss RF filter for mobile telephone B7761 836,5 MHz Chip sized SAW package DCS6P GSM 850 systems, transmit path Low amplitude ripple Usable passband 25 MHz Balanced to unbalanced operation Impedance transformation from 100 Ω to 50 Ω s Suitable for GPRS class 1 to 12 s Ceramic package for Surface Mounted Technology (SMT) s s s s Terminals s Ni, gold-plated Dimensions in mm, approx. weight 0,010 g Pin configuration 4 6 2 1,3,5 Balanced input Balanced input Output Ground, to be grounded Type B7761 Ordering code B39841-B7761-E410 Marking and Package according to C61157-A7-A101 Packing according to F61074-V8153-Z000 Electrostatic Sensitive Device ( [ ... ]

B7761 PDF Datasheet Download