This part is a kind of semiconductor called MA7812x.
Function of this product has MA/MB Series - High Frequency Ceramic Capacitors.
Manufacturers : Murata
Image and pinout :
Some of the text within the PDF file :
APPLICATION SPECIFIC CAPACITORS HIGH FREQUENCY CERAMIC CAPACITORS MA/MB Series OUTSTANDING CHARACTERISTICS I Miniature size I Very high Q at high frequencies I High RF power capabilities I Impervious to environmental conditions I Low dissipation factors I Excellent retrace capability (not applicable for X7R styles) I High temperature stability I Low noise I Meets Mil-55681 with respect to: Shock, Vibration, Moisture Resistance, Solderability, Barometric Pressure, Temperature Cycling, Immersion and Salt Spray ADDITIONAL FEATURES I Packaging options I Lot processing data available MA SERIES For filtering, coupling and impedance matching in most RF circuits, the MA Series chips and leaded devices offer outstanding performance and reliability with the greatest range of values and configurat [ ... ]