This part is a kind of semiconductor called C4505.

Function of this product has OCXO.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

C4505 Typical Applications Base Stations Test Equipment Synthesizers Digital Switching OCXO Features Surface Mount Package Reflow Process Compatible AT-Cut and SC-Cut Crystal Options Compact Package OCO700 Previous Vectron Model Numbers Frequency range Standard frequencies 6 MHz – 60 MHz 8.192; 10; 12, 12.8; 16.384;20; 32.768; 38.88, 61.44MHz Frequency stabilities1 [AT Cut Crystal – Standard] Parameter vs. operating temperature range (Referenced to +25°C) Parameter Initial tolerance vs. supply voltage change vs. load change vs. aging / day vs. aging / year Warm-up Time Min -50 -100 -100 Min -500 -10 -10 -5.0 -250 Typ Max. +50 +100 +100 Max. +500 +10 +10 +5.0 +250 3 Units ppb ppb ppb Units ppb ppb ppb ppb ppb minutes Operating temp range Ordering Code -20 … +70°C D508 -20 … + [ ... ]

C4505 PDF Datasheet Download