Connector with heat sink

A cable end connector, comprising:

• a case having
• an inner surface,
• an upper shell, and
• a lower shell secured with the upper shell;
• a circuit board mounted in the case and extending toward an inserting direction;
• at least a portion of the circuit board emerging from a front part of the case;
• the circuit board having
• a heating source;
• a thermal diffusing unit thermally coupled with the inner surface of the case and the heating source of the circuit board;
• a heat transfer coefficient of the thermal diffusing unit being larger than a heat transfer coefficient of the case, whole of the thermal diffusing unit being disposed within the case and being not exposed via the upper shell of the case;
• and
• a first heat sink thermally coupled with the thermal diffusing unit and connected with the case;
• a heat transfer coefficient of the first heat sink being larger than the heat transfer coefficient of the case;
• the first heat sink having
• a base board having
• a first surface thermally coupled with the thermal diffusing unit;
• and
• a second surface being opposite to the first surface;
• multiple first cooling fins formed on the second surface of the base board and extending toward a direction away from the base board;
• the first cooling fins spaced apart from each other and being parallel to each other;
• and
• multiple first cooling wind passages respectively formed between the first cooling fins;
• each of the first cooling wind passages formed between two adjacent ones of the first cooling fins.