A surface mount connector for high speed data transfer application has an insulative housing with a vertically-oriented circuit card-receiving slot disposed along a front face thereof. A plurality of conductive terminals are supported by the housing so that contact portions of the terminals extend into the card slot. The terminals are formed with a thin configuration to reduce the overall capacitance of the terminals as a group as a means of regulating the impedance thereof. The terminals are supported on opposing sidewalls of the connector housing and each of the terminals includes a tail portion, a contact portion and a retention portion that engages the connector housing so that the contact portions are cantilevered in their extent within the housing.