A method of making an inkjet printhead

A method of making an inkjet printhead for surface mounting comprises providing a substrate (10) having a plurality of ink ejection elements and a plurality of electrical contacts (18) formed on a first surface, the contacts being connected to the ink ejection elements to allow selective energisation of the elements. A plurality of through-holes (26) are formed in the substrate each extending from the opposite surface of the substrate fully through the thickness of the substrate to meet the underside of a respective electrical contact (18) on the first surface. Each through-hole is substantially completely filled with a conductive material (36) by electroplating. Finally, a further plurality of electrical contacts (solder mounds) (38) are provided on the second surface of the substrate each in contact with the conductive material in a respective through-hole.