A method includes forming a redistribution structure over a carrier, the redistribution structure having conductive features on a surface of the redistribution structure distal the carrier; forming a conductive pillar over the surface of the redistribution structure; attaching a die to the surface of the redistribution structure adjacent to the conductive pillar, where die connectors of the die are electrically coupled to the conductive features of the redistribution structure; and attaching a pre-made substrate to the conductive pillar through a conductive joint, where the conductive joint is on the conductive pillar and comprises a different material from the conductive pillar, where the conductive joint and the conductive pillar electrically couple the redistribution structure to the pre-made substrate.