Patent ID: 6674156
Filing Date: 2004-01-06
Classification: H01L

Abstract:
A leadless leadframe panel that has a bottom surface and an opposing top surface, a distance between the bottom surface and the top surface being a thickness of said panel, said panel also having multiple rows of contact pads, comprising:a first set of tie bars; a first set of contact pads, wherein each contact pad of said first set is connected to a respective one of the tie bars of said first set of tie bars, said contact pads of said first set having a contact surface that is coplanar with the bottom surface of said panel, a first maximum thickness of each of said first set of contact pads being equal to the thickness of said panel, wherein the first maximum thickness is attained where each tie bar of the first set of tie bars is connected to each contact pad of the first set of contact pads; a second set of tie bars, the tie bars of said first and second set being in parallel formation and the tie bars of said first and second set being formed in an alternating formation, each of said second set of tie bars has a thickness that is less than the thickness of said panel, said first and second set of tie bars being aligned with the top surface of said panel; and a second set of contact pads, wherein each contact pad of said second set is connected to a respective one of the tie bars of said second set of tie bars, the contact surfaces of said second set of contact pads being in the same plane as the bottom surface of said panel, and a second maximum thickness of each of said second set of contact pads being equal to the thickness of said panel, wherein the second maximum thickness is attained where each tie bar of the second set of tie bars is connected to each contact pad of the second set of contact pads.