Patent ID: 6429050
Filing Date: 2002-08-06
Classification: H01L

Abstract:
A method of forming lead frame leads, comprising the steps of:coating two sides of a lead frame material with a photo resist material; patterning the photo resist material on a first side of said lead material with a pattern to produce lead frames; patterning the photo resist material on a second side of said lead material with a pattern to produce lead frames, said second lead frame pattern offset from the pattern on said first side; etching the lead frame material through said patterns on said first and second sides of said lead frame material to define a lead frame leads on each side of said lead frame material, such that lead frame leads on said first side are offset from lead frame leads on said second side by a vertical clearance; wherein adjacent lead frame leads common to said first side of said lead frame material are offset from each other by a horizontal clearance, and adjacent lead frame leads common to said second side of said lead frame material are offset from each other by a horizontal clearance, and further wherein each lead frame lead common to said first side of said lead frame material has a substantially zero horizontal clearance between itself and proximal lead frame leads that are common to said second side of said lead frame material such that said vertical clearance solely prevents shorting between each lead frame lead common to said first side of said lead frame material and each proximal lead frame lead that is common to said second side of said lead frame material.