Patent ID: 7578425

Claim:
A method for wirebonding leads of a plurality of lead frames being part of a lead frame assembly by a wirebonding tool to semiconductor products mounted on the respective lead frames, the lead frame assembly being indexable in an index direction relative to a wirebonding frame, and comprising a first row of lead frames and a second row of lead frames that is adjacent and parallel to the first row as seen in the index direction, the lead frames being spaced from each other at a lead frame pitch in the index direction, the method comprising the steps of: (a) clamping the leads of n adjacent lead frames of the first row by a first clamp, and wirebonding the leads of the n lead frames of the first row to the corresponding semiconductor products; (b) clamping the leads of n adjacent lead frames of the second row by a second clamp, and wirebonding the leads of the n lead frames of the second row to the corresponding semiconductor products; (c) releasing the first clamp after step (a); (d) indexing the lead frame assembly over n lead frame pitches relative to the wirebonding frame after step (a), the second clamp and the wirebonding tool following the index movement; (e) releasing the second clamp after step (b); (f) moving the second clamp opposite to the indexing direction over n lead frame pitches; and (g) repeating steps (a)-(f).