High count lead frame for computer

Customer Requirement:
A major computer manufacturer asked PRECISION MICRO to design and manufacture a high count lead frame with a leg width at the chip end of less than half of the material thickness (250 µm) to a tolerance of ± 12µm. Die attach land was to be down-set and spot plated with silver.

Material:
Alloy 42, spot silver plated.

Solution:

• PRECISION MICRO achieved the profile to the required tolerances through highly accurate Photo Etching
• After extensive trials PRECISION MICRO developed an accurate down-set tooling machine capable of die cutting and applying the Kapton tape accurately along with the necessary plating masks to silver spot plate the central area.

Advantage

• Entire project from design to completion was carried out by PRECISION MICRO and customer had a single source of supply.
• Cost benefits accrued from carrying out downsetting and mask application on a single machine.
• Design was ‘right first time’ as designers had intimate knowledge of the all the manufacturing processes and tolerances involved.