A multilayer process for the connection of fine‐pitch‐devices on molded interconnect devices (MIDs)
Abstract
Purpose
The purpose of this paper is to present a new multilayer process for three‐dimensional molded interconnect devices (3D‐MIDs) that allows the assembly of modern area array packaged semiconductors.
Design/methodology/approach
A new 3D‐MID multilayer process based on local overmolding is developed. To investigate this new process, a 3D demonstrator is designed, simulated and fabricated. Various technologies such as injection molding, maskless laser assisted electroless metallization, overmolding and laser via drilling are used.
Findings
Using the new 3D‐MID multilayer process a 3D demonstrator with three metallization layers is fabricated. Injection molding simulation is utilized to ensure a feasible demonstrator design. It is shown that a surface laser treatment improves layer‐to‐layer adhesion during the process. Shear and pull tests prove the adhesion promotion. The 3D fine‐pitch‐metallization is done down to 60 μm track width. Via resistance is measured by four terminal sensing in agreement with previous results. Design rules for process compatible vias are introduced. The fabricated demonstrator is suitable for flip‐chip‐based area array packaged semiconductors.
Research limitations/implications
A proof of concept is given by the fabricated demonstrator. Further, work should include reliability tests of the multilayer structures and improvement of individual process steps.
Originality/value
The paper describes a new multilayer process for 3D‐MIDs. It overcomes existing restrictions regarding the electrical routing on 3D‐MID surfaces. The compatibility of area array packaged semiconductors with a high‐inputs/outputs count and the 3D‐MID technology is improved.
Keywords
Citation
Leneke, T., Hirsch, S. and Schmidt, B. (2009), "A multilayer process for the connection of fine‐pitch‐devices on molded interconnect devices (MIDs)", Circuit World, Vol. 35 No. 2, pp. 23-29. https://doi.org/10.1108/03056120910953286
Publisher
:Emerald Group Publishing Limited
Copyright © 2009, Emerald Group Publishing Limited