C4NP - DATA FOR FINE PITCH TO CSP FLIP CHIP SOLDER BUMPINGAuthors: Eric Laine, Klaus Ruhmer, Luc Belanger, Michel Tur
Company: SUSS MicroTec, Inc. and IBM
Date Published: 11/1/2006 Conference: IWLPC (Wafer-Level Packaging)
C4NP is a novel solder bumping technology developed by IBM and commercialized by Suss MicroTec. C4NP addresses the limitations of existing bumping technologies by enabling low-cost, fine pitch bumping using a variety of lead-free solder alloys. C4NP is a solder transfer technology where molten solder is injected into pre-fabricated and reusable glass templates (molds). The filled mold is inspected prior to solder transfer to the wafer to ensure high final yields. Filled mold and wafer are brought into close proximity/soft contact and solder bumps are transferred onto the entire 300mm (or smaller) wafer in a single process step without the complexities associated with liquid flux. C4NP technology is capable of fine pitch bumping while offering the same alloy selection flexibility as solder paste printing. The simplicity of the C4NP process makes it a low cost, high yield and fast cycle time solution for both, fine-pitch FCiP as well as WLCSP bumping applications.
This paper provides a summary of the most recent manufacturing and reliability results of C4NP bumped, 300mm wafer, high-end logic device packaging. This includes reliability data for C4NP lead free solder bumped devices attached to organic chip carriers. Mold fill data for CSP type dimensions is also included. Relevant process equipment technology and the novel requirements to run a HVM (high volume manufacturing) C4NP process are reviewed. The paper also summarizes the C4NP manufacturing cost model and elaborates on the cost comparison to alternative bumping techniques. The data in this paper is provided by IBM’s packaging operations at the Hudson Valley Research Park in East Fishkill, NY and Bromont, Quebec.
Key Words: Flip chip, wafer bumping, lead free, CSP
Members download articles for free:
Not a member yet?
What else do you get when you join SMTA? Read about all of the benefits that go along with membership.
Notice: Sharing of articles is restricted to just your immediate work group. Downloaded papers should not be stored on an external network or shared on the internet.