THERMAL MANAGEMENT OF HEAT-SENSITIVE COMPONENTS IN THE REFLOW AND REWORK PROCESSESAuthor: Rahul Raut et al.
Company: SUNY Binghamton
Date Published: 2/25/2005 Conference: Pan Pacific Symposium
This is further complicated by factors like PCB thickness, and the existence of hybrid "Pb-free" components that still contain Sn63Pb37 solders. In lead-free rework, components are subjected to multiple thermal cycles. Those components adjacent to the rework site regularly see temperatures that are high enough to compromise the integrity of their solder joints. In this paper, we discuss efforts made to solve these issues using an innovative thermal management approach.
In this thermal-management system, cooling caps are used for an efficient reflow and rework process. Performance of different cooling cap designs is discussed in the paper, along with procedures for use, and results on a range of test boards. Optimization for different cooling considerations has been achieved through empirical measurements, together with 2D and 3D models, using ANSYS. This technology can facilitate the assembly of legacy and other heat-sensitive components in lead-free reflow and rework. It can also aid in increasing the throughput of the overall manufacturing process.
Key words: Lead-free Assembly, heat-sensitive components, reflow and rework issues, thermal management, cooling caps / devices.
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