Issue link: https://iconnect007.uberflip.com/i/1541670
46 SMT007 MAGAZINE I DECEMBER 2025 ARTICLE by D a n i e l e P e r i c o , M a c D e r m i d A l p h a E l e c t ro n i c s S o l u t i o n s Rethinking Soldering for Energy-efficient PCB Design As automotive OEMs intensify their commit- ments to carbon neutrality, ranging from Stellantis' 20381 net-zero target to BYD's full value chain neutrality by 2045², they are also embracing circularity through material reuse, recycling, and closed-loop systems. This aligns with the sustainability challenges faced in electronics manufacturing, where energy-intensive processes contribute signifi- cantly to industrial CO₂ emissions. By integrat- ing advanced materials and process innova- tions, both sectors are converging on a shared goal: reducing carbon footprints while enhanc- ing reliability and operational efficiency. One such innovation is the adoption of low tempera- ture soldering (LTS) alloys in component assem- bly, which reduces energy consumption and improves sustainability. Engineers originally developed LTS to protect heat-sensitive components, and today it offers an effective way to reduce energy consumption dur- ing soldering. This technology ensures high pro- cess reliability and flexibility, while reducing equip- ment, labor, and maintenance costs. These support the OEMs' drive to carbon emission neutrality and recycling initiatives such as the Volkswagen³ and Stellantis⁴ circular material programs. In this article, we examine the characteristics of zero-halogen, low-temperature flux chemistries with lead-free LTS alloys that connect material per- formance with sustainable circuit board design. History and Development of LTS Technology Following the transition to "lead-free" processes that have been imposed by regulations, the elec-