Techniques for Selective Soldering High Thermal Mass and Fine-Pitch Components

Published:

August 8, 2022

Author:

Reid Henry

Abstract:

Selective soldering has evolved to become a standard production process within the electronics assembly industry, and now accommodates a wide variety of through-hole component formats in numerous applications. Most through-hole components can be easily soldered with the selective soldering process without difficulty however some types of challenging components require additional attention to ensure that optimum quality is maintained. Several high thermal mass components can place demands on the selective soldering process, while the use of specialized solder fixtures, or solder pallets, often places additional thermal demand on the preheating process. Fine-pitch through-hole components and connectors place a different set of demands on the selective soldering process and typically require special attention to lead projection and traverse speed to minimize bridging between adjacent pins. Dual in-line memory module (DIMM) connectors, compact peripheral component interface (cPCI) connectors, coax connectors and other high thermal mass components as well as fine-pitch microconnectors, can present challenges when soldered into backplanes or multilayer printed circuit board assemblies. Adding to this challenge, compact peripheral component interface connectors can present additional solderability issues because of their beryllium copper base metal pins. Key Terms: Selective soldering, drop-jet fluxing, sustained preheating, flux migration, adjacent clearance, lead-to-hole aspect ratio, lead projection, thermal reliefs, gold embrittlement, solderability testing....

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Company Information:

Hentec Industries, Inc. designs and manufacturers high quality precision machines for use in selective soldering, lead tinning, and solderability testing applications.

Newman Lake, Washington, USA

Consultant / Service Provider, Manufacturer

  • Phone 509.891.1680
  • Fax 509.891.1681

See Company Website »

Company Postings:

(9) products in the catalog

(1) technical library article

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