Indium Corporation Announces New High-Reliability, Low-Temperature Alloy

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Indium Corporation has released a new, bismuth-based low-temperature alloy developed for low-temperature reflow processes which require enhanced thermal cycling reliability.

Indalloy303, also known as Bi+, is an innovative alloy that retains the low reflow temperatures required for temperature-sensitive processes while enhancing the lifetime reliability of the solder joint beyond that of traditional low-temperature solders.

As a low-temperature, Pb-free solution, Indalloy 303 offers:

  • A reflow temperature as low as 170℃
  • Excellent thermal cycling performance
  • Resistance to hot tearing
  • Compatibility with SAC in hybrid BGA joints
  • Low voiding

Indalloy303’s flux vehicle, Indium5.7LT-1, is an air-reflow, halogen-free, no-clean solder paste designed for assembly processes using Bi-based and In-containing low-temperature alloys. It delivers:

  • Superior print transfer efficiency
  • Clear post-reflow flux residue
  • Solder bead and solder ball minimization
  • Exceptional wetting on OSP, Immersion Ag, Immersion Sn, and ENIG
  • Excellent coalescence of small deposits
  • Outstanding SIR performance under challenging low-temperature reflow conditions


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