This study examines the changes in strain rate dependence and the deformation behavior of near-eutectic Sn-Bi alloys as a function of Sb concentration using nanoindentation. Alloying near-eutectic Sn-Bi solder with Sb has been shown to increase the strain to failure under tensile and shear conditions in solder ball geometries, with Sb additions remaining in solid solution up to 0.5 wt.