Solder Sphere Diameter and Spheroid Tolerance

In the arti­cle “How is a high qual­i­ty sol­der sphere made?”, we high­light­ed that one of the char­ac­ter­is­tics of high qual­i­ty sol­der spheres are that they have uni­form diam­e­ters and tight diam­e­ter tol­er­ances and tight spher­oid tol­er­ances. In this arti­cle, we will explain why it is impor­tant to have such a tight sol­der ball diam­e­ter and spher­oid tolerance.

Solder Ball Diameter & Spheroid Tolerance

The small­er the sol­der spheres, the more impor­tant it is to get the tol­er­ance of both the diam­e­ter and spheric­i­ty (mea­sure of how round or spher­i­cal the ball is) under control.

Sol­der Sphere Selec­tor Guide
Diam­e­ter Diam­e­ter Tolerance Spher­oid Tolerance Remarks
Top of Page
How to Man­u­fac­ture Qual­i­ty Sol­der Spheres
Con­trol and Mea­sure Sol­der Ball Diam­e­ter and Spher­oid Tolerance
0.075mm — 0.15mm
(3–6 mil)
±0.005 mm
(±0.2 mil)
1.5% Tru­ly Tight Tol­er­ances: We take one lot of sol­der spheres and divides it into 4 small­er lots. Each lot is then checked with advanced visu­al inspec­tion sys­tems. If even 1 ball is out of spec, the entire batch is scrapped and reworked!
0.20mm — 0.6mm
(8–24 mil)
±0.010 mm
(±0.4 mil)
0.65mm — 0.76mm
(25–30 mil)
±0.015 mm
(±0.6 mil)

CAPLINQ sup­plies a range of sol­der spheres includ­ing Tin/Lead (Sn63Pb37) Sol­der Spheres or our Lead­free (Pb-free) Sol­der Spheres includ­ing SAC105, SAC125N, SAC305, SAC387, SAC396 or SAC405 and 4N Pure Tin Sn100 Sol­der Spheres.

We also now offer Bi58Sn42 Eutec­tic Lead­free Sol­der Spheres and Bi57Sn42Ag1 Near-Eutec­tic Lead­free Sol­der Spheres. You can also con­tact us if you have fur­ther ques­tions on buy­ing sol­der balls.

About Chris Perabo

Chris is an energetic and enthusiastic engineer and entrepreneur. He is always interested in taking highly technical subjects and distilling these to their essence so that even the layman can understand. He loves to get into the technical details of an issue and then understand how it can be useful for specific customers and applications. Chris is currently the Director of Business Development at CAPLINQ.

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