Recycling electronic waste is one of the main environmental challenges faced by society today. In this sense, the purpose of this study is to evaluate the effect of using the residue of printed circuit boards (PCB) as a substitute for sand in mortars. The boards were taken from discarded electronic equipment and, to obtain the granular material, the boards, free of their components, were crushed. The residue obtained was sieved and separated into four granulometric ranges: # 1.2 mm; # 0.6 mm; # 0.3 mm and # 0.15 mm. Mortars were produced with partial replacement of 5% and 10% of the sand with the equivalent volume of residue in each of the size ranges, in addition to a reference mortar, without residue. For the characterization of the mortars, compressive strength, water absorption, percentage of voids and density tests were performed, in addition to analysis by scanning electron microscopy and environmental, leaching and solubilization, analyses. In general, the properties of the mortars, with the incorporation of the PCB residue, were not affected by the introduction of the residue, making its use feasible. However, as it is classified as non-inert in environmental analysis it is necessary to control its final disposal.