<p>The thermal and electrical characteristics of nanocomposites made of poly (ethylene-co-vinyl acetate) (EVA) as the matrix and tin oxide (SnO₂) as a reinforcing nanofiller were developed using a straightforward chemical method. By using Fourier-Transform Infrared spectroscopy (FT-IR), X-ray Diffraction (XRD), Transmission electron microscopy (TEM), and differential scanning calorimetry (DSC), the formation of nanocomposites was investigated. The distinctive SnO₂ band at 602&#xa0;cm^− 1 in the FT-IR spectra verified that SnO₂ was attached to EVA. The phase’s purity and the SnO₂ crystals’ structure were revealed by the XRD and TEM analyses. The material’s melting and glass transition temperatures were ascertained by differential scanning calorimetry (DSC) analysis. When there is little SnO₂ present in the EVA matrix, the DSC result indicates tin oxidation. Significant variations in frequency are observed in the investigational values of the dielectric constant ₂, dielectric loss ₁, and _ac. It is discovered that when frequency increases, so do the values of the ′ and ′′. It is discovered that the _ac rises as the frequency does. The σ_AC value at 100&#xa0;Hz was 1.92 × 10^− 10 S·cm^− 1 and rose with frequency, attaining 3.97 × 10^− 9 S·cm^− 1 at 10⁵ Hz. A slight enhancement in σ_AC values is noted with the augmentation of SnO₂ NP loading. The enhancement in conductivity is attributed to the superior amorphous characteristics of the produced nanocomposite, enabled by the integration of SnO₂ nanoparticles. Dielectric investigations revealed that the optimal enhancement was achieved in the EVA/SnO₂ (0.15 SnO₂) nanocomposite sample. Moreover, the imaginary component (ε″) demonstrated a significant reduction in value as the SnO₂ loadings increased from 6.5*10^− 5 to 8.67*10^− 5. The results presented advocate for the utilization of these nanocomposites in nanoelectronics and radioelectronic devices.</p>