In this study, we report the observation of various conduction mechanisms in mechanically exfoliated PbSnSe 2 based on temperature-dependent current and voltage characteristics. A transition from direct tunneling to Fowler-Nordheim tunneling in PbSnSe 2 was observed at 2.63 V. At lower temperatures, the 3D Mott variable range hopping model fits the data, yielding a density of states of ∼8.80 × 10 20 eV -1 cm -3 at 2 V. The values of W hop and R hop were 64 meV and 22.7 nm, respectively, at 250 K. The Poole-Frenkel conduction was observed in the Au/PbSnSe 2 /Au device and the dielectric constant of PbSnSe 2 was calculated to be 1.4. At intermediate voltages, a space charge limited current with an exponential distribution of traps was observed and a trap density of ∼9.53 × 10 13 cm -3 and a trap characteristic temperature of 430 K were calculated for the Au/PbSnSe 2 /Au device.