Magnetic-susceptibility and electrical-resistivity measurements have been carried out on equiatomic ternary compounds, RPdSn (R=Ce--Yb), in the temperature range 4.2 and 300 K. The compounds EuPdSn and YbPdSn have been synthesized. As-cast RPdSn (R=Ce--Yb) compounds crystallize in the orthorhombic TiNiSi-type structure. However, on annealing at 950 \ifmmode^\circ\else\textdegree\fi{}C, Er- and Tm-containing compounds transform to hexagonal ${\mathrm{Fe}}_{2}$P-type structure. Magnetic-susceptibility measurements reveal that the compounds with R=Ce, Sm, Eu, Gd, Tb, Dy, and Er order antiferromagnetically with N\'eel temperatures (${\mathit{T}}_{\mathit{N}}$) of 7.5, 11, 13, 14.5, 23.5, 11.4, and 5.6 K, respectively. The compounds with R=Pr, Nd, Ho, and Tm are paramagnetic down to 4.2 K. Susceptibility of YbPdSn shows Curie-Weiss behavior between 300-150 K with ${\mathrm{\ensuremath{\mu}}}_{\mathrm{eff}}$=1.45${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$ and deviates considerably from it below 150 K. The electrical resistivity of all these compounds exhibits metallic behavior and shows a sharp drop at the respective N\'eel temperatures. The ${\mathit{T}}_{\mathit{N}}$ of the RPdSn series does not follow de Gennes scaling and, instead, peaks at Tb. This behavior of ${\mathit{T}}_{\mathit{N}}$ can be understood on the basis of crystalline-electric-field effects.