We report on current-voltage measurements of the zero-field normal-superconducting phase transition in thin films of Pr 2−x Ce x CuO 4−y as a function of doping. We find that the small size of the critical regime in these materials ͑Ϸ25 mK͒ gives rise to mean-field behavior at the phase transition with a static exponent of Ϸ 0.5 for all dopings ͑in contrast to hole-doped YBa 2 Cu 3 O 7−␦ ͒. We also find mean-field behavior in the dynamic exponent z. This indicates that Pr 2−x Ce x CuO 4−y behaves similarly to conventional superconductors in contrast to other cuprate superconductors. However, as the transition width in our samples decreases, the dynamic critical exponent approaches z = 1.5, similar to the critical exponent found in hole-doped YBa 2 Cu 3 O 7−␦ .