In this paper, we consider a class of nonclassical diffusion equations on R N with hereditary memory, in presence of singularly oscillating external forces depending on a positive parameter and a new class of nonlinearities, which have no restriction on the upper growth of the nonlinearity. Under a general assumption on the memory kernel and for a very large class of nonlinearities, we prove the existence of uniform attractors in H 1 (R N) × L 2 (R + , H 1 (R N)). The uniform boundedness (w.r.t.) and the convergence of uniform attractors as tends to 0 are also studied. Our results extend and improve some results in Anh and Toan.