Abstract: A fully-molded or lidded circuit module assembly having edge-stiffening interlock features provides packaging for memory modules and other circuit modules, while preventing de-lamination of the housing from the circuit supporting structure. The interlock features are provided around the periphery of the circuit supporting structure, which is generally a laminated circuit substrate, and mating features are provided on a lid that interlock with the interlock features or are generated by molding an encapsulation around the circuit supported structure in a fully-molded assembly. The interlocked assembly has added strength in bending, twisting or dropping, preventing internal de-lamination or lid detachment from causing circuit module failure.