Molex 95503 Series Cat 3 PCB Mount Vertical Standard Profile RJ Modular Jacks 95503 series Cat 3 SMT and through hole PCB mount vertical RJ45 and RJ11 modular jacks with a standard profile (15.7 mm in height), industry standard footprint. These 95503 series cat 3 modular jacks have PCB location and retention and high reliability gold plated square contacts. The through hole PCB mounting RJ modular jacks are also SMT compatible. All models are highly reliable and excellent quality.