RJ45 connectors are fundamental components in Ethernet systems, but engineers often face a design-level decision: Should you use an Integrated RJ45 (MagJack) or a Modular RJ45 (without discrete magnetics)?
This article, tailored for engineers, product designers, and EMS professionals, dives deep into the trade-offs between these two connector architectures—helping you make an informed decision for performance, cost, and manufacturability.
A Modular RJ45 provides just the jack. The magnetics are mounted separately as discrete components.
Feature | Integrated RJ45 | Modular RJ45 |
---|---|---|
Magnetics | Built-in | External |
PCB Complexity | Low | High |
Layout Flexibility | Limited | High |
EMI/SI Tuning | Pre-set | Customizable |
Assembly | Simplified | More steps |
Servicing | Replace full module | Replace part |
Cost (Low Volume) | Higher | Lower |
Cost (High Volume) | Competitive | Potentially cheaper |
You need rapid prototyping or fast time-to-market
Space is constrained (e.g., IoT boards, routers)
You prefer plug-and-play EMI compliance
The choice between integrated and modular RJ45 designs isn't just about price—it's about control, complexity, and context.
At RJ45-ModularJack.com, we help OEMs and engineers select the best-fit solution from a full range of MagJack and discrete RJ45 options. Whether you're building a compact IoT device or a carrier-grade switch, we support your Ethernet interface design from concept to production.