Ethernet Connector Factory China: Specifying an RJ45 Jack

Author : wei yi | Published On : 04 Nov 2026

Locking a PCB footprint before checking the RJ45 drawing invites rework. Get exact pin positions, latch orientation and shield details from an Ethernet connector factory in China.

Lock the footprint and mechanical drawing before choosing a PCB jack. A through-hole footprint should be frozen against real pin dimensions before a PCB panel is released. Confirm whether integrated magnetics are required or located elsewhere in the circuit. Integrated-magnetics designs and discrete-magnetics boards need different schematic and layout decisions. Choose shielded or unshielded construction based on the system's EMC design.

Magnetics and electrical requirements

Check the intended speed and applicable connector specifications. Shield grounding and the enclosure aperture affect EMC behaviour alongside the connector specification. Verify the tab orientation, LED positions and pin count against the enclosure opening. Review insertion force, mating cycles and contact plating specification. LED window position and latch direction can be difficult to change after toolings are fixed.

Consider PoE current and temperature rise in the board's power design.

Board assembly and reliability

Inspect solder coplanarity and handling on a sample from the real production process. PoE designs require current and heating checks based on the applicable implementation. Ask for drawings, test reports and an approved product change notification procedure. Compare packaging formats against the assembly line's feeder and handling needs. Mating-cycle life and insertion force matter for products that are unplugged frequently in the field.

Check traceability and inspection sampling across incoming batches.