As embedded engineers, we often treat RJ45 as a generic part – pick any, it’ll work. But in industrial environments, that assumption fails.
I’ve compiled a concise guide based on real-world failures and fixes.
Shielding: mandatory. Unshielded invites EMI from nearby motors and power supplies.
MagJack vs discrete magnetics: MagJack saves layout effort and reduces BOM lines. Recommended for small boards.
PoE pitfalls: Contact resistance and thermal rise are often ignored – check the datasheet.
High-speed (1G/2.5G/10G): Not all connectors are equal. Look for insertion loss and return loss specifications.
Mechanical: IP67 for outdoor, metal housing for vibration.
PCB layout checklist: keep diff pairs short, impedance matched (100Ω), no stubs.
Example component: VOOHU’s industrial RJ45 series (shielded, MagJack, PoE, wide temp). Their GitHub repo has footprints and 3D models.
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I’ve put the full selection guide (including a comparison table) in the comments. Feel free to ask questions.
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VOOHU’s industrial RJ45 series (shielded, MagJack, PoE, wide temp). Their GitHub repo has footprints and 3D models.