Wiring up a Jetson Orin NX is the easy part; keeping it cool and well-mounted inside an industrial enclosure is where most prototypes fall short. This is a practical, step-by-step guide to mounting and cooling an Orin NX so it runs reliably for years — no thermal throttling, no fan failures, no embarrassing field returns.
Step 1: Choose the Thermal Interface Material (TIM)
The gap between the module and the heatsink base is filled with a thermal interface material. Use a quality silicone pad or thermal paste rated for the power density of the module. For production, an elastomeric pad is more repeatable than paste and easier to assemble. Specify the pad thickness to guarantee good contact under the mounting pressure of the heatsink.
Step 2: Mount the Heatsink Base Correctly
The heatsink base must sit flush against the module with even pressure. Use the mounting holes on the carrier board — never rely on clips that can tilt and break the thermal bond. Torque screws evenly, in a cross pattern, to avoid bending the PCB. If the module uses thermal pads on both sides, keep both in contact during assembly.
Step 3: Design the Conduction Path
Heat flows module → TIM → base plate → fin array → air. Keep that chain short and continuous:
- Use an aluminum or copper base plate that fully covers the module footprint.
- Avoid cutouts or standoffs that break the thermal path.
- Anodized black surfaces radiate better and resist corrosion.
Step 4: Decide Passive vs Active
For passive, ensure free space above the fins for natural convection — vertical orientation is best. For active, position the industrial fan so it pushes air through the fin array, not just around the chassis. Filtered intake helps in dusty environments, but filter cleaning becomes part of maintenance. Read the passive vs active trade-offs before committing.
Step 5: Plan I/O Cutouts and Antennas
Cutouts for Ethernet, USB, power and video should be specified in the drawing so the chassis is sealed and finished in one pass. External antennas need SMA or N-type pass-throughs with a proper gasket to preserve the IP rating. Avoid placing connectors over the fin array, where they block airflow.
Common Mistakes to Avoid
- Too little TIM: a thin or oversized pad leaves an air gap and reduces conduction sharply.
- Fanless design without clearance: no space above the fins means no convection — the chassis turns into a heat trap.
- Sealing a fanless chassis too well: high-IP sealing without a conduction design causes throttling. Match the IP rating to the real environment.
- Skipping the thermal test: an estimate is not proof. Ask for a measured thermal test report on the first article.