Thermal Interface Material Selection for Jetson Orin Nano/NX Fanless Design

Issue Overview

Users are seeking guidance on selecting an appropriate thermal interface material (TIM) or thermal grease for use with the Nvidia Jetson Orin Nano/NX platform in a fanless configuration. Specifically, the inquiry relates to the interface between the bottom surface of an aluminum alloy chassis (with top fins) and the top surface of the Nvidia SoC when the fan is removed. The user is looking for recommendations on specific types or part numbers of thermal grease, with a preference for materials that have thermal conductivity greater than 6.0 W/mK.

Possible Causes

The need for this information may arise from several factors:

1. Custom Cooling Solution: Users might be designing a custom cooling solution that deviates from the standard fan-based cooling system.
2. Thermal Management Optimization: There could be a desire to optimize thermal management for improved performance or reliability in specific use cases.
3. Space Constraints: Some applications may have limited space, necessitating a fanless design.
4. Noise Reduction: Eliminating the fan could be part of an effort to reduce system noise in sensitive environments.
5. Environmental Considerations: Certain deployment scenarios might preclude the use of fans due to dust, moisture, or other environmental factors.

Troubleshooting Steps, Solutions & Fixes

When selecting a thermal interface material for the Jetson Orin Nano/NX in a fanless configuration, consider the following steps and recommendations:

1. Consult Official Documentation:

   • Refer to the Jetson Orin NX Series Thermal Design Guide provided by Nvidia for official recommendations.
   • This guide likely contains valuable information on thermal management and may include specific TIM recommendations.

2. Consider High-Performance TIMs:

   • The user suggested ShinEtsu X-23-7762 as a potential option.
   • Look for thermal greases with thermal conductivity greater than 6.0 W/mK as per the user’s preference.

3. Explore Ecosystem Vendor Options:

   • Nvidia recommends checking with vendors in their ecosystem for additional TIM options.
   • These vendors may offer specialized solutions tailored for Jetson platforms.

4. Thermal Testing:

   • Conduct thorough thermal testing with any chosen TIM to ensure adequate heat dissipation.
   • Monitor SoC temperatures under various load conditions to verify the effectiveness of the fanless design.

5. Application Method:

   • Follow best practices for applying thermal interface material:
     • Ensure surfaces are clean and free of debris.
     • Apply an appropriate amount of TIM to achieve optimal coverage without excess.
     • Consider using a spreading tool for even distribution.

6. Chassis Design Considerations:

   • Ensure the aluminum alloy chassis with top fins is adequately designed for passive cooling.
   • Optimize fin design and spacing for maximum heat dissipation.

7. Power Management:

   • Implement appropriate power management techniques to reduce heat generation.
   • Consider using Nvidia’s power management APIs to optimize performance and thermal output.

8. Alternative Cooling Solutions:

   • If passive cooling proves insufficient, consider alternative solutions such as:
     • Heat pipes
     • Liquid cooling systems
     • Thermoelectric coolers (TECs)

9. Environmental Factors:

   • Account for the intended operating environment when selecting a TIM.
   • Consider factors such as ambient temperature, humidity, and altitude.

10. Long-term Reliability:

    • Choose a TIM that maintains its properties over time and under thermal cycling.
    • Consider the pump-out effect and select a TIM resistant to this phenomenon.

11. Consult with Thermal Experts:

    • For critical applications, consider consulting with thermal management experts or companies specializing in embedded system cooling solutions.

Remember that removing the fan and modifying the cooling solution may affect the system’s performance and reliability. Ensure that any changes comply with Nvidia’s guidelines and do not void the warranty. Always prioritize the thermal management of the Jetson Orin Nano/NX to maintain optimal performance and longevity of the device.