Switch thermal design: Scenario-based selection guide for TIM thermal interface materials

Data center switches are rapidly upgrading to high bandwidth and high power density. The heat and power consumption of core components such as switching chips, CPUs, power supplies and optical modules are continuously increasing. Under long-term high-load operation of the equipment, the stability of the heat dissipation and thermal conduction links is of vital importance. Thermal interface materials (TIM) are no longer just simple filler materials; they have become the key core materials that ensure the heat dissipation efficiency and long-term operational reliability of the switches.

The selection of materials for the cooling system of a switch is not good or bad in any specific sense; it is based on the actual application conditions. Reasonably matching the thermal interface materials can not only effectively lower and control the temperature, but also reduce equipment failures under high and low temperature cycling conditions, thereby extending the overall service life of the equipment.
Data center switch cooling.

The core of the selection of the three major mainstream thermal interface materials: Tailor-made for specific scenarios
The commonly used thermal interface materials for switches can be classified into three types: thermal silicone sheets, thermal gels, and thermal phase-change materials. Ziitek, based on the position of the switching device, structural tolerances, and requirements of mass production processes, specifically selects and adapts thermal solutions to balance both heat dissipation performance and practicality for mass production.

1. Thermal conductive silicone pad : Specialized for Large Gap and High Tolerance Structures

Thermal conductive silicone pad is suitable for scenarios where there are fixed assembly gaps and large structural tolerances, such as power modules and auxiliary chips. It has excellent compression and rebound performance, which can offset assembly size deviations, has strong adhesion stability, is resistant to aging and cyclic stress, is simple to assemble and easy to maintain, and meets the requirements of conventional heat dissipation.

2. Thermal Conductive gel: Complex Structure, Automated Mass Production Compatibility

The thermal conductive gel is suitable for scenarios with densely packed components, highly staggered layouts, and complex-shaped contact surfaces. It has good fluid form fitting and lower contact thermal resistance, resulting in excellent heat dissipation performance. It is compatible with automated dispensing processes, has high production efficiency, and is suitable for use in large-scale switch production lines.
 

3. Thermal Conductivity Phase Change Materials: Specialized for High Heat Flux Core Components

Thermal conductivity phase change is specifically designed for key components with high heat flux such as main chips and core CPUs, suitable for core cooling scenarios with small structural gaps and strict heat dissipation requirements. At room temperature, it is in a solid sheet form, and after heating, it undergoes phase change and softens, being able to fully penetrate the microscopic gaps of the contact surface, with a very low interface thermal resistance and excellent thermal conductivity and heat exchange efficiency. It is not prone to aging or failure under long-term high and low temperature cycling conditions, and its heat dissipation performance is stable and durable, providing long-term heat dissipation protection for the core high-heat components of switches.