PCB Design Guide Thermal Grease Usage
1. Thermal paste is a paste consisting of a special polymer filled with finely divided solid particles.
The polymer can easily be applied to the surface using screen printing or stencil printing and become fixed and functional after the drying or baking process.
The dispersed solid particles provide the thermal conductivity required for the paste to act as a heat sink.
As a replacement for metal foil heat sinks or external fixed heat sinks, thermal paste can be used to create a variety of geometric printed heat sinks directly on the PCB.
An example of a radiator created using thermal grease:
2. Always clearly indicate on which side of the PCB you want to apply thermal paste. This can be on one or both sides.
IMPORTANT: Positions are indicated by proper file naming and clear stacking or sequence instructions in the mechanical layer (see Input Data Requirements - Points 2 and 3 and Mechanical Layer Point 3)
3. When producing the output, include the board outline in the thermal paste layer. It is best to use a small line - such as 0.50mm (20mil) wide - the center of the line is the exact board outline. We will remove this line from the production preparation data.
4. Overall heat sink paste design rules specification:
The area covered with thermal grease must have no solder mask
Overlap on Copper Minimal Radiator Paste (A): 0.20 mm (8 MIL) Overlapped Solder Resist Minimal Radiator Paste (B): 0.10 mm (4 mil) Heatsink Paste and Any Adjacent Solder Mask Openings Minimum distance between (C): 0.50 mm (20 mils) minimum distance between heat sink paste and PCB outline (with NPTH holes and slots) (d) (20 mils) 0.50 mm: minimum heat sink paste line Width: 0.30 mm (12 mils)
5. It is recommended that the final size of the thermal via be between 0.80mm (32mil) and 1.20mm (48mil).
6. The recommended thermal paste coating thickness is 100μ (4mil) or 200μ (8mil).
7. After plating, the thermal paste should not be immersed in silver or immersed in tin.
The advantage of entertainment tablet lies in having a powerful chip and excellent hardware. If you want to play various online videos on the tablet and run various software smoothly, the performance of the hardware is an absolute prerequisite. In addition, a high-speed and stable WIFI module is also required, which must be compatible with multiple 802.11 B/G/N protocols at the same time, so that the webpage can be loaded instantly when the webpage is opened, and the online video can be played smoothly. So hardware is the premise and foundation, without good performance everything else is empty talk.
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