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The Effect Of PCB Through Hole On Heat Dissipation

Edit:Xing DA Electric Technology Co.,LtdUpDate:Dec 26, 2017

                                     The effect of PCB through hole on heat dissipation

In natural convection heat dissipation products, the size of the hole in the PCB flexible printed circuit board has a great effect on heat dissipation. But how big is it, i don’t know. Let’s start with simple product analysis, the parameters of the hole of a single chip are the object, the influence of hole parameters on thermal conductivity is studied.

 

Condition:

4layer PCB flexible printed circuit board dimensions 100×100×1.6mm

Chip size:40×40×3mm

Cross hole range: 40×40mm

Copper plating thickness: 0.025mm

Hole spacing: 1.2mm

Fill the hole: air

For the hole, the main parameters are the following parameters:

Hole diameter

Number of holes

The thickness of the plating copper

Of course, manual can also be calculated(parallel conduction):

图片1.png

But now that we have the software, we can use the software to quickly calculate the changes in various combinations:

1. The impact of hole diameter (other parameters unchanged)

The thickness of the plating copper

0.025mm

Cross hole range

1.2mm

Number of holes

40×40

hole diameter

Change parameters

 

hole diameter

Thermal conductivity via XY:W/m-K

Thermal conductivity via Z:W/m-k

0.1

0.38

1.95

0.2

0.346

4.12

0.3

0.338

6.28

0.4

0.334

8.41

0.5

0.333

10.5

 

 

图片2.png 

图片3.png

 

 

2. The impact of number of holes (other parameters unchanged)

 

 

 

The thickness of the plating copper

0.025mm

Cross hole range

1.2mm

Number of holes

Change parameters

hole diameter

0.2mm

In order to ensure that the hole cover area is roughly the same, the spacing also changes with the number of holes

Number of holes

Cross hole range

Thermal conductivity via XY:W/m-K

Thermal conductivity via Z:W/m-k

10×10

5mm

0.327

0.56

15×15

3.33mm

0.33

0.84

20×20

2.5mm

0.334

1.23

25×25

2mm

0.337

1.72

30×30

1.66mm

0.34

2.33

 

图片4.png

 

图片5.png 

 

 

3. The impact thickness of the perforated copper foil (other parameters unchanged)

The thickness of the plating copper

Change parameters

Cross hole range

1.2mm

Number of holes

40×40

hole diameter

0.3mm

In order to ensure that the hole cover area is roughly the same, the spacing also changes with the number of holes.

thickness mm

Thermal conductivity via XY:W/m-K

Thermal conductivity via Z:W/m-k

0.017

0.325

4.482

0.025

0.338

6.283

0.035

0.355

8.376

0.045

0.374

10.29

0.055

0.394

12.04

 

图片6.png 

图片7.png 

 

 

 

Conclusion:

The purpose of heating the hole is to enhance Z’s ability to heat conduction, allow the heating component to cool quickly. Therefore, combined with the above date, we can find that increase the hole diameter ,increase the thickness of the plating and increase the number of holes can significantly strengthen the conduction of Z direction.