A lot of dear friends in the face of direct plug with patch element selection, do not know that it is more suitable, the following nine wood to talk about his analysis.

SMT components have high assembly density, small volume and light weight. The volume and weight of SMT components are only about 1/10 of that of conventional cartridge components. After SMT is generally adopted, the volume of electronic products is reduced by 40%~60% and the weight is reduced by 60%~80%. High reliability, strong vibration resistance. Low solder joint defect rate. Good high frequency characteristics. Reduced electromagnetic and radio frequency interference. Easy to achieve automation, improve production efficiency. Reduce cost by 30%~50%. Save materials, energy, equipment, manpower, time, etc.

But the patch is less solid than the plug-in

Patch components, small size, less PCB layout, short wiring distance between components, good high-frequency performance, reduce the size of equipment, especially for portable handheld devices.

However, patch components have their shortcomings, because it is a patch, so the production equipment requirements are higher, at the same time, the quality of the device requirements are higher. For example, SMT device machine production, generally requires components out of the factory within a year, otherwise the device because of too long storage time, resulting in the oxidation of the pad, poor welding, especially the smaller the package, the higher the quality requirements.

In addition, capacitors and inductors are easy to be confused because they are not marked. Therefore, it is recommended to store them in the sample bar instead of small boxes, so as to avoid confusion and improve the storage time

For some small signal devices, such as resistance class, chip capacitor class, control chip class and so on

The adoption of the patch will be better than the plug-in, because the production process is easier to control, the process defect rate is low, and the price of some materials better than the plug-in. But relative to the plug-in seismic ability is poor. But the overall patch is better than the plug-in

Then for power type devices such as MOSFET, electrolytic capacitors, power resistance plugins will be good with the patch.

Because the power device is more serious, the heat dissipation of the plug-in is better than the patch, as you said 70N06 plug-in is better.