Package components
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carlo.sterpa97 1 week ago
Hi guys , I'm making a PCB and I used this package. It seems to me however that the dimensions are not correct am I wrong? ![image](https://i.ibb.co/nm61Rgg/test.png)
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andyfierman 1 week ago
Wrong compared to what? There is no one fixed standard for SMT pad sizes since different manufacturers sometimes specify different dimensions and these may differ from JEDEC and IPC sizes. Please provide diagrams/dimensions to illustrate your question.
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carlo.sterpa97 1 week ago
``` I have to make a pcb with SMD components, in particular with the 0603 package. As I know this package is a standard one with fixed dimensions, but then why can the pad change in size? ```
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MikeDB 1 week ago
@carlo.sterpa97 The pad size is determined by what power you wish to dissipate.  Unlike leaded components where some of the heat goes out through the body, and there are bare wires to the air as well, an SMT device is very small and relies on the pad to get rid of the heat.  In advanced PCB tools you can enter the heat dissipation of the resistor and it will chose the appropriate pad size.  But EasyEDA is free so you have to choose the one you need by hand.
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andyfierman 1 week ago
Unless it is named specifically given the same name as the Schematic Symbol it is assigned to, a PCB Footprint in EasyEDA may be used by many different part numbers so there is no guarantee that it is exactly correct for the particular physical part that you have chosen. There are also different pad sizes available for IR reflow, wave and hand soldering assembly. If you need a specific PCB Footprint to exactly match the particular physical part that you have chosen then please read (2.3) in (2) in: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a)
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