SMT Chip
A SMT chip is an integrated circuit in an SMT package. SMT stands for surface mount technology, which means the chip is mounted on the surface. Unlike through-hole components, SMT's don't have pins that go through the board. The advantage in doing so is that you can run traces underneath the pads, but in this tutorial we will just stick to a single sided board. The particular chip we will be using is the LM311M. When identifying pin 1, look for a pad larger than the rest or a rectangular border around it on the PCB board.
Getting Started
Reminder: Get out of any selected tool by pressing "escape."
First open up both the Component Editor and the Pattern Editor and then open the two files you created in the introduction.
Remember to change units go to view> units> and select the correct unit of measurement.
Step One
In the component editor make sure you have a new component, otherwise just create a new one by going to Component> add new to library.
In the component properties box in the upper right corner input the following values: name = LM311M, Type = rectangle, RefDes = U, Width = 8mm, Pin Spacing = 3mm, left pins = 4, right pins = 4.
Now use the rectangle tool to draw a rectangle in the center touching all pins.
Save your work now.
Step Two
Now we have to create the physical representation of the SMT.
Go to the pattern editor. Make a new pattern if there isn't one already by going to pattern > add new to library
Fill in the same information as you did with the component editor in the pattern properties box. Now in pattern properties box set type as lines with the following values: number 1 = 2, number 2 = 8, spacing 1 = 1.27mm, spacing 2 = 6mm.
Select all the pads, then right click on one of them and select pad properties. Deselect Default for pattern. Set shape to rectangle, width to .5mm and height to 1.5mm. Change through to surface and make hole 0mm.
Select pad 1 and change height from 1.5 to 2mm.
Select the Rectangle tool and draw a rectangle around pad 1.
Save your work.
Step Three
We are now on the last and easiest step. In the component editor go to Component> attach pattern. In the library section, click on add and add your pattern file. Select LM311M, which we just created. If everything was done correctly, pin one should match up with pad one and so on.
Save your work.