PartQuest Portal Subscription: Essential tier
You use the Package Outline page of the Footprint Creator wizard to
specify the package outline of a custom footprint. A PartQuest Portal footprint package
outline is specified by the general characteristics of the package, the shape of the
package, and the detailed dimensions of the body.
As you build a package, the right panel displays
a top-down, two-dimensional (2D) preview of the package. The dimensions
of the package outline appear as you specify them.
Tip
For more information
about an package outline option, click the information icon () to display a cross
reference to the section of the JEDEC standard that defines the
package outline term or dimension.
Prerequisites
-
You have logged into the PartQuest Portal website with your Siemens
account. See “Signing In to the PartQuest Portal Application”.
-
You have detailed package information from the
part manufacturer.
Tip
If a dimension
is not found in the datasheet, there is no need for you to provide
that dimension in the Footprint Creator wizard. The wizard calculates
dimensions and applies the rules of the JEDEC standards for electronic
device package descriptions automatically. Enter only data that
is provided in the part datasheet.
-
You have opened the Footprint Creator wizard (from
the home page, click Create Footprint,
and then from the My Footprints page, click Create
Footprint).
Procedure
-
From the Package Outline section, choose a package
outline type.
If the Extended Package
Outline section appears, choose an option from this section too.
-
From the General section, choose general specifications
of the package as follows:
-
Choose a Unit-of-Measure (UOM) as defined by
the datasheet.
Tip
If the datasheet provides both imperial and metric
units, select “mm (millimeters)”.
-
Choose a mounting preparation.
The wizard displays
mounting preparation options appropriate for the package outline
you selected. For example, small outline packages do not require
prepping prior to mounting and so the wizard displays the straight
mounted option only.
-
Choose a body direction.
The wizard displays
body direction options appropriate for the package outline you selected.
For example, small outline devices are always placed in the horizontal direction
on the board and so the wizard displays the horizontal option only.
-
From the Package Shape section, choose a shape
that most closely represents the package body.
The wizard displays package
shape options appropriate for the package outline you selected.
For example, small outline devices are always a rectangle package
shape.
-
Enter package dimensions as follows:
-
From the Dimensions section, type the minimum,
nominal (typical), and maximum package dimension values provided
in the datasheet.
Datasheets vary in
how they provide dimension information. For example, some datasheets
provide nominal values with minimum and maximum values of a dimension.
Other datasheets will provide a nominal dimension with a positive
and negative tolerance. You can specify the dimensions using either
approach. Nominal is sometimes referred to as typical by some datasheets.
Tip
Enter all of
the dimensions provided in the datasheet. Do not compute dimensions that
are not provided in the datasheet. The wizard extrapolates unspecified dimensions
from known dimensions.
-
View the 2D preview of the package to confirm
that the package dimensions are correct.
-
Click Continue to
Terminals.
Either the Footprint
Creator wizard Terminals page displays or a popup error message displays
that indicates the mandatory dimensions that are missing. Options
with errors appear in red on the Package Outline page.
Results
The wizard generates a package outline with the
dimensions that you specified. You are ready to specify the terminals
(pins) of the package.