Example of Creating a Flatpack Package Using Terminal Groups

PartQuest Portal Subscription: Essential or Professional

This example steps you through the process of using Footprint Creator wizard terminal groups to create a custom footprint for a flatpack package of a PartQuest Portal part. A flatpack is a surface mount package with terminals parallel to the seating plane. Terminals can be on 3 or 4 sides. Terminal groups enable you to create collections of terminals with common shapes and dimensions.

Procedure

  1. Use the PartQuest Portal search to find “VT1697SB”, and then from any of the search results, click , and examine the part’s package information.

    Figure 1 shows package information for the VT1697SB part.

    Figure 1. VT1697SB Package Information









  2. From the Search page, start the Footprint Creator wizard.
  3. Use the Package Outline page to specify the package outline style and dimensions using the selections and values from the table below. When you are finished, click Continue to Terminals.

    Datasheet

    Wizard Option

    Wizard Selection/Value

    -

    Package Outline



    Dimensions (mm)

    General, Unit-of-Measure (UOM)

    mm (millimeters)

    -

    General, Mounting Preparation

    Straight Mounted

    -

    General, Body Direction

    Horizontal

    -

    Package Shape



    D=3.75

    Dimensions, Dimension1

    Nominal(mm)=3.75

    E=6.00

    Dimensions, Dimension2

    Nominal(mm)=6

    A1 (MIN)=0.00A1 (NOM)=0.02A1 (MAX)=0.05

    Dimensions, Vertical Dimension, Standoff

    • Minimum(mm)=0

    • Nominal(mm)=0.02

    • Maximum(mm)=0.05

    A (MIN)=0.90A (NOM)=0.95A (MAX)=1.00

    Dimensions, Vertical Dimension, Body Height

    • Minimum(mm)=0.9

    • Nominal(mm)=0.95

    • Maximum(mm)=1

    Note 1: To calculate the offset from the center line (CL) to the center of the left terminal contact area (X11), see the datasheet BOTTOM VIEW. The center-to-center distance between two terminals is dimension e=0.5. The offset from the CL to the center of the terminal to the immediate left of the CL is 0.276. A negative X offset value indicates to the Footprint Creator wizard that the offset is to the left of the CL. The total offset (X11) is -1.276 = -[(2 x 0.5) + 0.276].

    The following shows the 2D package view, which results from the package outline options.



  4. Use the Terminals page to specify five terminal groups and follows:

    You can refer to the following diagram to see how the example’s terminal groups are organized.



    1. Use the Terminals page, Terminal Group #1 tab to specify the package terminal type and dimensions from the table below. When you are finished, click the + icon.
      Table 1. Terminal Group #1: Pins 11-16

      Datasheet

      Wizard Option

      Wizard Selection/Value

      -

      Terminal



      -

      Terminal Position



      -

      Additional Terminal Position Information

      Edge-In, Back



      -

      Additional Terminal Position Information, Rows/Columns

      NX=6

      -

      Additional Terminal Position Information, Terminal Function

      Electrical

      -

      Terminal Shape



      -

      Terminal Shape, X Offset, Body X Reference



      -

      Terminal Shape, X Offset, Terminal X Reference



      -

      Terminal Shape, X Offset, Terminal X Reference, Offset

      See Table Note 1.

      Nominal(mm) = -1.276

      e = 0.50

      Terminal Contact Positions, Pitch (x)

      Nominal(mm) = 0.5

      b (MIN) = 0.20b (NOM) = 0.25b (MAX = 0.30

      Terminal Dimension (T.Dim), Dimension1

      • Minimum(mm) = 0.2

      • Nominal(mm) = 0.25

      • Maximum(mm) = 0.3

      0.60 +/-0.10

      Terminal Dimension (T.Dim), Dimension2

      • -Tolerance(mm) = 0.1

      • Nominal(mm) = 0.6

      • + Tolerance(mm) = 0.1

      A3 = 0.20

      Terminal Dimension (T.Dim), Terminal Height

      Nominal(mm) = 0.2

      A1 (MIN) = 0.00A1 (NOM) = 0.02A1 (MAX) = 0.05

      Terminal Dimension (T.Dim), Exposed Terminal Thickness

      • Minimum(mm) = 0

      • Nominal(mm) = 0.02

      • Maximum(mm) = 0.05

      The following shows the 2D package view, which results from the Terminal Group #1 options.



    2. Use the Terminals page, Terminal Group #2 tab to specify the package terminal type and dimensions from the table below. When you are finished, click the + icon.
      Table 2. Terminal Group #2: Pins 6-9

      Datasheet

      Wizard Option

      Wizard Selection/Value

      -

      Terminal



      -

      Terminal Position



      -

      Additional Terminal Position Information

      Edge-in, Right



      -

      Additional Terminal Position Information, Rows/Columns

      NY = 4

      -

      Additional Terminal Position Information, Terminal Function

      Electrical

      -

      Terminal Shape



      -

      Terminal Shape, Y Offset, Body Y Reference



      -

      Terminal Shape, Y Offset, Terminal Y Reference



      1.948

      Terminal Shape, Y Offset, Terminal Y Reference, Offset

      Nominal(mm) = 1.948

      2e = 2x0.5

      Terminal Contact Positions, Pitch (Y)

      Nominal(mm) = 1.0

      1.70+/-0.10

      Terminal Dimension (T.Dim), Dimension1

      • -Tolerance(mm) = 0.1

      • Nominal(mm) = 1.7

      • + Tolerance(mm) = 0.1

      b (MIN) = 0.20b (NOM) = 0.25b(MAX = 0.30

      Terminal Dimension (T.Dim), Dimension2

      • Minimum(mm) = 0.2

      • Nominal(mm) = 0.25

      • Maximum(mm) = 0.3

      A3 = 0.20

      Terminal Dimension (T.Dim), Terminal Height

      Nominal(mm) = 0.2

      A1 (MIN) = 0.00A1 (NOM) = 0.02A1 (MAX) = 0.05

      Terminal Dimension (T.Dim), Exposed Terminal Thickness

      • Minimum(mm) = 0

      • Nominal(mm) = 0.02

      • Maximum(mm) = 0.05

      The following shows the 2D package view, which results from the Terminal Group #2 options.



    3. Use the Terminals page, Terminal Group #3 tab to specify the package terminal type and dimensions from the table below. When you are finished, click the + icon.
      Table 3. Terminal Group #3: Pins 2-5

      Datasheet

      Wizard Option

      Wizard Selection/Value

      -

      Terminal



      -

      Terminal Position



      -

      Additional Terminal Position Information

      Edge-In, Left



      -

      Additional Terminal Position Information, Rows/Columns

      NY = 4

      -

      Additional Terminal Position Information, Terminal Function

      Electrical

      -

      Terminal Shape



      -

      Terminal Shape, Y Offset, Body Y Reference



      -

      Terminal Shape, Y Offset, Terminal Y Reference



      -1 x 0.552

      Terminal Shape, Y Offset, Terminal Y Reference, Offset

      See Table Note 2.

      Nominal(mm) = -0.552

      2e = 2x0.5

      Terminal Contact Positions, Pitch (y)

      Nominal(mm) = 1.0

      1.70+/-0.10

      Terminal Dimension (T.Dim), Dimension1

      • -Tolerance(mm) = 0.1

      • Nominal(mm) = 1.7

      • + Tolerance(mm) = 0.1

      b (MIN) = 0.20b (NOM) = 0.25b(MAX = 0.30

      Terminal Dimension (T.Dim), Dimension2

      • Minimum(mm) = 0.2

      • Nominal(mm) = 0.25

      • Maximum(mm) = 0.3

      A3 = 0.20

      Terminal Dimension (T.Dim), Terminal Height

      Nominal(mm) = 0.2

      A1 (MIN) = 0.00A1 (NOM) = 0.02A1 (MAX) = 0.05

      Terminal Dimension (T.Dim), Exposed Terminal Thickness

      • Minimum(mm) = 0

      • Nominal(mm) = 0.02

      • Maximum(mm) = 0.05

      Table Note 2: A negative Y offset value indicates to the Footprint Creator wizard that the offset is below the package body center line.

      The following shows the 2D package view, which results from the Terminal Group #3 options.



    4. Use the Terminals page, Terminal Group #4 tab to specify the package terminal type and dimensions from the table below. When you are finished, click the + icon.
      Table 4. Terminal Group #4: Pin 1

      Datasheet

      Wizard Option

      Wizard Selection/Value

      -

      Terminal



      -

      Terminal Position



      -

      Additional Terminal Position Information

      Edge-In, Left



      -

      Additional Terminal Position Information, Rows/Columns

      NY = 1

      -

      Additional Terminal Position Information, Terminal Function

      Electrical

      -

      Terminal Shape



      -

      Terminal Shape, Y Offset, Body Y Reference



      -

      Terminal Shape, Y Offset, Terminal Y Reference



      2x0.5 + 0.552

      Terminal Shape, Y Offset, Terminal Y Reference, Offset

      See Table Note 3.

      Nominal(mm) = -1.552

      2.5+/-0.10

      Terminal Dimension (T.Dim), Dimension1

      • -Tolerance(mm) = 0.1

      • Nominal(mm) = 2.5

      • + Tolerance(mm) = 0.1

      b (MIN) = 0.20b (NOM) = 0.25b(MAX = 0.30

      Terminal Dimension (T.Dim), Dimension2

      • Minimum(mm) = 0.2

      • Nominal(mm) = 0.25

      • Maximum(mm) = 0.3

      A3 = 0.20

      Terminal Dimension (T.Dim), Terminal Height

      Nominal(mm) = 0.2

      A1 (MIN) = 0.00A1 (NOM) = 0.02A1 (MAX) = 0.05

      Terminal Dimension (T.Dim), Exposed Terminal Thickness

      • Minimum(mm) = 0

      • Nominal(mm) = 0.02

      • Maximum(mm) = 0.05

      Table Note 3: A negative Y offset value indicates to the Footprint Creator wizard that the offset is below the package body center line.

      The following shows the 2D package view, which results from the Terminal Group #4 options.



    5. Use the Terminals page, Terminal Group #5 tab to specify the package terminal type and dimensions from the table below.
      Table 5. Terminal Group #5: Pin 10

      Datasheet

      Wizard Option

      Wizard Selection/Value

      -

      Terminal



      -

      Terminal Position



      -

      Additional Terminal Position Information

      Edge-In, Right



      -

      Additional Terminal Position Information, Rows/Columns

      NY = 1

      -

      Additional Terminal Position Information, Terminal Function

      Electrical

      -

      Terminal Shape



      -

      Terminal Shape, Y Offset, Body Y Reference



      -

      Terminal Shape, Y Offset, Terminal Y Reference



      2x0.5 + 0.552

      Terminal Shape, Y Offset, Terminal Y Reference, Offset

      See Table Note 4.

      Nominal(mm) = -1.552

      0.60+/-0.10

      Terminal Dimension (T.Dim), Dimension1

      • -Tolerance(mm) = 0.1

      • Nominal(mm) = 0.6

      • + Tolerance(mm) = 0.1

      b (MIN) = 0.20b (NOM) = 0.25b(MAX = 0.30

      Terminal Dimension (T.Dim), Dimension2

      • Minimum(mm) = 0.2

      • Nominal(mm) = 0.25

      • Maximum(mm) = 0.3

      A3 = 0.20

      Terminal Dimension (T.Dim), Terminal Height

      Nominal(mm) = 0.2

      A1 (MIN) = 0.00A1 (NOM) = 0.02A1 (MAX) = 0.05

      Terminal Dimension (T.Dim), Exposed Terminal Thickness

      • Minimum(mm) = 0

      • Nominal(mm) = 0.02

      • Maximum(mm) = 0.05

      Note 4: A negative Y offset value indicates to the Footprint Creator wizard that the offset is below the package body center line.

      The following shows the 2D package view, which results from the Terminal Group #5 options.



    6. Click Continue to Details.
  5. Use the Details page to specify the package terminal numbering pattern and package-body material as follows:
    1. From the 2D package preview, select the terminals on the left edge of the package by clicking the lower-left terminal, and then shift-clicking the upper-left terminal.

      The tool highlights the terminals.

    2. Click

      , choose Numerical from the dropdown list, and then type 1-5 in the text entry field.

      The following shows the 2D package view, which results from the terminal numbering pattern.



    3. From the 2D package preview, select the terminals on the right edge of the package by clicking the upper-right terminal, and then shift-clicking the lower-right terminal.
    4. Click

      , choose Numerical from the dropdown list, and then type 6-10 in the text entry field.

      The following shows the 2D package view, which results from the terminal numbering pattern.



    5. From the 2D package preview, select the terminals on the bottom edge of the package by clicking the lower-right terminal, and then shift-clicking the lower-left terminal.
    6. Click

      , select Numerical from the dropdown list, and then type 11-16 in the text entry field.

      The following shows the 2D package view, which results from the terminal numbering pattern.



    7. Choose Plastic from the Package-body Material list, and then click Continue to Validate.
  6. Use the Validate page to view the footprint for various target design densities.

    The following 2D package view shows the footprint summary generated by the Footprint Creator wizard for the VT1697SB part package and a target design density setting of nominal material condition (nominal density).



    The Footprint Creator wizard displays the footprint summary as follows:

    Manufacturing Process Part is Compatible with:

    • SMT (May require special attention)

    • Manual Placement

    • Manual Solder - Low Volume High Mix (May require special attention)

    • Manual Solder - High Volume Low Mix (May require special attention)

    Solder Mask Clearance — 60.0 µm

    Stencil Thickness Allowable:

    • 75 µm (3mil)

    • 100 µm (4mil)

    • 125 µm (5mil)

    • 150 µm (6mil) (May require special attention)

    Solder Paste Size — Solder Paste Aperture is set to 1:1 with the Pad.

Results

The flatpack package footprint with multiple terminal groups is complete.