Packages - QFN

QFN enables you to create geometry and boundary conditions to represent a quad flat no-lead package.

Name	The Name appears in the Project Manager window, history tree, and 3D Modeler window.
Plane	Plane specifies the plane on which to create the package.
Location	Under Location, specify the starting coordinates for the package geometry relative to center of the 3D Modeler.
Size	Under Size, specify the length of the package in each coordinate direction. The coordinate direction represented by Package Thickness depends on the selected Plane.
Air Gap Under Package	Under Air Gap Under Package, specify the Air Gap thickness and the Air Gap Under Package Material. The thickness of the mold is calculated by subtracting the Air Gap thickness from the Package Thickness.
Mold	Under Mold, specify the Material for the package mold.
OK	Click OK to run the toolkit.
Use Default	Click Use Default to restore the default settings.
Adjust Values	If the package length or number of leads is modified, click Adjust Values to automatically adjust the other QFN component size values.
Cancel	Click Cancel to close the QFN dialog box without running the toolkit.

Leads	Under Leads, specify the number of lead. Also specify the lead length, width, thickness, pitch, and material. If needed, enable Create Rectangular Leads to specify the shape of the leads.
Die Paddle	Under Die Paddle, specify the length of the die paddle in each coordinate direction. The coordinate direction represented by Thickness depends on the selected Plane. Also, specify the die paddle material. If needed, enable Create Chamfered Die Paddle and specify Side 1 (%) and Side 2 (%) to specify the shape of the die.

Die	Under Die, specify the length of the die in each coordinate direction. The coordinate direction represented by Height depends on the selected Plane. Also, specify the die material.
Heating Source Size	Under Heating Source Size, specify the length and width of the die. Also, specify the die power.
Die Attach	Under Die Attach, specify the thickness of the die attach material and the material.

Leads

Under Leads, specify the number of leads, the lead thickness and width, material, foot length, and airgap under the package.

Iron Python Script – QFN.py:

The following is the toolkit's scripting information.

scriptInput = ["ng"]

scriptInput.append("Name:QFN1")

scriptInput.append("Plane:XY")

scriptInput.append("length_Unit:meter")

scriptInput.append("power_unit:W")

scriptInput.append("xS:0.0075")

scriptInput.append("yS:0.0075")

scriptInput.append("zS:0.0")

scriptInput.append("xLength:0.015")

scriptInput.append("yLength:0.015")

scriptInput.append("packThickness:0.0016")

scriptInput.append("WBDiameter:0.00005")

scriptInput.append("Facets:3")

scriptInput.append("WBHeight:0.00015")

scriptInput.append("CBPLength:0.0005")

scriptInput.append("CBPWidth:0.0005")

scriptInput.append("CBPPitch:0.0007")

scriptInput.append("HSSLength:0.3")

scriptInput.append("HSSWidth:0.3")

scriptInput.append("DieXLength:0.00856")

scriptInput.append("DieYLength:0.00856")

scriptInput.append("DieHeight:0.00035")

scriptInput.append("DiePower:1.0")

scriptInput.append("DiePXLength:0.01")

scriptInput.append("DiePYLength:0.01")

scriptInput.append("DiePisChamfered:True")

scriptInput.append("Chamferside1:85")

scriptInput.append("Chamferside2:85")

scriptInput.append("DieThickness:0.0001")

scriptInput.append("DieAThickness:0.0005")

scriptInput.append("leadCount:40")

scriptInput.append("LeadLength:0.0005")

scriptInput.append("LeadWidth:0.0005")

scriptInput.append("LeadThick:0.0005")

scriptInput.append("LeadPitch:0.001")

scriptInput.append("LeadisRectangle:False")

scriptInput.append("AGUP:0.00001")

scriptInput.append("AGUPMAterial:Air-solid")

scriptInput.append("MoldMaterial:Mold_material")

scriptInput.append("WBMaterial:Au-Typical")

scriptInput.append("DieMaterial:Si-Typical")

scriptInput.append("DiePMaterial:Cu-Brass")

scriptInput.append("DieAMaterial:Die_attach_material")

scriptInput.append("LeadMaterial:Cu-Brass")

oDesign.RunToolkit("SysLib", "Geometry/Packages/QFN", [])

oDesign.RunToolkit("SysLib", "Geometry/Packages/QFN", ["ng"])

oDesign.RunToolkit("SysLib", "Geometry/Packages/QFN", scriptInput)