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QFN MMIC Package: QFN_EM

Symbol

Summary

QFN_EM is a QFN MMIC package model. You can specify the number of leads, lead pitch, overmolding, the method of singulation, materials and other package parameters and properties.

This element is for use in 3D EM documents only. It is intended to create a 3D parameterized cell for quad-flat no-leads (QFN) for 3D EM analysis. See “Using 3D EM Elements ” for details on using 3D pCells with Cadence® AWR® Analyst™ 3D FEM EM analysis software.

Topology

Parameters

Name Description Unit Type Default
ID Element ID Text IC
QX Package X size (for reference only) Length 5 mm
QY Package Y size (for reference only) Length 5 mm
NLX Number of X side leads   5
NLY Number of Y side leads   5
SLX Lead pitch on X side Length 0.65 mm
SLY Lead pitch on Y side Length 0.65 mm
WL Lead width Length 0.3 mm
LL Lead Length Length 0.8 mm
TL Lead and die pad metal thickness Length 0.2 mm
TLW Width of lead T-extension Length 0.5 mm
TLL length of lead T-extension Length 0.4 mm
G Distance between lead and die pad Length 0.2 mm
PX Die pad X size Length 3 mm
PY Die pad Y size Length 3 mm
HM Overmold (package) height Length 0.9 mm
TMA Thickness of package walls (air cavity with lead option) Length 0.9 mm
TLA Thickness of package lid (air cavity with lead option) Length 0.9 mm
RhoL Leadframe metal bulk resistivity relative to gold   0.7
RhoLD Package lead metal bulk resistivity relative to gold   1.1
ErP Relative dielectric constant of overmold dielectric   4
TandP Loss tangent of overmold dielectric   0.001
ErLD Relative dielectric constant of lid dielectric   4.6
TandLD Loss tangent of lid dielectric   0.0037
LJ Length of corner jumper Length 0.6 mm
WJ Width of corner jumper Length 0.3 mm
EXANG Angle of punch press excision Angle 0
METL_NAME Leadframe metal name for 3D EM cell Text Copper
METL_NAME Package lid metal name for 3D EM cell Text Aluminum
OMOLD_NAME Overmold dielectric name for 3D EM cell Text OMold
LIDD_NAME Lid dielectric name for 3D EM cell Text Glass
TestPack Switch Full package/Lidframe only Text Lidframe only
Singul Singulation method switch Saw/Punch Text Saw
AirCav Switch No air cavity/Air cavity with lid/Air cavity w/o lid Text No air cavity
LidMtr Switch Dielectric lid/Metal lid Text Dielectric lid

Parameter Details

QX, QY. Parameters QX and QY specify overall package dimensions and are only for reference. Pcell calculates the actual dimensions from other parameters:

Qx = Px + 2LL + 2G

Qy = Py + 2LL + 2G

Layout

The layout for this cell has hard-coded model layers. When you first use this layout cell, a layer named "QFNPACK" is added to your drawing layer and model layer list (if they are not already there). Using the model layer mapping, you can assign these layers to draw on any drawing layer.

3D EM Layout

This element has a layout cell specifically for Analyst 3D EM layouts. See “Using 3D EM Elements ” for details on using 3D pCells with Analyst software.

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