S2083 MA-COM [M/A-COM Technology Solutions, Inc.], S2083 Datasheet

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S2083

Manufacturer Part Number
S2083
Description
Surface Mount Instructions for QFN / DFN Packages
Manufacturer
MA-COM [M/A-COM Technology Solutions, Inc.]
Datasheet

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Surface Mount Instructions for QFN / DFN Packages
ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions
is considering for development. Performance is based on target specifications, simulated results,
and/or prototype measurements. Commitment to develop is not guaranteed.
PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology
Solutions has under development. Performance is based on engineering tests. Specifications are
typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available.
Commitment to produce in volume is not guaranteed.
Application Note
S2083
Introduction
The layout of the surface mount board plays a
critical role in product design and must be done
properly to achieve the intended performance of an
integrated circuit. An accurate PCB pad and solder
stencil design provides a proper connection
interface between the IC package and the board.
With the correct pad geometry, the package will
self-align when subjected to a solder reflow
process and will also allow for just enough excess
surface area for adequate solder filleting.
solder mask should be applied over bare copper
(SMOBC) to avoid solder reflow under the solder
mask.
These considerations apply in general for most of
M/A-COM Tech’s surface mount packaged IC’s.
This application note provides specific guidelines
for mounting quad flat no-leads packages (QFN per
JEDEC MO-220), and dual flat no-leads packages
(DFN per JEDEC MO-229).
PCB Pad Design
The first consideration in mounting the QFN / DFN
to a board is the layout of metalized pads. The US-
based trade association, IPC, has developed land
pad design standards contained in the document
IPC-SM-782 entitled Surface Mount Design and
Land Pattern Standards.
Figures 1-1 through 1-3 shows the PCB geometry
developed for M/A-COM’s QFN / DFN packages
based on the general guidelines contained within
IPC-SM-782. The center area or the thermal pad,
acts as an RF ground pad and thermal path to
conduct heat away from the package. Normally,
the size of the thermal pad should match the size
of the exposed pad on the bottom of the package.
However, a smaller thermal pad is sometimes
recommended to prevent solder bridging to the
lead pads. Table 1 shows some suggested PCB
pad dimensions for QFN / DFN packages used by
M/A-COM Tech. The solderable length of the lead
pad is controlled by the solder mask opening (Lm)
as indicated in Table 2, in combination with pad
length (L) as indicated in Table 1.
The
M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make
changes to the product(s) or information contained herein without notice.
Via Design
To improve the thermal/RF performance of the
package, we recommend providing thermal vias on
the PCB. These vias provide a heat transfer and
RF ground path from the top surface of the PCB to
the inner layers and the bottom surface.
recommend a via diameter of 0.3 mm in a 1.0 mm
pitch array for standard square packages. This is
shown in Figure 1-1, in which the vias are 1.0 mm
away from their diagonal neighbors. Other non-
standard designs may require a slightly different via
diameter and pitch as shown in Figures 1-2, 1-3,
and 2-4.
• North America Tel: 800.366.2266 • Europe Tel: +353.21.244.6400
• India Tel: +91.80.43537383
Visit www.macomtech.com for additional data sheets and product information.
Figure 1-1 PCB Land Design
• China Tel: +86.21.2407.1588
Rev. V10
We

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S2083 Summary of contents

Page 1

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages Introduction The layout of the surface mount board plays a critical role in product design and must be done properly to achieve the intended performance of an integrated circuit. An accurate PCB pad and solder stencil design provides a proper connection interface between the IC package and the board ...

Page 2

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages X1-DFN - 6LD 1.2 x 1.5 mm PDFN - 6LD 2 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions is considering for development. Performance is based on target specifications, simulated results, and/or prototype measurements. Commitment to develop is not guaranteed. ...

Page 3

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages Figure 1-3 PCB Land Designs - cont. 1.5 x 1.2 mm PDFN - 6LD PQFN - 32LD 3 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions is considering for development. Performance is based on target specifications, simulated results, and/or prototype measurements ...

Page 4

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages Table 1. Recommended PCB Land Pattern Dimensions Package Description Package Size Type (mm) X1-DFN PDFN 1.2 x 1.5 PDFN 1.5 x 1.2 PDFN STQFN STQFN 2 x 2.5 PQFN PQFN (1.45 mm Exp. Pad) PQFN (1.7 mm Exp. Pad) ...

Page 5

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages Solder Mask Considerations The solder mask, a permanent part of most PCB’s applied after etching the metal pads, helps protect the spaces between the metal pads from solder paste and unintended adhesion of solder. ...

Page 6

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages 6 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions is considering for development. Performance is based on target specifications, simulated results, and/or prototype measurements. Commitment to develop is not guaranteed. PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology Solutions has under development ...

Page 7

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages Figure 2-3 Solder Mask Designs - cont. 7 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions is considering for development. Performance is based on target specifications, simulated results, and/or prototype measurements. Commitment to develop is not guaranteed. ...

Page 8

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages Figure 2-4 Solder Mask Design - cont. (not shown on right view for clarity) Stencil Design A stencil is used for applying solder paste to the PCB. Although the PCB design suggested in Figures 1 through 2 will help eliminate some ...

Page 9

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages 1 mm X1-DFN - 6LD 1.2 x 1.5 mm PDFN - 6LD 2 mm STQFN - 12LD 9 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions is considering for development. Performance is based on target specifications, simulated results, and/or prototype measurements. Commitment to develop is not guaranteed. ...

Page 10

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages 3 mm PQFN 4 mm PQFN 10 ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions is considering for development. Performance is based on target specifications, simulated results, and/or prototype measurements. Commitment to develop is not guaranteed. PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology Solutions has under development ...

Page 11

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages Table 2. Recommended Solder Mask & Stencil Dimensions Package type mm leads X1-DFN PDFN 1.2 x 1.5 PDFN 1.5 x 1.2 PDFN STQFN STQFN 2 x 2.5 PQFN PQFN (1.45 mm Exp. Pad PQFN (1.7 mm Exp. Pad) ...

Page 12

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages Reflow Profile The most common solder reflow method is accomplished in a belt furnace using convection heat transfer. Tables 3 thru 5 along with Figure 4 show a typical convection reflow profile of temperature versus time. The profile reflects the ...

Page 13

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages Table 3. Reflow Conditions Profile Feature Preheat/Soak Temperature Min (Ts ) min Temperature Max (Ts ) max Time (t ) from ( min max Ramp-Up Rate (T to Tp) L Liquidous temperature ( Time (t ) maintained above Peak package body temperature (Tp) Time (tp)* within 5 ° ...

Page 14

... Application Note S2083 Surface Mount Instructions for QFN / DFN Packages Table 5. Pb-Free Process - Classification Temperature (T Package Thickness <1.6 mm 1.6 mm-2.5 mm >2.5 mm Note 1: At the discretion of the device manufacturer, but not the board assembler/user, the maximum peak package body temperature (T values specified in Tables The use of a higher T Note 2: Package volume excludes external terminals (e ...

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