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SIR472ADP Datasheet(PDF) 8 Page - Vishay Siliconix

Part # SIR472ADP
Description  N-Channel 30 V (D-S) MOSFET
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Manufacturer  VISHAY [Vishay Siliconix]
Direct Link  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SIR472ADP Datasheet(HTML) 8 Page - Vishay Siliconix

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VI SHAY SILICO NIX
Power MOSFETs
Application Note AN821
PowerPAK® SO-8 Mounting and Thermal Considerations
Revision: 16-Mai-13
1
Document Number: 71622
For technical questions, contact: powermosfettechsupport@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
www.vishay.com
by Wharton McDaniel
MOSFETs for switching applications are now available with
die on resistances around 1 m
 and with the capability to
handle 85 A. While these die capabilities represent a major
advance over what was available just a few years ago, it is
important for power MOSFET packaging technology to keep
pace. It should be obvious that degradation of a high
performance die by the package is undesirable. PowerPAK
is a new package technology that addresses these issues.
In this application note, PowerPAK’s construction is
described. Following this mounting information is presented
including land patterns and soldering profiles for maximum
reliability. Finally, thermal and electrical performance is
discussed.
THE PowerPAK PACKAGE
The PowerPAK package was developed around the SO-8
package (figure 1). The PowerPAK SO-8 utilizes the same
footprint and the same pin-outs as the standard SO-8. This
allows PowerPAK to be substituted directly for a standard
SO-8 package. Being a leadless package, PowerPAK SO-8
utilizes the entire SO-8 footprint, freeing space normally
occupied by the leads, and thus allowing it to hold a larger
die than a standard SO-8. In fact, this larger die is slightly
larger than a full sized DPAK die. The bottom of the die
attach pad is exposed for the purpose of providing a direct,
low resistance thermal path to the substrate the device is
mounted on. Finally, the package height is lower than the
standard
SO-8,
making
it
an
excellent
choice
for
applications with space constraints.
Fig. 1
PowerPAK 1212 Devices
PowerPAK SO-8 SINGLE MOUNTING
The PowerPAK single is simple to use. The pin arrangement
(drain, source, gate pins) and the pin dimensions are the
same as standard SO-8 devices (see figure 2). Therefore, the
PowerPAK connection pads match directly to those of the
SO-8. The only difference is the extended drain connection
area. To take immediate advantage of the PowerPAK SO-8
single devices, they can be mounted to existing SO-8 land
patterns.
Fig. 2
The minimum land pattern recommended to take full
advantage of the PowerPAK thermal performance see
Application
Note 826, Recommended Minimum Pad
Patterns With Outline Drawing Access for Vishay Siliconix
MOSFETs. Click on the PowerPAK SO-8 single in the index
of this document.
In this figure, the drain land pattern is given to make full
contact to the drain pad on the PowerPAK package.
This land pattern can be extended to the left, right, and top
of the drawn pattern. This extension will serve to increase
the heat dissipation by decreasing the thermal resistance
from the foot of the PowerPAK to the PC board and
therefore to the ambient. Note that increasing the drain land
area beyond a certain point will yield little decrease
in foot-to-board and foot-to-ambient thermal resistance.
Under specific conditions of board configuration, copper
weight and layer stack, experiments have found that
more than about 0.25 in2 to 0.5 in2 of additional copper
(in addition to the drain land) will yield little improvement in
thermal performance.
Standard SO-8
PowerPAK SO-8


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