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AN1703 Datasheet(PDF) 3 Page - STMicroelectronics

Part # AN1703
Description  GUIDELINES FOR USING ST?셎 MOSFET SMD PACKAGES
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1703 Datasheet(HTML) 3 Page - STMicroelectronics

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AN1703 - APPLICATION NOTE
3/22
What we now have to compute is the TJ value since TC is also an input data related to ambient or case
temperature. To detect the arising junction temperature (TJ), we look at the variation of the forward drop
of the drain-source diode, since this variation is proportional to the change in junction temperature.
3. D2PAK
The D2PAK is a surface mounting version of the standard TO-220 package, with the lead formed and the
tab removed. It has been designed to achieve the high quality and reliability levels required by end users
in the automotive industry.
Figure 2 shows D2PAK and its recommended footprint:
Figure 2: D2PAK and its recommended footprint (all dimensions are in mm)
Figure 3 shows a graph of RTHJ-PCB versus drain pad area from minimum recommended footprint to
10cm2:
Figure 3: RTHJ-PCB versus drain pad area for D
2PAK
30
35
40
45
50
55
60
65
0
100
200
300
400
500
600
700
800
900 1000
FR-4, 2 oz copper board
Minimum recommended footprint
R
THJ-A


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