SI7478DP_09 Datasheet, PDF (8/12 Pages) Vishay Siliconix – N-Channel 60-V (D-S) MOSFET

AN821
Vishay Siliconix
PowerPAK SO-8 DUAL
The pin arrangement (drain, source, gate pins) and the
pin dimensions of the PowerPAK SO-8 dual are the
same as standard SO-8 dual devices. Therefore, the
PowerPAK device connection pads match directly to
those of the SO-8. As in the single-channel package,
the only exception is the extended drain connection
area. Manufacturers can likewise take immediate
advantage of the PowerPAK SO-8 dual devices by
mounting them to existing SO-8 dual land patterns.
To take the advantage of the dual PowerPAK SO-8’s
thermal performance, the minimum recommended
land pattern can be found in Application Note 826,
Recommended Minimum Pad Patterns With Outline
Drawing Access for Vishay Siliconix MOSFETs. Click
on the PowerPAK 1212-8 dual in the index of this doc-
ument.
The gap between the two drain pads is 24 mils. This
matches the spacing of the two drain pads on the Pow-
erPAK SO-8 dual package.
REFLOW SOLDERING
Vishay Siliconix surface-mount packages meet solder
reflow reliability requirements. Devices are subjected
to solder reflow as a test preconditioning and are then
reliability-tested using temperature cycle, bias humid-
ity, HAST, or pressure pot. The solder reflow tempera-
ture profile used, and the temperatures and time
duration, are shown in Figures 3 and 4.
For the lead (Pb)-free solder profile, see http://
www.vishay.com/doc?73257.
Ramp-Up Rate
Temperature at 155 ± 15 °C
Temperature Above 180 °C
Maximum Temperature
Time at Maximum Temperature
Ramp-Down Rate
+ 6 °C /Second Maximum
120 Seconds Maximum
70 - 180 Seconds
240 + 5/- 0 °C
20 - 40 Seconds
+ 6 °C/Second Maximum
Figure 3. Solder Reflow Temperature Profile
140 - 170 °C
3 °C(max)
210 - 220 °C
3 °C(max)
10 s (max)
183 °C
60 s (min)
Pre-Heating Zone
50 s (max)
Reflow Zone
Maximum peak temperature at 240 °C is allowed.
4 °C/s (max)
Figure 3. Solder Reflow Temperatures and Time Durations
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Document Number 71622
28-Feb-06