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AN804

Part Number	AN804
Manufacturer	Vishay Siliconix
Description	P-Channel MOSFET
Published	Mar 26, 2005
Detailed Description	AN804 Vishay Siliconix P-Channel MOSFETs, the Best Choice for High-Side Switching Historically, p-channel FETs were no...
Datasheet	AN804 PDF File

Overview

AN804 Vishay Siliconix P-Channel MOSFETs, the Best Choice for High-Side Switching Historically, p-channel FETs were not considered as useful as their n-channel counterparts.
The higher resistivity of p-type silicon, resulting from its lower carrier mobility, put it at a disadvantage compared to n-type silicon.
Getting n-type performance out of p-type FETs has meant larger area geometries with correspondingly higher inter-electrode capacitances.
Consequently, a truly complementary pair—a p-channel and an n-channel device that match in all parameters—is impossible.
Yet, despite its shortcomings, the p-channel MOSFET performs a vital “high-side” switch task that the n-channel simply cannot eq...

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