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Old 27th December 2005, 06:29 PM   #1
AndrewT is offline AndrewT  Scotland
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Question Lateral FET and Rds on?

Vertical FETs quote an "Rds on" figure in the datasheets.
This puts another SOAR boundary into the low voltage area of the curve.

Does a Lateral FET have a similar Rds on value?
I cannot find one for 2sj162/k1058
My circuit needs an Rds on value below 1.5ohms to keep the IV on the right (safe) side.
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Old 27th December 2005, 06:55 PM   #2
lineup is offline lineup  Sweden
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I have no idea why no Rds is given for lateral mosfets.

Can we try to make up a value?
From figure is 6 A at Vds=5 Volt

Gives R = 0.8 Ohm
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Old 27th December 2005, 07:05 PM   #3
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Rds(on) for Hitachi 50/56/135/176 was around 1.5 Ohms.

For lower capacitance Lateral Mosfets Rds(on) is a lot higher.
Benefit of vertical fets: much higher capacitance but really low Rds(on) values.
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