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  #1  
Old 04-13-2012, 09:09 PM
Dritech Dritech is offline
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Default Irf630

Hi,

What is the voltage drop between the drain and the collector of the IRF630??

I cannot see this specification listed in the datasheet.
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Old 04-13-2012, 09:32 PM
k7elp60 k7elp60 is offline
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I think you mean the drain and the source, as the drain is like a collector of a transistor. The difference is dependant on the drain current times the Rds(On resistance) This depends upon the gate to source voltage. The Rds is typically 0.25ohms.
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Old 04-13-2012, 09:32 PM
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MrChips MrChips is offline
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IRF630 is a power MOSFET, not a bipolar junction transistor.
There is no collector, only gate, drain and source.
The drain-source ON resistance is 0.4 ohm max.
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Old 04-13-2012, 09:34 PM
paulktreg paulktreg is offline
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I don't think you will find it quoted?

It does however have a RDS(on) resistance of 0.35R. If you know how much current is flowing through the device then Ohms Law will give you the voltage across it.

or is this too simplistic?

Hope that helps.
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Old 04-13-2012, 09:55 PM
Dritech Dritech is offline
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Hi, thanks for the replies. Why the TIP122 and similar transistors have the 'Collector-Emitter Saturation Voltage' listed while the MOSFETs do not have?
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Old 04-14-2012, 06:58 PM
Dritech Dritech is offline
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So if the current flowwing through a MOSFET with an RDS(on) resistance of 0.35R, is voltage drop is 0.35*2A = 0.7V. Is that how to determine the voltage drop?
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Old 04-14-2012, 07:04 PM
paulktreg paulktreg is offline
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There are a few manufacturers of the IRF630 with different quoted values for RDS(on) so check that first but your calculation sounds right to me.
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