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MOSFET to replace a relay

Rajinder

Jan 30, 2016
568
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Jan 30, 2016
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568
Hi,
I need to replace a relay with a MOSFET. The relays have very low contact rating is 30milli ohm. I need to switch low value resistors typically 0.2R.

I am measuring currents in the 2uA range, so can't afford that to be affected.
The relays are controlled from a PIC micro. Is there any MOSFET I could use?
Best regards,
Raj
 

Minder

Apr 24, 2015
3,484
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Apr 24, 2015
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3,484
Look in the IR IRL series, the IRLZ44S for e.g. is 28milli ohm.
logic gate.
Max
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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If the voltage is low, there are many options. Some as low as single digit milliohms.

For such low currents I cant see the resistance being a huge issue. Are you really concerned with nanovolt differences in voltage?
 
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