Power switching with transistor

Heath's picture

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Joined: Sep 27, 2021

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Power switching with transistor
September 27, 2021 - 12:43am

Hey everyone,

I thought this was a beginner forum, I'm very much a beginner and I have a very basic question. I need to switch a max of 2A @ 6Vdc and thought I would need a jfet based on my understanding, but I haven't been able to sort through the filters on the digikey site. I thought I could narrow it down by the case type, find a case type for the mounting style then power range and go from there. On digikey, they jump from mA to 35A and really high voltages. I can't find any pages on the google box that corrilate case type with power, which I thought was the main basis for different cases. Could someone suggest the correct filters or maybe an actual transistor?

very much appreciated 

Sourav Gupta's picture

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Joined: Feb 12, 2018

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What is the switching load? Is it inductive? Resistive?

Heath's picture

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Joined: Sep 27, 2021

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Hi Sourav,

it's going to control power to a servo, so while the micro controller is idle (which will be weeks at a time) i can power it down and it's not going to try and hold position. so it's 5V DC with a stall current of 1800ma. the micro output to the gate is up to 5V.

Heath

Sourav Gupta's picture

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Joined: Feb 12, 2018

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You can use 5A mosfets with low rds on resistance. THere are many in digikey.

Heath's picture

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Joined: Sep 27, 2021

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 Thanks Sourav,

What is rds?. sorry, i really don't know much about this.