If i want to use any IC forexample IRFZ44N in any arduino project ,what are the important points that we should look for in datasheet of IRFZ44N since usually datasheets are typically having more than 5 pages information and it may not be easy to understand what information is useful and important to us.
These 1 page summary data sheets are the important ratings.
Basically a FET data sheet is somewhat different from others, in that they try and maximise all parameters. Which in reality should be taken with a big pinch of salt. Often thermal characteristic will prevent all the maximums being achieved at the same time.
One of the more important ones is the resistance when on. This is called the Rds(on). Now it is not so much this figure but the conditions it is measured under. Here you will see it is for a gate voltage of 10V. This means it is not a logic level FET which means you can't connect it directly to the 5V signal of an Arduino output and expect it to work.
Do not confuse the gate threshold with how much it takes to turn it on. This is how low the gate voltage has to be in order for the FET to be off.
Compare the IRFZ44n datasheet and the IRLZ44n datasheet.
Find the "Static Drain to Source On resistance" in the table.
You will find that only the "L" version has it listed at 5volt, and even at 4volt.
Leo..
ALL are useful and important, otherwise the manufacturer wouldn't care to determine them! It depends on the application which one you need.
@LarryD I'm getting a 403 "forbidden" on that link?
A few weeks back, this web site started doing this to links.
Try the link now
it works. Thanks Larry
Actually a data sheet would be useless unless you understand the terms and what they are telling you. What does Rds(on) saying. It is telling you the Resistance from the Drain to Source when Enhanced (turned on) with a given voltage from the Gate to the Source. With that knowing your load and Vgs voltage you can determine what the voltage drop will be at a given load at a given temperature. From that you can look at thermal information and determine how hot it will get and if you need to add a heat sink. Remember electronics is a big trade off game. For example a cooler MOSFET for your load you need a lower Rds(on), that would normally cost more money. You could also achieve the same result with a heat sink... When referencing MOSFETs your voltage reference is always the source.
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