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How many EEs know this basic thing?

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ebastler:
@terrance -- I see you are new to the forum. When you reply to a post which is a few messages back in the thread, it is advised to use the "Quote" link in that post, rather than the "Reply" link.

This will automatically insert a quoted copy of the post you are replying to, allowing readers to understand which message you are referring to. And it avoids the impression that you are mumbling to yourself in a long series of posts...  ::)

Sensorcat:

--- Quote from: Gyro on May 09, 2024, 11:41:15 am ---The thread title and post read as if the OP has just read their first datasheet and made a 'discovery'.

--- End quote ---

As a supervisor of students doing their 1st larger project, you can see the traces of these discoveries in their reports. When they focus on something not worth mentioning for an entire page, it's a 'discovery'.

DavidAlfa:

--- Quote from: terrance on May 08, 2024, 09:28:44 pm ---A device can't reach multiple maximum ratings at the same time, and ratings have their conditions.

--- End quote ---
This question is at Arduino hobbyst level, copy&paste, magic happens.
I guess it's your first steps in design so pretty understandable, there's a vast land out there!

It's the Pmax and Tjmax what limits the operation area.

A typical regulator won't be able to cope with more than 0.5-1W just naked, it will overheat.

If you're able to keep it chill with a proper cooling method, you still have to take care of Pmax, the heat the package can transfer to the outside world is not infinite, past this it will overheat internally, even if you attach it to the Eiffel tower during freezing winter.

Berni:

--- Quote from: terrance on May 09, 2024, 09:43:44 pm ---didn't I mention 'Reaching "MULTIPLE" maximum ratings' ?

--- End quote ---

Yes, it is normal for all of the rating in the "Operating conditions" to apply simultaneously (Unless specifically mentioned in the note to apply under some specific conditions)

You can reach up to the maximum on any of those specs, as long as you don't also exceed the any other specs. This is because not every circuit designer will be running the device under the same conditions. Some need a LDO to drop 30V to 5V, some only do 6V to 5V. It doesn't make sense to limit the designer who only needs to drop 1V to the current to the current of a 30V drop.


This is the same as buying a car with the following specs:
Top speed: 210 km/h
Towing capacity: 1400 kg

Then hitching up a 1000 kg trailer to the car and flooring it up a 15% grade hill. Yet the car only managed to get to 110km/h despite flooring it all the way and not even being at max towing capacity. Does that mean the top speed of 210km/h is bullshit? Why would they sell you a car that claims to do 210km/h if it can't do it in all conditions? Such a rip off.  :-DD

pdenisowski:

--- Quote from: Berni on May 10, 2024, 08:07:07 am ---This is the same as buying a car with the following specs:
Top speed: 210 km/h
Towing capacity: 1400 kg

--- End quote ---

 :-DD  That's a fantastic example - thanks!!!

(Although I'm going to have to change it to mph and pounds / tons before I can share it with my friends and coworkers)

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