Unmarked SMD resistors

[SMTech]

@TimFox There isn't a foolproof way yet of 100% avoiding a machine load error and switching 2 parts that are used on a build is one of the easiest ones to make.

[TimFox]

Of course.  I was just commenting on how unmarked parts make troubleshooting difficult.

[SilverSolder]

I guess the main thing is to be aware that it can happen, and make sure there are fresh batteries in your LCR tweezers? 

[TimFox]

I am now.

[tszaboo]

Capacitors are already unmarked anyway.

This just makes it easier to assemble - now you don't need to think which side is up.

I hope this was a joke. Ones side has the film, the other doesnt. Heat dissipation is different based on orientation.

Your post is a joke. Heat dissipation? For caps? I mean yes it is a thing, but when was the last time you sized a cap for heat dissipation?

Also "one side has film" is not how MLCC are built.

For resistors majority of heat goes through solder joints anyway, so...

The topic is about resistors.

[ar__systems]

Capacitors are already unmarked anyway.

This just makes it easier to assemble - now you don't need to think which side is up.

I hope this was a joke. Ones side has the film, the other doesnt. Heat dissipation is different based on orientation.

Your post is a joke. Heat dissipation? For caps? I mean yes it is a thing, but when was the last time you sized a cap for heat dissipation?

Also "one side has film" is not how MLCC are built.

For resistors majority of heat goes through solder joints anyway, so...

The topic is about resistors.

And you replied to the comment about caps. Anyway, even for resistors, your comments is still invalid. RF is probably the only area where orientation of a resistor would matter.

FYI small resistors and caps are already being supplied in bulk (without tape). Not a problem.

[SilverSolder]

AOI systems can also use resistor markings for verification, when neither caps or resistors have distinguishing markings its another push towards SMT lines being fitted with component verification units that test parts to check machine loading. If you can build a complex assembly without losing track using unmarked 0402, well yay for you, I'm not going to make that claim because it would be a lie.

We do have one client that uses the marking on a resistor to designate the version of the build so we have to buy a very specific brand to make sure we get the 3 digits they want just for that location.

That's super clever, especially if the micro reads the resistor value to get the version of the board too?

[tszaboo]

Capacitors are already unmarked anyway.

This just makes it easier to assemble - now you don't need to think which side is up.

I hope this was a joke. Ones side has the film, the other doesnt. Heat dissipation is different based on orientation.

Your post is a joke. Heat dissipation? For caps? I mean yes it is a thing, but when was the last time you sized a cap for heat dissipation?

Also "one side has film" is not how MLCC are built.

For resistors majority of heat goes through solder joints anyway, so...

The topic is about resistors.

And you replied to the comment about caps. Anyway, even for resistors, your comments is still invalid. RF is probably the only area where orientation of a resistor would matter.

FYI small resistors and caps are already being supplied in bulk (without tape). Not a problem.

Yes, I'm wrong and you are right. Now here is a cat wearing a hat for you to celebrate your glorious victory in a pointless internet discussion.

[Doctorandus_P]

I once did factory repairs of stuff that failed in the field, and we had a convention to put all resistors we replaced upside down so if a product ever came back for a 2nd time it would be easily recognizable.

Long live the SMT tweezers.

I Like my Mastech MS8910, even though you need to tweak it's beaks to make them fit properly.

[Smokey]

When hand populating boards, does anyone just take 0402 (or any unmarked) resistors and install them however they fell out of the cut tape with some upside down (black side down on the board)?  For some reason I feel like I need to flip them all black side up and install them that way even through there is no value marking on either side.  Sometimes it take a few tries to flip them over with the tweezers, but I still feel like I need to do it.  Am I the only one that has this particular crazy?