Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


part orientation

Views: 2531

#55257

part orientation | 26 June, 2008

I'm building a circuit board by hand and can't identify pin 1 on a smt IC. I always determine this by the beveled edge, which this part has, but it also has an arrow on the opposite end, so now I'm unsure which one I should go by...help!

Ok, got my answer..the arrow on the part is analong inc's trademark, not a polarity marker - which is a little confusing to the user, I must say!

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#55265

part orientation | 26 June, 2008

Lots of times the suppliers define pin on with a mark on the part molding. Often, they define their approach on their data sheet.

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#55269

part orientation | 27 June, 2008

Not these days. Most parts have several molding marks. Or the entire edge has a bevel. Using the ink as polarity is becoming mainstream.

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#55272

part orientation | 27 June, 2008

I have lots of those parts don't go by the arrow it is a vender marking has nothing to do with the polarity go by the belveled edge you can't go wrong

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#55273

part orientation | 27 June, 2008

Yup on the confusing thing. My manual assembly guy made the same mistake and we burned up a little batch of their parts back around 2001 or so.

Jon

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#55280

part orientation | 28 June, 2008

Wouldn't it be nice if all components and packaging were standardized. Some ignaramous that has never done any production work is designing the component and has not a clue what it is like in the real world of manufacturing. Is there an answer to the madness?

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#55281

part orientation | 28 June, 2008

I've been saying that for years. Polarity markings shouldn't have to be a guessing game. You really wonder what some of these manufacturers are thinking. It COULD and should be made simpler!

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#55282

part orientation | 28 June, 2008

It just baffles me as to why a vendor would use, of all things, an arrow as a trademark in the first place. Then stick it on the oppossite side of another marker to boot! I swear, sometimes the way some parts are marked, it's like the manufacterer is purposely messing with you just for kicks - haha. I'm just glad I caught this one, I haven't always been so lucky, though. Another poster on here said packaging and marking should be standardized, I couldn't agree more. This shouldn't have to be a guessing game.

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#55292

part orientation | 30 June, 2008

Intel uses the dot in their letter "i". Hmmm, go figure.

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