Pen to mark IC chips

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#1
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Hi,

I need some type of easy way to mark chips, some type of pen perhaps. Any suggestions.

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With a previous company I worked for they had some sort of permanent marker that marked stuff with white print.

our chinese factory does it with a pensil, you can hardly see it , but it is very clear when you have the right light circumstance.

how clear does the marking have to be?
and what are the numbers (one or 2 or multple hundreds)

an alternative would be to use nail paint (not sure if it is called that) 'Borrow' a bottle from the wife/girlfriend to try.

If I recall correctly the previous company used this:

http://nl.farnell.com/edding/8010-049/marker-x-ray-wht/dp/8762627?Ntt=x-ray+marker

regards

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marking should be clear, the end customer will see the markings to tell them what firmware is on the chip.

Thanks for the link, I just bought one off ebay. Farnell molests me on shipping to canada.

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You should also have a look at metron optics website. They make marker pens including UV ink based markers.
http://www.metronusa.com/

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Paint markers also work pretty well on these surfaces.
http://www.sharpie.com/enus/pages/oil-based-paint-marker.aspx

Can find at stationary and art/craft stores.
Not sure how permanent.

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I use "sticky dots". They are paper circles with adhesive on the back. They come in packs, with many dots on a no-stick backing.

Write on the dot with ordinary pen. Peel the dot off the backing with a knife and stick it to the top of the MCU.

Easy to do, and relatively little mess. They are available at most large office supply stores. In the US, that means Office Max, Staples, and such. Also many smaller office supply stores - they are very common. And, they come in a variety of colors.

Jim

 

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+1 for the paper stickons.

Ross McKenzie ValuSoft Melbourne Australia

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I've used white-out pens in the past. They normally are a little clumpy, so you have to write bigger than normal. But otherwise they work ok on many surfaces.

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Take a look at this page:
http://www.grainger.com/product/...

There are a few styles on the page below the primary advert.

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Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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re-reading, I would also go for the sticky dots in this case.

then when you update the firmware all you need to do is to put a new sticker on top of the existing one and you are done.

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Just an update, I got the marker suggested by meslomp. Works pretty well, my only fear is that the liquid is pretty thick and I may run out of ink in only a short time.

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When my tea is running low, I pour myself a new cup.

A different approach might be to use different coloured raddle crayons. You can scan the 'patients' at a later date.

David.

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The Sharpie metallic ink pens are good for writing on dark surfaces like wall warts. The tip is fairly blunt though. You couldn't write much on a small chip.

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Edding sells refill ink for some of their pens. Buy in bulk.

Related, lots of different specialzed marking pens available. http://www.markingpendepot.com/

-carl