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The Knowledge and Know-how Connection
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May 24, 2013
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Views: 4022
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Anode Cathode pin1 these should not be a issue. There are rules for thru hole and you can carry them over to SMT. As in when learning about thru hole Diodes you learn a saying Cathy lives at the bar, meaning the bar shown on the Diode is the Cathode. When building this part I always make the cathode pin one. SMT or thru hole. The parts 0 orientation always matches the tape and reel. This is not rocket since but it does take formal requirements to be followed. Keep your standard rules and you should always be placed correctly.
Dave Pavone
I'm currently chairman of the Automated Component Handling Committee of the ECA/EIA, and we publish the EIA-481 standard for carrier tape. This issue of non-standard or no-standard marking for polarity or Pin 1 location has caused nothing but headaches for us.
We've done our best to establish standard rules for component orientation in tape, but our efforts have been hampered by the inconsistent markings by manufacturers and legacy orientation practices dating to the beginnings of SMT. Would one of you, Jim or Phil, be willing to contribute your thoughts on this matter to our committee?
Scott Carter, Tek Pak, Inc., US