![]() ![]() There's a lack of synerization there.Īs you have found out the hard way in paying tuition for that lesson. Well S.B., welcome to the wide and wonderful world of surface mount technology and electronic manufacturing in general, because whether we're talking about LEDs, QFPs, QFNs, even PLCCs, SOICs, there is no standard marking for denoting Pin 1 on active components, I mean ICs, and certainly on polarized components. Needless to say, I was confused.Īll right, well, where to begin. Based on the data sheet from each LED, the polarity mark denotes the anode on one LED and the cathode on the other LED. I look at all the information and cannot understand why. In circuit test says one LED is backwards on every PCB. There were no questions with the assembly with regards to LED orientation during visual and automated inspection, until ICT. ![]() They've been building equipment for a while and have not had a problem, but they're building a board that had two different color LEDs on it. They sent us a very detailed explanation, and I'll just summarize it for you. Must the mark be visible from the top, etc.? Is there some standard that governs the polarity marks which are used to denote the orientation of an SMT LED component, PCB silkscreen, and on assembly drawings? Examples, cathode or anode in the case of an LED, Pin 1 in an IC. We're here to talk about processes and components and materials and surface mount, and all kinds of other exciting things that our listeners send into us. This is Phil Zarrow and Jim Hall of ITM Consulting coming to you from ITM intergalactic headquarters here on Mount Rialto in New Hampshire. He is a pioneer in the science of reflow. He has vast experience in SMT equipment, materials and processes.Ī Lean Six-Sigma Master Blackbelt, Jim has a wealth of knowledge in soldering, thermal technology, equipment and process basics. With over 35 years experience in PCB assembly, Phil is one of the leading experts in SMT process failure analysis. Process Troubleshooting, Failure Analysis, Process Audits, Process Set-upĬEM Selection/Qualification, SMT Training/Seminars, Legal Disputes Is there a standard that governs how polarity marks are used to denote orientation of components on circuit boards?īoard Talk Board Talk is presented by Phil Zarrow and Jim Hall of ITM Consulting. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video.Īre There Standards Governing Polarity Marks? ![]()
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