What is EIA 481 standard is all about?

i need to knw the difference bet EIA 481 B standard %26amp; EIA 481 C standard. Tq

What is EIA 481 standard is all about?
The 481C is being revised at this time due to broad window of tape strength, parts orientation, some still use 481B standard and results in polarity issues,what constitutes a square and determining a standard for placement of a square part and defining "top" of that part to cure the polarity issue.





Comes down to they want to take pics to adopt a standard for part placement. Problem is these particular items are not specifications, but standards in the industry. Blah-Blah-Blah.





The big shots will have their meetings and happy hours and a 481D revision will be out in another 2 years and I expect it to be even more detailed
Reply:"The current revision of EIA 481 Rev C has been updated to define tape and


reel orientation for a wider range of SMT devices; however this has created


a conflict with the original orientation definitions for tantalum chip and


multilayer ceramic chip capacitors.


Tantalum chip capacitors will retain "right handed" reeling (parts across


the tape with positive termination AWAY from the sprocket hole) as


previously defined in tape and reel revision EIA-481-1 and component


specifications EIA-535BAAC (Standard) and EIA-535BAAE (Low ESR) series.


MLC capacitors will not adopt the new orientation; for the various case size


options please refer to current manufacturer’s data sheets for correct


orientation.


Both tantalum and MLC capacitor orientation will be updated in the next


revision of EIA 481"
Reply:This Standard was formulated to provide dimensions and tolerances necessary to tape surface mount components such that they may be automatically handled.