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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Marlies Hanf


coplanarity | 15 December, 1999

Hi. Can someone explain to me what coplanarity is? There are a few rather irritating and contradictory definitions of that term. When leads are coplanar - what are they then? Are they parallel to each other or not?

Thanks, Marlies

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Chris May


Re: coplanarity | 15 December, 1999


The IPC definition, which I think we can trust, says that Coplanarity is defined as lying or acting in the same plane. In other words Coplanarity means no bent legs, pins.



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Re: coplanarity | 15 December, 1999

CoPlanarity also applies to height.

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Calvin Wong


Re: coplanarity | 16 December, 1999

Coplanarity also takes into consideration which is your reference plane. In the case of connectors, you can consider coplanarity between the highest and the lowest lead. Also, you can consider all the connector leads with reference to the connector body.



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Alvin Kevichusa


Re: coplanarity | 17 December, 1999

Let's look at it this way... Imagine a multileaded component sitting on a flat surface. If all the leads touch the flat surface, they are all in the same plane (that of the flat surface) and are coplanar. Coplanarity is desirable because if a lead is higher than others, the reflowed solder may not be enough to join the lead to the pad, creating an open circuit.

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