ADuM144X creepage distance

We have a problem with one of your isolators ADuM1447 where from the datasheets package drawing the cheepage distance for the part is 5.6mm (enaugh for our purpose) but in the VDE report its stated 5.3mm (does not comply to standard in our case). Where is the error in your datasheet or in VDE report?

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  • Yes the creepage was determined via the datasheets package drawing using the least favorable distances and we came to 5.6mm, also when measuring the package itself.  As the package has thickness also. But we did not think of the floating metal tie bar. The 5.1mm specification in datsheet was overseen. We have taken the material group II into account. As no other product is so low power as the ADuM1447 conformal coating is the only solution to the problem to Achieve pollution degree 1 and so smaller creepage distances. Does Analog devices recommend a coating or did you tested some? In The datasheet there is mentioned the device is rated up to max working voltage of 849V reinforced insulation per VDE, this is probably with conformal coating applied?

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  • Yes the creepage was determined via the datasheets package drawing using the least favorable distances and we came to 5.6mm, also when measuring the package itself.  As the package has thickness also. But we did not think of the floating metal tie bar. The 5.1mm specification in datsheet was overseen. We have taken the material group II into account. As no other product is so low power as the ADuM1447 conformal coating is the only solution to the problem to Achieve pollution degree 1 and so smaller creepage distances. Does Analog devices recommend a coating or did you tested some? In The datasheet there is mentioned the device is rated up to max working voltage of 849V reinforced insulation per VDE, this is probably with conformal coating applied?

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