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AMC1400: recommendation mounting on the PCB for AMC1400 and AMC1411

Part Number: AMC1400
Other Parts Discussed in Thread: AMC1411,

Hi Team,

I am looking for a replacement for the ACNT-H79B (Optical Isolation Amplifier) for 1500V working voltage with Reinforced Isolation.
I came across the AMC1400 and AMC1411.
Is there a recommendation for mounting on the PCB to achieve a clearance of ≥ 14.7 mm and creepage of ≥ 15.1?

Thank you in advance. 

Beat Regards,

Martin

  • Hi Martin!

    Comparing the AMC1400/AMC1411 datasheet land patterns to the device you mentioned, you can get slightly more clearance with our recommended layout.  Looking at our land pattern example for optimized clearance and creepage, you are right at 14.6mm.  You could push the pad centers out another 0.1mm but you would want to clear that with your PCB manufacturer/assembly house to ensure they have accurate registration and chip placement   Have you already implemented a slot on your board to get greater than 15.1 mm of creepage?

  • Hi Tom,

    Thank you very much for your answer.
    We wanted to implement a slot on the PCB, but we still have the problem that the creepage can run from the PCB to the outer casing of the IC and then back to the PCB.
    According to the standard we use (EN 50178 / EN 60664-1) we have to create at least 1mm air gap.
    The only way I can see is to position the air gap directly under the legs of the IC. But then the solder wires would have to be pulled back further.

  • Hi Martin,

    Grooves are usually cut through the PCB directly between the two sides (i.e. the middle of the chip body).  Are your safety folks telling you something different?  Also, the chip itself is going to limit the creepage, which is measured around the ends of the but or across the body from high to low side.

  • Hi Tom,
    the groove is no longer set centrally in our company, as this does not really reduce the creepage distance according to the standard (our company's interpretation).

  • OK - I see, you are trying to use the 'space' from the pad foot to the IC body to maintain that 1mm creepage/clearance.  PCB wise, there are not a lot of options.  Conformal coating helps in some situations, but that can also be tough to guarantee from run to run of PCBs.  What is the end application here?  

  • Hi Tom,
    the application would be measuring equipment for various converter systems and test benches (industry).

  • Hi Martin,

    Would something like this work for you?