+ Post New Thread
Results 1 to 6 of 6
  1. #1
    Banned
    Points: 8,487, Level: 22
    Achievements:
    7 years registered

    Join Date
    Jun 2008
    Posts
    1,180
    Helped
    37 / 37
    Points
    8,487
    Level
    22

    Rooting PCB tracks under surface mount inductor is OK?

    hello,

    do you think its ok to root pcb tracks under this sepic inductor?
    (i.e. go between the pads on the same side of the board as the inductor is mounted on.)

    -or wll the track be shorted by the underside of the inductor?

    MSD7342 SEPIC INDUCTOR DATASHEET:
    http://www.coilcraft.com/pdfs/msd7342.pdf

    •   AltAdvertisement

        
       

  2. #2
    Advanced Member level 5
    Points: 33,613, Level: 44
    ckshivaram's Avatar
    Join Date
    Apr 2008
    Location
    villingen (Germany) / Bangalore
    Posts
    5,070
    Helped
    2158 / 2158
    Points
    33,613
    Level
    44
    Blog Entries
    1

    Re: Rooting PCB tracks under surface mount inductor is OK?

    Not recommended at all.. you should not run tracks below few things....
    1. Inductors
    2. Power transistors
    3. Regulators (SMD)
    4. Crystal oscliiators etc
    " It is so simple to be happy,
    but it is so difficult to be simple"



    •   AltAdvertisement

        
       

  3. #3
    Banned
    Points: 8,487, Level: 22
    Achievements:
    7 years registered

    Join Date
    Jun 2008
    Posts
    1,180
    Helped
    37 / 37
    Points
    8,487
    Level
    22

    Re: Rooting PCB tracks under surface mount inductor is OK?

    hi

    in the case of this inductor , is the potential problem due to shorting of the track to the inductor, or due to noise pick-up from the inductor?



    •   AltAdvertisement

        
       

  4. #4
    Advanced Member level 5
    Points: 33,613, Level: 44
    ckshivaram's Avatar
    Join Date
    Apr 2008
    Location
    villingen (Germany) / Bangalore
    Posts
    5,070
    Helped
    2158 / 2158
    Points
    33,613
    Level
    44
    Blog Entries
    1

    Re: Rooting PCB tracks under surface mount inductor is OK?

    noise pick up,,, and there are some chances of short when inductor goes faulty, and un-noticed
    " It is so simple to be happy,
    but it is so difficult to be simple"



  5. #5
    Advanced Member level 1
    Points: 6,219, Level: 18

    Join Date
    Mar 2002
    Location
    UK
    Posts
    487
    Helped
    110 / 110
    Points
    6,219
    Level
    18

    Re: Rooting PCB tracks under surface mount inductor is OK?

    Notice that the ferrit body is conductive so the voltage applied between the coil of the inductor and the track under the inductor will be applied on the insulation of the inductor wire and the solder mask. The solder mask thickness can vary but it's usually thinner on narrow tracks (due to cappiliar effects). The wire insulation is also quite thin and can't widstand big voltages. Like result if the track is under the inductor it becomes critical the voltage between this track and the inductor wire



    •   AltAdvertisement

        
       

  6. #6
    Newbie level 6
    Points: 542, Level: 4

    Join Date
    Mar 2010
    Location
    Philippines
    Posts
    11
    Helped
    2 / 2
    Points
    542
    Level
    4

    Re: Rooting PCB tracks under surface mount inductor is OK?

    normally you should not do this. But if you can consult with the circuit designer and you are absolutely sure that the voltages involved are within safe limits, then it can be a case-to-case basis.


    1 members found this post helpful.

--[[ ]]--