USB-B jack with common mode choke?

[Joerg]

Gents,

Does anyone remember a manufacturer that makes through-hole USB-B jacks
with common mode chokes in there? Preferably with a metal flap that can
also be grounded against a front panel.

Came upon a situation where they didn't place CM chokes on the board,
trying to see if it can be remedied sans relayout.

 

[Oppie]

Gents,

Does anyone remember a manufacturer that makes through-hole USB-B jacks
with common mode chokes in there? Preferably with a metal flap that can
also be grounded against a front panel.

Came upon a situation where they didn't place CM chokes on the board,
trying to see if it can be remedied sans relayout.

I had just been using a ferrite bead and passing the USB D- and D+ lines
both through it.

 

[Joerg]

I had just been using a ferrite bead and passing the USB D- and D+ lines
both through it.

Looks very tight in our case but that's an idea. Maybe we can find a
really flat bead.

 

[Robert Lacoste]

Gents,

Does anyone remember a manufacturer that makes through-hole USB-B jacks
with common mode chokes in there? Preferably with a metal flap that can
also be grounded against a front panel.

Came upon a situation where they didn't place CM chokes on the board,
trying to see if it can be remedied sans relayout.

Hi Joerg,

You can also use the same solution that the trick used in plenty of, well,
east-designed products : ship it with a USB cable with a built-in ferrite
bead on the device side. That way the "product" is the cable+device kit, and
your EMC certification will pass without problem. Of course your customer
may have issue if he use another USB cable, but that's no longer your
problem ;+)

Friendly yours,
Robert Lacoste
www.alciom;com

 

[Joerg]

Hi Joerg,

You can also use the same solution that the trick used in plenty of, well,
east-designed products : ship it with a USB cable with a built-in ferrite
bead on the device side. That way the "product" is the cable+device kit, and
your EMC certification will pass without problem. Of course your customer
may have issue if he use another USB cable, but that's no longer your
problem ;+)

A big ferrite over the whole cable isn't helping, just a tiny ferrite
over only D+ and D- (together, or course) is what helps. Haven't found
any cable that has those. If anyone knows a source I am all ears.