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How to design a CMC (Common Mode Choke) footprint to allow no-pop solution

Should I keep the decoupling capacitor's vias isolated from ground fills?How to use common mode choke inductors? (differential vs common mode)selection of common mode chokeSMPS PCB Design Signal IntegrityCommon mode choke vs individual inductors for offline flyback smpscommon mode choke on DC lineknow the parameter of common mode choke for power adaptercommon mode choke - symbol and orientationCommon mode choke selection for 5V 1A smps power supplyPCB Layout - Common Mode Choke

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1

$begingroup$

How would you design in CMC's with a 0504 (1210 metric) 4-lead package to allow for a no populate (do not pop, DNP,DNI) solution? I am thinking 0402 0ohm (zero ohm) resistor but cannot picture the PCB layout?

Specifcally, this is for USB data lines and the CMC's may be used to reduce radiated EMI.

pcb pcb-design inductor layout common-mode-choke

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asked 9 hours ago

RuggedEngieRuggedEngie

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add a comment | 

1

$begingroup$

How would you design in CMC's with a 0504 (1210 metric) 4-lead package to allow for a no populate (do not pop, DNP,DNI) solution? I am thinking 0402 0ohm (zero ohm) resistor but cannot picture the PCB layout?

Specifcally, this is for USB data lines and the CMC's may be used to reduce radiated EMI.

pcb pcb-design inductor layout common-mode-choke

share|improve this question

asked 9 hours ago

RuggedEngieRuggedEngie

611 bronze badge

New contributor

RuggedEngie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

add a comment | 

$begingroup$

How would you design in CMC's with a 0504 (1210 metric) 4-lead package to allow for a no populate (do not pop, DNP,DNI) solution? I am thinking 0402 0ohm (zero ohm) resistor but cannot picture the PCB layout?

Specifcally, this is for USB data lines and the CMC's may be used to reduce radiated EMI.

pcb pcb-design inductor layout common-mode-choke

share|improve this question

asked 9 hours ago

RuggedEngieRuggedEngie

611 bronze badge

New contributor

RuggedEngie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|improve this question

asked 9 hours ago

RuggedEngieRuggedEngie

611 bronze badge

New contributor

RuggedEngie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 9 hours ago

RuggedEngieRuggedEngie

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New contributor

RuggedEngie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 9 hours ago

RuggedEngieRuggedEngie

611 bronze badge

New contributor

RuggedEngie is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 9 hours ago

RuggedEngieRuggedEngie

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2 Answers
2

active

oldest

votes

4

$begingroup$

In these situations for prototyping I do something like this:

You cut the traces on the PCB if you need to install the choke. That way you don't impedance problems from soldering wires. The problem with this setup is once you cut the PCB traces, you can't go back. Another way to do this would be to put 0 ohm resistors in series with the choke. Or you could use 0 ohm resistors if you select them the same size as the choke gap.

share|improve this answer

edited 8 hours ago

answered 8 hours ago

laptop2dlaptop2d

33.5k1212 gold badges4040 silver badges100100 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  You can always go back with cut traces. With a suitable ECN and solder bridge
  $endgroup$
  – Sunnyskyguy EE75
  8 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  In my case the thermal EMF would not be the same, when I cut, it's one way.
  $endgroup$
  – laptop2d
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  In our shops where I worked, it was neat but bridgeable. It is always a better idea to include CM chokes for USB. I have seen too many data errors without this using Towers to Arduino on floating supplies etc. Due to SMPS CM noise.
  $endgroup$
  – Sunnyskyguy EE75
  8 hours ago
  
  
  

  
  
  
  

add a comment | 

1

$begingroup$

It would be a dual pad layout joined for either SMD CM choke or any SMD 0R parts or fixed R parts depending on design.

The design would be controlled impedance for USB2 (100MHz) or USB 3.

share|improve this answer

answered 8 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

79k22 gold badges3030 silver badges114114 bronze badges

$endgroup$

add a comment | 

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4

$begingroup$

In these situations for prototyping I do something like this:

You cut the traces on the PCB if you need to install the choke. That way you don't impedance problems from soldering wires. The problem with this setup is once you cut the PCB traces, you can't go back. Another way to do this would be to put 0 ohm resistors in series with the choke. Or you could use 0 ohm resistors if you select them the same size as the choke gap.

share|improve this answer

edited 8 hours ago

answered 8 hours ago

laptop2dlaptop2d

33.5k1212 gold badges4040 silver badges100100 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  You can always go back with cut traces. With a suitable ECN and solder bridge
  $endgroup$
  – Sunnyskyguy EE75
  8 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  In my case the thermal EMF would not be the same, when I cut, it's one way.
  $endgroup$
  – laptop2d
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  In our shops where I worked, it was neat but bridgeable. It is always a better idea to include CM chokes for USB. I have seen too many data errors without this using Towers to Arduino on floating supplies etc. Due to SMPS CM noise.
  $endgroup$
  – Sunnyskyguy EE75
  8 hours ago
  
  
  

  
  
  
  

add a comment | 

4

$begingroup$

In these situations for prototyping I do something like this:

You cut the traces on the PCB if you need to install the choke. That way you don't impedance problems from soldering wires. The problem with this setup is once you cut the PCB traces, you can't go back. Another way to do this would be to put 0 ohm resistors in series with the choke. Or you could use 0 ohm resistors if you select them the same size as the choke gap.

share|improve this answer

edited 8 hours ago

answered 8 hours ago

laptop2dlaptop2d

33.5k1212 gold badges4040 silver badges100100 bronze badges

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  You can always go back with cut traces. With a suitable ECN and solder bridge
  $endgroup$
  – Sunnyskyguy EE75
  8 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  In my case the thermal EMF would not be the same, when I cut, it's one way.
  $endgroup$
  – laptop2d
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  In our shops where I worked, it was neat but bridgeable. It is always a better idea to include CM chokes for USB. I have seen too many data errors without this using Towers to Arduino on floating supplies etc. Due to SMPS CM noise.
  $endgroup$
  – Sunnyskyguy EE75
  8 hours ago
  
  
  

  
  
  
  

add a comment | 

$begingroup$

In these situations for prototyping I do something like this:

You cut the traces on the PCB if you need to install the choke. That way you don't impedance problems from soldering wires. The problem with this setup is once you cut the PCB traces, you can't go back. Another way to do this would be to put 0 ohm resistors in series with the choke. Or you could use 0 ohm resistors if you select them the same size as the choke gap.

share|improve this answer

edited 8 hours ago

answered 8 hours ago

laptop2dlaptop2d

33.5k1212 gold badges4040 silver badges100100 bronze badges

$endgroup$

share|improve this answer

edited 8 hours ago

answered 8 hours ago

laptop2dlaptop2d

33.5k1212 gold badges4040 silver badges100100 bronze badges

answered 8 hours ago

laptop2dlaptop2d

33.5k1212 gold badges4040 silver badges100100 bronze badges

answered 8 hours ago

laptop2dlaptop2d

33.5k1212 gold badges4040 silver badges100100 bronze badges

1

$begingroup$

It would be a dual pad layout joined for either SMD CM choke or any SMD 0R parts or fixed R parts depending on design.

The design would be controlled impedance for USB2 (100MHz) or USB 3.

share|improve this answer

answered 8 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

79k22 gold badges3030 silver badges114114 bronze badges

$endgroup$

add a comment | 

1

$begingroup$

It would be a dual pad layout joined for either SMD CM choke or any SMD 0R parts or fixed R parts depending on design.

The design would be controlled impedance for USB2 (100MHz) or USB 3.

share|improve this answer

answered 8 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

79k22 gold badges3030 silver badges114114 bronze badges

$endgroup$

add a comment | 

$begingroup$

It would be a dual pad layout joined for either SMD CM choke or any SMD 0R parts or fixed R parts depending on design.

The design would be controlled impedance for USB2 (100MHz) or USB 3.

share|improve this answer

answered 8 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

79k22 gold badges3030 silver badges114114 bronze badges

$endgroup$

share|improve this answer

answered 8 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

79k22 gold badges3030 silver badges114114 bronze badges

answered 8 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

79k22 gold badges3030 silver badges114114 bronze badges

answered 8 hours ago

Sunnyskyguy EE75Sunnyskyguy EE75

79k22 gold badges3030 silver badges114114 bronze badges