Electronics > Repair
Unknown SMD Inductors of a Network Switch
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2X:
Hello,
I have a PCB of a network switch "GO-SW-16G" and by mistake I ripped off two inductors when I was cleaning it. Do you know what type/characteristics/footprint must have these inductors?
fourfathom:
Do those have four pads? They look like common-mode chokes, and there are plenty of these available for ethernet use. Look at TDK and Coilcraft.
2X:
--- Quote from: fourfathom on December 26, 2024, 05:01:49 pm ---Do those have four pads? They look like common-mode chokes, and there are plenty of these available for ethernet use. Look at TDK and Coilcraft.
--- End quote ---
Yes they have four pins so as you say must be common-mode chokes. I will make a search. Thanks you very much for your reply.
fzabkar:
Does this help?
https://sfc.changhongeurope.cz/firmwares/CHIQ - L32G4000 (917A8JV)/service/L32G4000I--Circuit diagram.pdf
https://www.taobao.com/list/item/747750229891.htm
https://www.oneyac.com/product/26315608.html (WCM0805F2SF-801-N-FB)
https://patentimages.storage.googleapis.com/10/4d/a6/d68621e0177034/CN213367806U.pdf (page 5)
Essentially, the two chokes constitute a bandpass filter.
2X:
--- Quote from: fzabkar on December 26, 2024, 09:51:29 pm ---Does this help?
https://sfc.changhongeurope.cz/firmwares/CHIQ - L32G4000 (917A8JV)/service/L32G4000I--Circuit diagram.pdf
https://www.taobao.com/list/item/747750229891.htm
https://www.oneyac.com/product/26315608.html (WCM0805F2SF-801-N-FB)
https://patentimages.storage.googleapis.com/10/4d/a6/d68621e0177034/CN213367806U.pdf (page 5)
Essentially, the two chokes constitute a bandpass filter.
--- End quote ---
Thanks for your reply. The design which fits with my PCB is the blackwhite that you posted.
The only chokes that I found are the below. The one is 800 Ohm @100MHz (Replace part number: WCM 2012F2SF-801-N) like this on the attached pdf that you posted, but the other 100 Ohm @100MHz I can't find it... I fould a close value 90 Ohm @100MHz (WCM 3216F2SF-900T04). Do you beleive that this tolerance is acceptable? If you know any other site that I could find "2 LINE COMMON MODE CHOKE", please tell me.
"Original Value": YLM1206F2SF‑101‑A
WCM 3216F2SF-900T04
90 Ohms @ 100 MHz
https://www.digikey.gr/en/products/detail/tai-tech-advanced-electronics-co-ltd/WCM-3216F2SF-900T04/17835962?s=N4IgjCBcpgbFoDGUBmBDANgZwKYBoQB7KAbRAA4BmAdjAgF0CAHAFyhAGUWAnASwDsA5iAC%2BBAEzjyABgQhkkdNnxFSIAJzSABAHkAFgFssWgAJaw07QFkAEgC8QjEK3YBhQgFcmGHABMAqvy8LDooVjhoWB7cOKIEALQQ0PKomLgExJBkACzkcI4ihUA
"Original Value": YCM0805F2SF‑801‑N
WCM 2012F2SF-801-N
800 Ohms @ 100 MHz
https://www.digikey.gr/en/products/detail/tai-tech-advanced-electronics-co-ltd/WCM-2012F2SF-801-N/17835737?s=N4IgjCBcoEwwHABiqAxlAZgQwDYGcBTAGhAHsoBtEJRAAgHkALAWz1oAFaxE6BZACQBeIALokADgBcoIAMKkAruJwEAJgFUAdgEtJ9DLwJY8CgE4EQAXxIBaCNBDpI2fMTKUQAFnhgAbKMtAoA
Common Mode Chokes
https://www.digikey.gr/en/products/filter/common-mode-chokes/839
Thanks for your time and for your reply.
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