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I have a project where I need a small coupled inductor for isolated low baudrate communication. The line is short and I don't really care if only half of signal goes through.

I need it really cheap, below $0.10 at 10k quantities. Problem is, coupled inductors don't really fit in my budget.

So I've found this common mode choke, presumably used to filter high speed communication lines:

DLM0NSM900HY2

My application requires isolation of at least 80V. I am looking at the the specs of this choke and it is not clear what voltage it will hold, and what inductance I should expect.

Can someone comment on that?

datasheet

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    \$\begingroup\$ How about the lines that say 'Rated Voltage 5 V', and 'Withstanding Voltage 12.5 V' ? \$\endgroup\$
    – Neil_UK
    Commented Sep 8, 2022 at 11:15
  • \$\begingroup\$ What is the minimum inductance you can work with? \$\endgroup\$
    – Jens
    Commented Sep 8, 2022 at 13:29

1 Answer 1

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My application requires isolation of at least 80V. I am looking at the the specs of this choke and it is not clear what voltage it will hold, and what inductance I should expect.

Can someone comment on that?

The data sheet says that the withstand voltage is a measly 12.5 volts: -

enter image description here

So I thought I'd better dig a little deeper and look to see how they test that: -

enter image description here

And, it is what it is so, if you want an isolation capability of 80 volts I'd definitely look for a better alternative. Given that it is nowhere near your requirement it's pointless trying to figure out its inductance.

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  • \$\begingroup\$ Yes I saw those specs and could not believe it is only 12V. I thought it may be some kind of noise amplitude or whatever. But looks like it really is 12V. Any ideas on what inductance it may have? Or if I can calculate it somehow from other specs, without buying and measuring. \$\endgroup\$
    – elektrinis
    Commented Sep 8, 2022 at 12:44
  • \$\begingroup\$ It's pointless trying to figure it out if it can't handle the voltage. \$\endgroup\$
    – Andy aka
    Commented Sep 8, 2022 at 12:52
  • \$\begingroup\$ not really, as this, similar choke can withstand 125V. eu.mouser.com/ProductDetail/Panasonic/… Any chance of knowing inductance without ordering and waiting? I'd need 10-50uH. Edit: frequency and impedance is given for this one, so I'll figure it out. Thanks. \$\endgroup\$
    – elektrinis
    Commented Sep 8, 2022 at 14:53
  • \$\begingroup\$ At least it has graphs but, I estimate it to be around 150 nH and much lower than what you want I suspect. \$\endgroup\$
    – Andy aka
    Commented Sep 8, 2022 at 15:31

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