Filter connectors...

P

Phil Hobbs

Guest
Feedthrough caps have gotten stupid expensive, like $15 per pin. There
are D sub connectors with built-in capacitance of up to about 47 nF, and

I seem to recall seeing ferrite plates whose holes matched the D-sub
pattern, but can\'t find them. A 9-pin one would be great.

What do you folks use for EMI filtering on connectors?

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
onsdag den 5. januar 2022 kl. 20.43.48 UTC+1 skrev Phil Hobbs:
> Feedthrough caps have gotten stupid expensive, like $15 per pin.

https://www.surplussales.com/FEEDTHRUS/FTHOLEMNT3.HTML ?
https://www.alibaba.com/product-detail/M3-1000PF-Feedthrough-Capacitor_60409523377.html
https://de.aliexpress.com/item/1542421201.html

There
are D sub connectors with built-in capacitance of up to about 47 nF, and

I seem to recall seeing ferrite plates whose holes matched the D-sub
pattern, but can\'t find them. A 9-pin one would be great.
Click to expand...

https://www.digikey.at/en/products/detail/fair-rite-products-corp/2644236101/8593849 ?
 
On Wed, 5 Jan 2022 14:43:36 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

Feedthrough caps have gotten stupid expensive, like $15 per pin. There
are D sub connectors with built-in capacitance of up to about 47 nF, and

I seem to recall seeing ferrite plates whose holes matched the D-sub
pattern, but can\'t find them. A 9-pin one would be great.
Click to expand...

Hi, Phil:-

Fair-Rite 2644236101 looks like what you want. Laird also may have
something.
What do you folks use for EMI filtering on connectors?
Click to expand...

Feedthrough PI filters are very expensive but work nicely.

You can get military style connectors with some filtering built in,
not cheap.

Cheers

Phil Hobbs
Click to expand...
--
Best regards,
Spehro Pefhany
 
On Wed, 05 Jan 2022 15:23:40 -0500, Spehro Pefhany
<speffSNIP@interlogDOTyou.knowwhat> wrote:

On Wed, 5 Jan 2022 14:43:36 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Feedthrough caps have gotten stupid expensive, like $15 per pin. There
are D sub connectors with built-in capacitance of up to about 47 nF, and

I seem to recall seeing ferrite plates whose holes matched the D-sub
pattern, but can\'t find them. A 9-pin one would be great.

Hi, Phil:-

Fair-Rite 2644236101 looks like what you want. Laird also may have
something.

What do you folks use for EMI filtering on connectors?

Feedthrough PI filters are very expensive but work nicely.

You can get military style connectors with some filtering built in,
not cheap.

Cheers

Phil Hobbs
Click to expand...

There are gender-changer-looking sorts of filter things that plug into
a d-sub.

--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon
 
Am 05.01.22 um 20:43 schrieb Phil Hobbs:
Feedthrough caps have gotten stupid expensive, like $15 per pin.  There
are D sub connectors with built-in capacitance of up to about 47 nF, and

I seem to recall seeing ferrite plates whose holes matched the D-sub
pattern, but can\'t find them.  A 9-pin one would be great.

What do you folks use for EMI filtering on connectors?
Click to expand...

<
https://www.digikey.de/de/products/detail/tusonix-a-subsidiary-of-cts-electronic-components/2499-003-X5W0-502PLF/3116039
>

I have bought this one 1.5 years ago for € 6.
I found that not exactly cheap for a ~M4 bolt with a
tube capacitor inside.

Now it is € 21. But it was €27 2 weeks ago when a customer
wanted to buy them for the series. :-(

I\'m looking myself for something smaller and cheaper.

cheers, Gerhard
 
Gerhard Hoffmann wrote:
Am 05.01.22 um 20:43 schrieb Phil Hobbs:
Feedthrough caps have gotten stupid expensive, like $15 per pin.
There are D sub connectors with built-in capacitance of up to about 47
nF, and

I seem to recall seeing ferrite plates whose holes matched the D-sub
pattern, but can\'t find them.  A 9-pin one would be great.

What do you folks use for EMI filtering on connectors?



https://www.digikey.de/de/products/detail/tusonix-a-subsidiary-of-cts-electronic-components/2499-003-X5W0-502PLF/3116039
 

I have bought this one 1.5 years ago for € 6.
I found that not exactly cheap for a ~M4 bolt with a
tube capacitor inside.

Now it is € 21. But it was €27 2 weeks ago when a customer
wanted to buy them for the series.  :-(

I\'m looking myself for something smaller and cheaper.

cheers, Gerhard
Click to expand...

Thanks, all, that Fair-Rite part was what I was thinking of. Forty
cents for 9 isolators is about the right price.

Turns out that Tusonix sells some pretty nice solder-in and threaded
feedthroughs for a buck or so--see RF-microwave.com.

Cheers

Phil

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On Wed, 5 Jan 2022 18:21:29 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

Gerhard Hoffmann wrote:
Am 05.01.22 um 20:43 schrieb Phil Hobbs:
Feedthrough caps have gotten stupid expensive, like $15 per pin.
There are D sub connectors with built-in capacitance of up to about 47
nF, and

I seem to recall seeing ferrite plates whose holes matched the D-sub
pattern, but can\'t find them.  A 9-pin one would be great.

What do you folks use for EMI filtering on connectors?



https://www.digikey.de/de/products/detail/tusonix-a-subsidiary-of-cts-electronic-components/2499-003-X5W0-502PLF/3116039
 

I have bought this one 1.5 years ago for € 6.
I found that not exactly cheap for a ~M4 bolt with a
tube capacitor inside.

Now it is € 21. But it was €27 2 weeks ago when a customer
wanted to buy them for the series.  :-(

I\'m looking myself for something smaller and cheaper.

cheers, Gerhard

Thanks, all, that Fair-Rite part was what I was thinking of. Forty
cents for 9 isolators is about the right price.

Turns out that Tusonix sells some pretty nice solder-in and threaded
feedthroughs for a buck or so--see RF-microwave.com.

Cheers

Phil
Click to expand...

So many RF boxes use these things for power input. You have to solder
a wire outside onto the feedthru or something awkward like that. It\'s
barbaric. Even tubes plugged into sockets.



--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon
 
John Larkin wrote:
On Wed, 5 Jan 2022 18:21:29 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Gerhard Hoffmann wrote:
Am 05.01.22 um 20:43 schrieb Phil Hobbs:
Feedthrough caps have gotten stupid expensive, like $15 per pin.
There are D sub connectors with built-in capacitance of up to about 47
nF, and

I seem to recall seeing ferrite plates whose holes matched the D-sub
pattern, but can\'t find them.  A 9-pin one would be great.

What do you folks use for EMI filtering on connectors?



https://www.digikey.de/de/products/detail/tusonix-a-subsidiary-of-cts-electronic-components/2499-003-X5W0-502PLF/3116039
 

I have bought this one 1.5 years ago for € 6.
I found that not exactly cheap for a ~M4 bolt with a
tube capacitor inside.

Now it is € 21. But it was €27 2 weeks ago when a customer
wanted to buy them for the series.  :-(

I\'m looking myself for something smaller and cheaper.

cheers, Gerhard

Thanks, all, that Fair-Rite part was what I was thinking of. Forty
cents for 9 isolators is about the right price.

Turns out that Tusonix sells some pretty nice solder-in and threaded
feedthroughs for a buck or so--see RF-microwave.com.


So many RF boxes use these things for power input. You have to solder
a wire outside onto the feedthru or something awkward like that. It\'s
barbaric. Even tubes plugged into sockets.
Click to expand...

I hear you. But we do a lot of proof-of-concept demos for licensed
design-in solutions. Having stuff on the shelf that we can bolt
together with no signal integrity worries is a huge win.

Once they get onto the customer\'s board, the signal integrity worries
are much less serious--cap multipliers and board-level shields are
better than good enough.

Cheers

Phil Hobbs


--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com
 
On 06/01/2022 07:23, Spehro Pefhany wrote:
On Wed, 5 Jan 2022 14:43:36 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Feedthrough caps have gotten stupid expensive, like $15 per pin. There
are D sub connectors with built-in capacitance of up to about 47 nF, and

I seem to recall seeing ferrite plates whose holes matched the D-sub
pattern, but can\'t find them. A 9-pin one would be great.

Hi, Phil:-

Fair-Rite 2644236101 looks like what you want. Laird also may have
something.
Click to expand...

They mention high resistivity, but I couldn\'t see how conductive that
material is. Hopefully not very.
 
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