Author Topic: High Density Sub-D as SMT?  (Read 714 times)

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Offline BreakingOhmsLawTopic starter

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High Density Sub-D as SMT?
« on: April 10, 2022, 07:59:44 pm »
Does anyone know of a SMT version of Sub-D high-densitiy (three rows) connectors?
The standard through-hole variants have such tight dimensions, that I am not able to route traces between the holes. I'd need an 8-layer board just to break the signals free from the connector.

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Offline David_AVD

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Re: High Density Sub-D as SMT?
« Reply #1 on: April 10, 2022, 09:08:09 pm »
You can get those connectors with only two rows on the PCB side. Yes, still three rows on the interface side. :)

I had to get a through hole one to repair a motherboard with a broken VGA connector. There might be an SMD version too.

The one I got was from Mouser.
 

Offline TassiloH

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Re: High Density Sub-D as SMT?
« Reply #2 on: April 11, 2022, 08:31:47 am »
Check the hole/drill diameter. I have seen datasheets recommending more than generous 1.3mm drills for these connectors. Others recommend less (Wuerth says 1mm, but pin diameter is 0.65mm). I just looked at an old design of mine with an HD44 connector, the symbol I have used there has 0.82mm drill size/0.254mm restring and the connector fitted just fine. This gives plenty of space to route between pins (see picture). I would suggest to get one of the connectors and measure the pin diameter to be sure.
 
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Online oPossum

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Re: High Density Sub-D as SMT?
« Reply #3 on: April 11, 2022, 08:51:19 am »
Using 0.9mm drill and 1.4mm pad allows enough room for traces.

 
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Offline BreakingOhmsLawTopic starter

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Re: High Density Sub-D as SMT?
« Reply #4 on: April 11, 2022, 08:03:57 pm »
I redesigned the footprint and it worked just fine. Thanks for the suggestions.

I'm puzzled why Amphenol supplies a footprint that is practically unusable. :-/O
 


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