Right Angle Header Differences

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Cube Central

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Apr 17, 2018, 2:46:30 PM4/17/18
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Hi All,
I wanted to point out a potential "gotcha" when dealing with Right Angle Headers as they are used extensively with the RC2014.
I had ordered some from Mouser, and since I hadn't done that before for this part, I didn't have a definitive part number.

Number 1:  The part [ 571-4-103323-1 ] from Mouser: https://www.mouser.com/ProductDetail/571-4-103323-1
Number 2:  The header included as part of an official RC2014 board
Number 3:  A mystery source spares part I had in my header bin


You can see that on #1 the plastic is "before" the right angle bend.  On #2 the plastic is "after".  On #3 the straight part (to the left) is shorter than it is on #1.


I haven't tried out #1 with an RC2014 board, but I think it would "stick up" higher out of the female header on the RC2014 motherboard.  

As an aside, it looks like the BoM for Ed Brindley's YM/AY Sound Card PCB for the RC2014 Computer (and potentially his other boards ) point to the #1 type of Right Angle Header and not the same sort that is included in official RC2014 kits.
I see a DigiKey part referenced:  https://www.digikey.com/products/en?keywords=732-5350-ND   and it appears to be the #1 type.  Seen here. And also OctoPart for the sound card.
Please correct me if I'm wrong here, as I am new to tools like Octopart and could be looking at it totally wrong.  The blame is squarely on me and I don't blame Ed Brindley at all as I had no idea that there were different versions of this type of part.

Take a peek in your spares and see if you find different ones!  If anyone would like me to measure I would be glad to post a follow-up.

I will be looking to replace #1 with some #2 so if anyone has a correct (Mouser) part number or source I would be very grateful!!

    -Randal   (at CubeCentral)

djrm

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Apr 17, 2018, 3:12:28 PM4/17/18
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Hi, I noticed this myself just last week when I ordered some more of these for myself. Another potential mistake is that pin spacing of 0.1 inch (2.54mm) is needed, I nearly ordered some at 2mm spacing by mistake, they look very similar in photos. Better quality will be gold plated too. hth David.

Ed Brindley

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Apr 17, 2018, 3:34:52 PM4/17/18
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Hi Randal,

Totally agree, that header isn't right at all. Many apologies that the BOM isn't correct.

The ones I am using myself were bought from here: https://www.toby.co.uk/board-to-board-pcb-connectors/254mm-headers/ths-valcon-254mm-right-angle-48mm-profile-pin-header/ but they are a bit of a niche UK supplier!

2.54mm Pitch 4.8mm Up-angle PCB Mount Pin Headers

THS-40-R-RA

These are very similar to the RC2014 provided ones, with the plastic flush to the PCB side.

Hopefully you might be able to find similar from a US supplier?

Cheers,
Ed


CubeCentral

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Apr 17, 2018, 4:02:34 PM4/17/18
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All,
I just spent some time online with a Mouser technician and she was unable to find the right angle header specified as #2 in the drawings. All of the ones that came up in our searches were like the #1 type. I will continue to search, maybe DigiKey has some that are different.

-Randal (at CubeCentral)
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AstroBob

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Apr 17, 2018, 4:16:27 PM4/17/18
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A quite satisfactory right angle header is the 61304011021  (710-61304011021 Mouser part number) from Wurth Electronics. It is a 40 pin connector with the plastic away from the board solder side. That is the part number that I have used in the BOM spreadsheet. See:

AstroBob

Marco Maccaferri

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Apr 17, 2018, 4:17:32 PM4/17/18
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Il 17/04/2018 20:46, Cube Central ha scritto:

> You can see that on *#1* the plastic is "before" the right angle
> bend. On *#2* the plastic is "after". On *#3* the straight part (to
> the left) is *shorter* than it is on *#1*.
>
> I haven't tried out #1 with an RC2014 board, but I think it would
> "stick up" higher out of the female header on the RC2014
> motherboard.

Yes, that type makes the board a little higher on the connector, but
another thing you may want to consider is if you need to add boards
using the double row header to connect the extended bus on the pro
backplane. With the first type all boards are nicely aligned, with the
"standard" type you have some boards narrower than others and components
may touch the nearby board if not correctly placed (like taller
electrolytic capacitors).

For what is worth, I'm using this from Digi-Key S1112EC-40-ND for my
boards. I don't understand why they are so hard to find at reasonable
prices.

Best regards,
Marco.

CubeCentral

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Apr 17, 2018, 4:29:47 PM4/17/18
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AstroBob,

I did look at that Mouser part, and it suffers the same differences as I noted in the original post.

https://www.mouser.com/datasheet/2/445/6130xx11021-538004.pdf

One can see that the plastic is on the other side of the bend.

…the search continues.

 

    -Randal   (at CubeCentral)

 

 

From: rc201...@googlegroups.com [mailto:rc201...@googlegroups.com] On Behalf Of AstroBob
Sent: Tuesday, April 17, 2018 14:16
To: RC2014-Z80 <rc201...@googlegroups.com>

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CubeCentral

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Apr 17, 2018, 4:31:33 PM4/17/18
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Marco,
I looked into that Digi-Key part number and found the same problem.
https://media.digikey.com/PDF/Data%20Sheets/Sullins%20PDFs/zzzCzzzSzzN-M71RC,%2011637-B.pdf
Unless the drawing is not to be believed?

-Randal (at CubeCentral)


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AstroBob

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Apr 17, 2018, 5:01:34 PM4/17/18
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Randal,
Yes, I understand, however, when you mix both single row headers like ones that Spencer provides for a board and the double row headers for the Pro Only connections, it s better to use your example 1 versus example 2 that you shown in your photos.  When I built my Pro setup, I had single row pins that look very similar to your mystery connectors (I got mine from Adafruit.com) instead of pulling the pins from the double row connectors as Spenser shows in the assembly documentation.   I could not use the single row pins with the double row pins as they will not line up (different pin to board spacing).  All my boards have a consistent height and worked well together.

AstroBob

CubeCentral

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Apr 17, 2018, 7:02:53 PM4/17/18
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All, I’ve linked a previous conversation about just this issue, not being able to find the headers, but I ended up following the information in the link and bought a bunch off AliExpress.  I think they’re right, at least it looks right in the photo.

https://groups.google.com/d/msg/rc2014-z80/1ePlb_DVPJs/9obycGgxAwAJ

Cheers!

 

                -Randal   (at CubeCentral)

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prefo...@gmail.com

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Apr 21, 2018, 10:15:18 AM4/21/18
to RC2014-Z80
Will this one from Sparkfun work? https://www.sparkfun.com/products/12792 ?
Thanks.

CubeCentral

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Apr 21, 2018, 11:47:38 AM4/21/18
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Those are the dual headers.  I was pointing out the differences in single headers I had found. 

Now I’m worried that not all “Right Angle Dual Male Headers” are the same either and will have to see what different ones I can find in my spares bins.

So far, I’ve just used the “official” ones from Spencer, and a few I found in a variety kit I had handy.

 

I don’t think the layout works if you use two separate right-angle headers, and the ones you linked to from Mouser are “40P” which, as far as I understand, are “40 position” headers, which is one more than the 39 the RC2014 boards require.

 

Hope that helps…

 

    -Randal   (at CubeCentral)

 

 

From: rc201...@googlegroups.com [mailto:rc201...@googlegroups.com] On Behalf Of prefo...@gmail.com
Sent: Saturday, April 21, 2018 08:15
To: RC2014-Z80 <rc201...@googlegroups.com>
Subject: [rc2014-z80] Re: Right Angle Header Differences

 

Will this one from Sparkfun work? https://www.sparkfun.com/products/12792 ?

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