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Connector Orientation
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jalsop 2 years ago
I want to use LCSC p/n C424689 on a custom PCB.  The datasheet is here: [https://datasheet\.lcsc\.com/lcsc/2111031430\_DIBO\-DB128V\-5\-0\-15P\-GN\-S\_C424689\.pdf](https://datasheet.lcsc.com/lcsc/2111031430_DIBO-DB128V-5-0-15P-GN-S_C424689.pdf)<br> <br> This is a screw terminal block with 15 positions. Maybe I'm missing something obvious, but, I am unable to figure out from the datasheet which side of the connector has the openings to insert the wires. I need this component to be oriented correctly, so if anyone can help me figure it out, I would greatly appreciate  it! Thanks in advance!
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andyfierman 2 years ago
You need to: 1) Understand that the datasheet is drawn using the 3rd angle projection as described in detail in: [https://en\.m\.wikipedia\.org/wiki/Multiview\_orthographic\_projection\#:\~:text=Third%2Dangle%20projection%3A%20In%20this\,the%20observer%20and%20the%20object](https://en.m.wikipedia.org/wiki/Multiview_orthographic_projection#:~:text=Third%2Dangle%20projection%3A%20In%20this,the%20observer%20and%20the%20object). and therefore that the wire entry holes shown in the "front" view are on the lower face in the "top" view. 2) Note that the pair of little trapezium shaped locking lugs are are on the left hand side as you look into the wire entry holes. 3) The PCB Footprint should clearly identify either the wire entry face or the locking lugs or both.
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jalsop 2 years ago
Thanks Andy, The PCB footprint looks like this: ![Screen Shot 2022-12-20 at 10.44.06 AM.png](//image.easyeda.com/pullimage/bZLY8FsowmflNlk3XUHgQA05FFhfyi1CSX4u5hhr.png) Do the little "boxes" on the upper side represent the wire entry face?  The locking lugs are not shown. If that is the case, then (looking at the top view from the datasheet), the locking lugs look like they would be at the right side of the entry face, not the left.![Screen Shot 2022-12-20 at 10.47.02 AM.png](//image.easyeda.com/pullimage/zSIz3RLzKDVBUzBfmnR1PN7nDN6z8xXRXHChGHcU.png) Thanks very much for your help!
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jalsop 2 years ago
Also, looking at the image from LCSC: ![Screen Shot 2022-12-20 at 10.52.11 AM.png](//image.easyeda.com/pullimage/5XANf1iNP0BUkjkDEc3BEreeJPgVhxANTMgpC223.png) If those are the wire entry holes, then the lugs are at the right, assuming you are looking at the wire entry face with the connector mounted on the PCB. Thanks!
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andyfierman 2 years ago
These things really are badly drawn and illustrated. I believe that the photo urls are labelled incorrectly. Your image shows the slots in the back of the connector: ![image.png](//image.easyeda.com/pullimage/HAnswGaOPDMvEKrrAnIfW7ZNZyxCoNnekBPx2eYo.png) whereas these are the wire entry points on the front: ![image.png](//image.easyeda.com/pullimage/NU0acHFNyk5qDnYXd9a4UdNv2NFSfHBaFhi1vA9K.png) Look at the middle image in: [https://datasheet\.lcsc\.com/lcsc/2111031430\_DIBO\-DB128V\-5\-0\-15P\-GN\-S\_C424689\.pdf](https://datasheet.lcsc.com/lcsc/2111031430_DIBO-DB128V-5-0-15P-GN-S_C424689.pdf)<br> <br> which shows the wire entry face as in the datasheet: [https://assets\.lcsc\.com/images/lcsc/900x900/20190919\_DIBO\-DB128V\-5\-0\-15P\-GN\-S\_C424689\_back\.jpg](https://assets.lcsc.com/images/lcsc/900x900/20190919_DIBO-DB128V-5-0-15P-GN-S_C424689_back.jpg)<br> <br> ![image.png](//image.easyeda.com/pullimage/Gs97guN57TJiLaQqYdCshvre0MvJuST7YRXbf7Si.png) And note the ledge over the upper part of the wire entry points whereas the back face is one angled face. Also look carefully at the PCB Footprint and how it shows the locking lugs on the left hand edge: ![image.png](//image.easyeda.com/pullimage/jbTTyVF2Dp6wbNZrJfoWlYgdTx4zGItneUU94S5p.png) Here's a similar type of connector I tried to draw more clearly but even then, looking back on it I'm not sure it helps that much! ![image.png](//image.easyeda.com/pullimage/rRohXUyakYA06jKmVdMiECRKJrCPjNXOHUtvPqjl.png) It doesn't help that I don't think this particular datasheet is drawn in 3rd angle projection!! [https://en.maritex.com.pl/product/attachment/33409/tb5002xs.pdf](https://en.maritex.com.pl/product/attachment/33409/tb5002xs.pdf)
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andyfierman 2 years ago
I think the slots at the back are some sort of crude test point access.
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jalsop 2 years ago
@andyfierman Thanks very much Andy - I've got it now. Your effort and attention to detail for such a minor request (that is probably of no interest to anyone but me) is truly remarkable! Thanks again...
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andyfierman 2 years ago
@jalsop, Thanks. :)
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