Note, when I ordered these boards under the image was the following, > The parts placement is for reference purposes only. Our engineer will review and fix the components orientation in 4-6 hours after you place the order. You can check the result in your order history. I've checked the order history and nothing shows up. Will the bridge have been correctly orientated? Mike.

Found a different datasheet that shows pins 1 & 2 as AC in.  And, spoke to JLCPCB and they assured me the part has been orientated correctly. Mike.

There is something wrong with your MB26S_C840748 PCB Footprint. This is your screenshot of the Footprint in your PCB:  This is the part in the LCSC Library:  and, for reference, in the JLCPCB Assembled Library:  This is the part in a schematic:  And this is the Footprint in a PCB:  all of which is correct to the datasheet in LCSC for that specific part: [https://datasheet\.lcsc\.com/lcsc/2009281808\_MDD（Microdiode\-Electronics）\-MB26S\_C840748\.pdf](https://datasheet.lcsc.com/lcsc/2009281808_MDD%EF%BC%88Microdiode-Electronics%EF%BC%89-MB26S_C840748.pdf)<br> <br> Note that in your footprint, the pin 1 marker is in a diagonally opposite position from the one in the library. if your Footprint is not the library Footprint called up by the Schematic Symbol then this might explain the 90 degree rotation in the PCB parts placement review.

JLCPCB told me yesterday that they had updated the footprint to agree with their datasheet. If I now place the same part on my sheet I see two completely different parts'  This really needs checking as I think the AC in is on pins 1 and 2 as per this datasheet.  It's the only datasheet I could find that had a list of pins and what they did. I'm very confused now and wonder what will arrive next week. Mike.

If you type MB26S into the search box then three show up. The other two have pins 1&2 as AC in.  Mike.

As I said above, the schematic symbol and PCB Footprint in the Library are correct to the datasheet in LCSC for that specific part: [https://datasheet\.lcsc\.com/lcsc/2009281808\_MDD（Microdiode\-Electronics）\-MB26S\_C840748\.pdf](https://datasheet.lcsc.com/lcsc/2009281808_MDD%EF%BC%88Microdiode-Electronics%EF%BC%89-MB26S_C840748.pdf)<br> <br> which as you showed in your original post, clearly shows the pin numbering and functions:  You are just confusing yourself by comparing the pin numbering of a part in a datasheet from a different OEM (original equipment manufacturer). For many components, different OEMs use different pin numbering schemes and may even adopt different physical pin ordering for what appears to be the same part type. * For info: This topic demonstrates the importance of checking **all** Symbols and Footprints, not just those listed under User Contributed. Any problems with schematic symbols or PCB Footprints should always be reported using the **Report** **Error** function. This can be accessed by selecting the part in the library and then righ-clicking. There are other ways to access this option including the More menu button in Library and others that I can't recall right now (and can't check on a smartphone). That said, as long as the pin numbers and functions on the Schematic Symbol match the pad numbers and functions on the PCB Footprint then if the connectivity in the schematic is correct  then the connectivity will be correct in the PCB. The fact that the pin numbering does not match the datasheet is confusing but not catastrophic.

I'm not sure about anything at the moment and did check the part, hence my first post to explain my confusion. The boards have now been shipped and later this week I'll find out what has happened. Whilst the diagram I posted from the JLC datasheet has numbers, it's normal to draw a part with pin 1 bottom left, which would suggest pin 1 is AC in - nor positive out. Or maybe pin 1 is top right and the little dimple indicates this. I do find it disturbing that between my first post and your reply the footprint was changed. Time will tell. Mike.

"I ... did check the part, hence my first post to explain my confusion." From my reading of your OP, "I've ordered some PCBs and have noticed a problem in the final image." it seems that you only checked the part after you submitted the board for manufacture. Sections (4) and (6) in (2) in: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a)<br> <br> describe the essential schematic and PCB checks to be made to avoid this kind of problem. Again, your concern about the pin numbering is largely irrelevant because in the OEM datasheet for the specific part you are using, the pin numbering and functionality is shown unambiguously. Your concern about the symbol and Footprint changes is relevant since others may be using the part in old designs and may be faced with unnotified Symbol or Footprint changes if they come to update them at all.