Looking for a 3.5mm Pitch Terminal Block Plug - Page 1
Forum section: electronics / projects

author: Ventran
author_rank: Contributor
timestamp: January 10, 2025, 09:49:27 pm
content: I am trying to find a terminal block plug with a 3.5mm pitch in 2-pin and 3-pin configurations.Currently, I use system:Plug:DORABO DB2EK-3.5-2P-BK-STerminal:DORABO DB2ERC-3.5-2P-BKHowever, I need a plug that is rotated 180 degrees, with the wire mounting screws positioned on the top side. This is important because I mount the terminal blocks (sockets) on the bottom side of the PCB.The attached image illustrates my current setup. I would like the screws on the plugs on the upper PCB to align in orientation with the plugs on the lower PCB when the device is assembled in its enclosure.What is this type of plug called? What search terms or categories should I use to locate such a solution?Thank you in advance for your guidance!

author: ajb
author_rank: Super Contributor
timestamp: January 10, 2025, 10:43:34 pm
content: Those are generally just called "pluggable screw terminals". Wurth has 90° versions (what they call horizontal) in both orientations, but not the style you have there. Phoenix Contact would be worth checking, they have some unusual variants on these connectors, but it can be a pain to find them on their website.Is there no way to mount the board the other way in the enclosure? Or you could look for an upside-down PCB header that takes the same plugs, that way all of the plugs can be the same.

author: Ventran
author_rank: Contributor
timestamp: January 11, 2025, 05:48:39 pm
content: @ajb, could you provide the part number for the Würth component you're referring to? I'd like to look it up.

author: BennoG
author_rank: Frequent Contributor
timestamp: January 11, 2025, 09:01:31 pm
content: be aware that there are 3.5 and 3.81 mm plugs in use.For a 2 pin connection it does not make a lot of difference, but for 3 or more pints you need to know what the exact pin distance is.Benno

author: ajb
author_rank: Super Contributor
timestamp: January 13, 2025, 12:38:13 am
content: Quote from: Ventran on January 11, 2025, 05:48:39 pmhttps://www.we-online.com/en/components/products/TBL_3_50_3661_HORIZONTAL_W_HOOK_ON_BACK_SIDE_69136611000Xhttps://www.we-online.com/en/components/products/TBL_3_50_3631_HORIZONTAL_W_HOOK_ON_WIRE_SIDE_69136311000XOr you can see all of their pluggable options here:https://www.we-online.com/en/components/products/em/connectors/terminal_blocks/pluggable_connector_contbl3

author: Ventran
author_rank: Contributor
timestamp: January 13, 2025, 09:28:36 am
content: @ajb, this won't work because there will be no way to mount the wires.The mounting holes for the wires will be completely covered by the enclosureThe mounting holes for the cables will not be available on the bottom PCB when the case is mounted on a DIN rail. I assume that all the connectors must be the same type.

author: Finder
author_rank: Unknown
timestamp: January 13, 2025, 12:07:29 pm
content: Does it have to be a screw terminal?Phoenix Contact has the FMC series.https://www.phoenixcontact.com/en-pc/products/printed-circuit-board-connector-fmc-15-2-st-35-1952267

author: ajb
author_rank: Super Contributor
timestamp: January 13, 2025, 03:59:50 pm
content: Quote from: Finder on January 13, 2025, 12:07:29 pmThat's a good suggestion, and come to think of it I've seen that format on IDEC PLCs in both spring and screw terminal form. The ones I have here are stamped "DINKLE", which is not a brand I'm familiar with. They have a few unusual plug options, but annoyingly lump 3.5 and 3.81mm pitches together on their website:https://www.dinkle.com/en/terminal_List/PCB-Connector-Plug?page=0&pagenum=100&vValue=a-2,b-0,e-0,f-0

author: Ventran
author_rank: Contributor
timestamp: January 15, 2025, 10:52:31 am
content: The problem has now been officially resolved. We contacted the connector manufacturer and found that they were able to supply connectors that met our specifications.