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I'm working with boards that have a mix of pin pitch and occasionally I need to connect a 2.54mm pin to a 1.27mm pin. The most recent example was to get access to UART output that was being provided via 1.27mm but my USB-to-UART adapter has 2.54mm. Soldering would work but I'd prefer something more temporary that I can quickly connect/disconnect.

(This is my first post to this community so feel free to edit the post/tags and give me a nudge in a better direction if I'm off track.)

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  • \$\begingroup\$ Make an adapter? Like in PCB or a cable with two connectors matching both sides. \$\endgroup\$ – Eugene Sh. Jan 17 '19 at 17:46
  • \$\begingroup\$ @EugeneSh.I wish I could get connectors matching both sides but I haven't been able to find any single-connector 1.27mm female connectors. Surely they exist somewhere but darned if I can find them. \$\endgroup\$ – Andrew Cottrell Jan 17 '19 at 21:10
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There are several ways to approach the problem, but what I would do (and I do), is to keep some male/female headers with a 1.27mm and 2.54mm pitch always in the drawer together with some wirewrap wire. In that way, when the issue comes up, it doesn't take long to create a bridge cable to convert from one pitch/pinout to the other.

With a bit of practice, it is not too hard to solder on a 1.27mm connector.

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Many hobby shops sell patch cables also called jumper cables. They come in various lengths and bundles. The picture below shows a bundle of 40 female-female cables. You can make sets of one, two or more cables by pulling them apart.

I found they fit most header pins.

enter image description here

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  • \$\begingroup\$ I have a variety of these actually (M-M, M-F, F-F) but they are all 2.54mm pitch and just too huge to use on the 1.27mm pins which are super-tiny. I haven't been able to find any single-connector 1.27mm female jumper wires. Would be great if I could! \$\endgroup\$ – Andrew Cottrell Jan 17 '19 at 21:05

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