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PCB mount female IDC connector
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HackedFridgeMagnet:
https://www.digikey.com/product-detail/en/sullins-connector-solutions/SFH11-PBPC-D08-ST-BK/S9196-ND/1990089

didn't count the pins so you better check that.
 It was under the filter "board to board" among others.
PlainName:
Is this for production or small run/shelfware? There are tons of them on Ebay:

5Pcs 2X10 20Pin 2.54MM Double Row Female = £2.16
stevelup:
Those aren’t what the OP is looking for. He’s after something that replicates the size and shape of an IDC plug.
PlainName:
Admittedly they don't have the keyway and side fillers, and if those are important then you are right that these are not the ones for the job. For PCB mating those tend not to be so important because the facility they provide (orientation and position) tend to be rather more fixed than with cables...
crackwitz:
If you're looking for an edge-mount header, or you want to submit a gerber with funky looking slots for "TH pads" to the PCB fab...

Some while ago I ordered a dongle for a J-Link, for that 2x10-pin male IDC header on these things. As you can imagine, the dongle needed to present the matching female side.

Whoever designed it just used a female header with insulation-displacing knife contacts... and left the second plastic piece off, and soldered those knives to a PCB. The space between the knives, for the PCB to go, is about 1.1 mm, according to some dimension schematics I found on google. The dongle's PCB was correspondingly thinner than normal.

The pads for a footprint would be shifted 0.025" one way on the top side and 0.025" the other way on the bottom, for a 0.050" pitch, matching the ribbon cable. I might give a 1.2 mm PCB a try but that might be tight and bending the contacts.

Attached picture is from a random aliex listing, shows the insulation-displacing knives in detail.

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