Trampas is right and i misread the data sheet (im getting senile i guess).
It was .127mm and I found an adapter board at DigiKey. Thanks all.

Mea culpa

Charles J. Lord, PE
President, Blue Ridge Advanced Design and Automation
Past Chair, IEEE-USA Consultants Committee
Life Member Chair, IEEE Western NC Section
Chair, IEEE NC Council
Co-Chair, IEEE SoutheastCon 2025
[email protected]

On Fri, Jan 30, 2026, 4:40 PM Trampas Stern <[email protected]> wrote:

> I assume you meant 50mils (1.27mm), not 100mils (2.54mm) pitch connector
> not really the 0.5mm for the IDC connector?
>
>
> On Fri, Jan 30, 2026 at 4:39 PM Trampas Stern <[email protected]> wrote:
>
>>
>> https://www.aliexpress.us/item/3256810387685808.html?spm=a2g0o.productlist.main.4.4404l3yRl3yRjp&aem_p4p_detail=202601301338153740085786613140001107788&algo_pvid=76b3a8ea-77ec-43fa-bd69-16e80f08c971&algo_exp_id=76b3a8ea-77ec-43fa-bd69-16e80f08c971-3&pdp_ext_f=%7B%22order%22%3A%224%22%2C%22eval%22%3A%221%22%2C%22fromPage%22%3A%22search%22%7D&pdp_npi=6%40dis%21USD%213.78%213.78%21%21%2126.09%2126.09%21%402103122117698090951294390eca99%2112000052863803206%21sea%21US%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3A88d5e72d%3Bm03_new_user%3A-29895&curPageLogUid=HTyOTN1YWByv&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A1005010574000560%7C_p_origin_prod%3A&search_p4p_id=202601301338153740085786613140001107788_1
>>
>>
>> https://www.aliexpress.us/item/2251832486681011.html?spm=a2g0o.productlist.main.1.4404l3yRl3yRjp&algo_pvid=76b3a8ea-77ec-43fa-bd69-16e80f08c971&algo_exp_id=76b3a8ea-77ec-43fa-bd69-16e80f08c971-0&pdp_ext_f=%7B%22order%22%3A%221%22%2C%22eval%22%3A%221%22%2C%22fromPage%22%3A%22search%22%7D&pdp_npi=6%40dis%21USD%213.05%213.05%21%21%2121.09%2121.09%21%402103122117698090951294390eca99%2160103193656%21sea%21US%210%21ABX%211%210%21n_tag%3A-29910%3Bd%3A88d5e72d%3Bm03_new_user%3A-29895&curPageLogUid=the7TsYHRlHl&utparam-url=scene%3Asearch%7Cquery_from%3A%7Cx_object_id%3A32672995763%7C_p_origin_prod%3A
>>
>> On Fri, Jan 30, 2026 at 4:29 PM Charles J. Lord, PE via TriEmbed <
>> [email protected]> wrote:
>>
>>> No - the one on the White board is not the standard 0.1 in connector. It
>>> is 0.5 mm. That is the problem. And it is the same ribbon as the blue
>>> board.
>>>
>>> Charles J. Lord, PE
>>> President, Blue Ridge Advanced Design and Automation
>>> Past Chair, IEEE-USA Consultants Committee
>>> Life Member Chair, IEEE Western NC Section
>>> Chair, IEEE NC Council
>>> Co-Chair, IEEE SoutheastCon 2025
>>> [email protected]
>>>
>>> On Fri, Jan 30, 2026, 4:22 PM Carl Nobile <[email protected]> wrote:
>>>
>>>> The 1st one on the blue board is a flat cable connector that is often
>>>> used to connect a keyboard to a computer, and is not easy to work with. The
>>>> one on the white board is a more standard 40-pin connector, probably
>>>> compatible with the one I was talking about before; however, there's no
>>>> locking mechanism, as the one from Amazon has. I see no easy way to mate
>>>> the two since they would use different types of cables without an
>>>> intermediate board that has two connectors on it.
>>>> Someone else may have more experience with this than I do, however.
>>>>
>>>> ~Carl
>>>>
>>>>
>>>> On Fri, Jan 30, 2026 at 4:10 PM Charles J. Lord, PE via TriEmbed <
>>>> [email protected]> wrote:
>>>>
>>>>> Hi all-
>>>>>
>>>>> I'm stuck trying to find what should be a simple cable or connection.
>>>>> I'm working with a development board that brings all of its I/O through a
>>>>> female 40 pin IDC connector with 0.5mm pitch (see pic 1) and i need to
>>>>> bring it out, preferably to a 0.1" pitch that i can work with. All im
>>>>> finding are cables designed for FFC /FPC zif connectors like the example
>>>>> breakout board in the second pic (even Amazon stocks that kind of board).
>>>>> Any pointers to that cable? Thanks in advance!
>>>>>
>>>>> NOTE - THIS IS NOT A 0.1" SPACING CONNECTOR
>>>>>
>>>>> Charles
>>>>>
>>>>>
>>>>>
>>>>> Charles J. Lord, PE
>>>>> President, Blue Ridge Advanced Design and Automation
>>>>> Past Chair, IEEE-USA Consultants Committee
>>>>> Life Member Chair, IEEE Western NC Section
>>>>> Chair, IEEE NC Council
>>>>> Co-Chair, IEEE SoutheastCon 2025
>>>>> [email protected]
>>>>> _______________________________________________
>>>>> Triangle, NC Embedded Interest Group mailing list
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>>>>>
>>>>
>>>> --
>>>> --------------------------------------------------------------
>>>> Carl J. Nobile (Software Engineer/API Design)
>>>> [email protected]
>>>> --------------------------------------------------------------
>>>>
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