Re: [EE] Help with understanding microcontroller markings

Google AI has comments on marking and programming at
https://share.google/aimode/91bZsz0Rnsnbcux5r

Harold
https://w6iwi.org


On Sat, April 11, 2026 4:27 pm, William Couture wrote:
> Hi folks!
>
>
> At work, we have an old design using the P89LPC936F chip (by NXP).  They
> are no longer made, and we're buying old lots and using them.
>
> But we have 3 batches of chips, and 2 of them won't program.  They are
> New
> Old Stock, still in their reels.  I've tried look at the NXP
> documentation, but haven't found anythings to tell me what the additional
> lines of marking mean.
>
> The first batch is marked
> P89LPC936F
> CR6028  01
> TnD1343A
>
>
> The second batch is marked
> P89LPC936F
> CKA897  02
> TnD1546A
>
>
> The third batch is marked
> P89LPC936F
> CM9073  03
> TuD1644A
>
>
> Only the "CKA897  02" chips will program.  Any idea of what the 2nd and
> 3rd
> lines are? Date codes?  Batch codes?  Or...?
>
>
> Also, while trying to find documentation on the chip markings, I found
> that alibaba.com seems to have vendors selling these chips (though not
> from NXP). https://www.alibaba.com/showroom/p89lpc936f.html
> https://www.alibaba.com/product-detail/Support-BOM-Quotation-MARK-P89LPC93
> 6F-TSSOP28_1601651848661.html
> https://www.alibaba.com/product-detail/New-and-Original-In-Stock-P89LPC936
> F_1601671412800.html
>
>
> Any comments on alibaba.com or these vendors?
>
>
> Thanks!
> Bill
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