Just a short FYI below. I deal with this fairly often in my line of work since I've had designs in production for +20 years.
Vendors (i.e. NXP) typically notify the manufactures that use the part, that it is going obsolete so they can do a 'lifetime' buy. That allows manufactures (i.e. Stern) to buy stock needed for the expected production runs plus whatever is needed for some stock. Also, there's the possibility of a new NXP part which still performs the functions of the old part. Maybe they simply changed a clock frequency, or increased the ROM or RAM and the original part goes by the wayside. That actually happens a fair amount on the analog side of the design fence, not sure about digital parts. But it is a 'new' part nonetheless, so the manufacture would need to update their BOMs (Bill of Material, fancy way of saying 'parts list'). There's even been times where a 3rd party comes in and buys the old design and they manufacture the chip instead. If the quantities justify it, manufactures can even pay a vendor to produce extra wafers (I doubt that applies here) and the vendors build the parts when needed.
If you look at the LPC10xx series, it looks like they make +20 versions of that chip...so it could be as simple as the LPC1112E going obsolete, not the entire series.