Hi Johny,
Unfortunately, there is no direct replacement.
Depend on your application requirements and peripherals which are relevant for you.
Very useful and well-arranged document about automotive devices it can be also helpful for choosing the right device. See 16-bit S12(X) MCUs or 16-bit S12 MagniV MCUs.
http://pdf1.solecsy.com/26/78c49d0c-741a-43be-a512-9ca142bc5ffc.pdf
The products which can be found on the below link are available for a minimum of 10 years from product launch
Product Longevity|NXP
The MC9S12DG128CFUE with 5L40K mask set is still active, but that device is not in longevity program.
MC9S12DG128CFUE Product Information|NXP
You can look at
S12XD devices are still active, but that devices are not in longevity program.
S12XD MCUs|16-Bit Microcontroller|NXP
S12XE:
S12XE MCUs|16-Bit Microcontroller|NXP
or S12G:
S12G Optimized MCU |16-bit MCUs|NXP
In the attachment, you can see the application notes about compatibility. The devices from the S12XE family like S12G, etc. are not the replacement, for example, the difference is in the memory map.
I hope the information helps.
Best regards,
Diana
