Thank you for your inquiry.
The part number OM5181ET is marked as Customer Specific device. It means that this device was made by NXP based on specific contract for the specific company, only they can obtain the information, all information is confidential.
Our support center is not authorized to check or release information as we do not have an access. We can provide support for standard parts only. Therefore we are not able to compare the parameters to suggest alternative part.
The company for whom this device was made needs to contact their representative inside NXP who can provide more info.
Thank you for understanding.