This is an excellent choice for Security due to its outstanding performance.There is a M5.1 Chip Card Module package available to save space.There is a Bulk package available for it.To find equivalent components, use its SLE66CX80 base part number.
SLE 66CX80PE M5.1 Features
M5.1 Chip Card Module package
SLE 66CX80PE M5.1 Applications
There are a lot of Infineon Technologies SLE 66CX80PE M5.1 Microcontroller applications.