Secure access module IC supports MIFARE-based contactless system implementations. The family is associated with MIFARE SAM AV3 secure access module functionality for key storage and cryptographic support. Public static sources did not provide an authoritative exact-orderable NXP datasheet for the submitted suffix, so electrical and package details require review.
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These are design resources that include the NXP MF4SAM3X84/9Brrff
A guide for the MIFARE SAM AV3 secure application module, detailing cryptographic features, package options, ISO/IEC 7816 and I2C interfaces, and hardware design considerations.
