NXP Semiconductors MIMXRT533SFFOCR

Overview

MIMXRT533SFFOCR from NXP Semiconductors is a dual-core Arm Cortex-M33 + Cadence Xtensa Fusion F1 DSP crossover processor for ultra-low-power embedded applications, featuring 3 MB shared SRAM, AES-256/SHA-256 crypto acceleration with SRAM PUF key generation, and high-speed USB 2.0 host/device with integrated PHY-used in battery-powered voice-enabled edge nodes requiring secure boot and real-time audio processing.

For engineers reviewing the MIMXRT533SFFOCR datasheet, MIMXRT533SFFOCR pinout, MIMXRT533SFFOCR application, or MIMXRT533SFFOCR equivalent, this page delivers verified core architecture, power domain partitioning, FlexComm configurability, security isolation boundaries, and package-specific thermal limits-critical for low-power MCU selection in industrial IoT gateways and portable HMI designs.

Technical Context

The MIMXRT533SFFOCR implements Arm TrustZone for hardware-enforced secure/non-secure world separation, with independent power domains enabling selective shutdown of the DSP subsystem while retaining Cortex-M33 operation in Deep Sleep mode. Its five VDDIO rails support mixed-voltage I/O interfacing across GPIO banks.

It integrates two FlexSPI interfaces (Octal/Quad) with 32 KB per-cache and on-the-fly AES decryption for execute-in-place from external flash, plus twelve FlexComm modules configurable as UART/I²C/SPI/I²S-each with dedicated FIFO and DMA support-enabling concurrent serial protocol stacks without CPU overhead.

Key Specifications

Pinout & Package

FOWLP249 (249-pin Fan-Out Wafer-Level Package), 7.0 mm × 7.0 mm × 0.725 mm, 0.4 mm pitch, MSL3 moisture sensitivity level. Thermal resistance R_θJA = 29.6 °C/W (JESD51-9, still air).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-core MCU applications.

Compared with MIMXRT533SFFOCR, MIMXRT555SFFOCR adds graphics acceleration at the cost of DSP capability-ideal for touchscreens but unsuitable for voice AI; MIMXRT533SFAWCR trades package size and peripheral count for footprint reduction-viable only when USB HS and full FlexComm count are non-essential.

Availability

MIMXRT533SFFOCR is available at Aetrix Electronics and suitable for industrial edge gateways, portable medical monitors, voice-controlled smart home hubs, and secure access terminals requiring stable component supply across multi-year production cycles.

Supply support for MIMXRT533SFFOCR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with over 30 years of microcontroller innovation and ISO 9001-certified manufacturing.

The i.MX RT500 series targets ultra-low-power crossover processors bridging MCU simplicity with application-processor capability-designed specifically for always-on, battery-operated edge devices demanding real-time responsiveness, hardware security, and heterogeneous compute.

FAQ

What is the maximum operating frequency of the Cortex-M33 core in the MIMXRT533SFFOCR?

The Cortex-M33 core in the MIMXRT533SFFOCR operates at up to 275 MHz under standard conditions. This maximum frequency is supported across the full industrial temperature range (–20 °C to +85 °C) when VDDCORE is supplied at 1.155 V. For USB high-speed host/device operation, the minimum required M33 clock is 90 MHz; OTP programming requires ≤120 MHz. The MIMXRT533SFFOCR datasheet specifies these limits in Table 8 under General Operating Conditions.

Does the MIMXRT533SFFOCR include a hardware DSP core, and what is its role?

Yes, the MIMXRT533SFFOCR integrates a Cadence Tensilica Fusion F1 DSP core running at up to 275 MHz. Its primary role is offloading computationally intensive tasks such as voice wake-word detection, audio beamforming, sensor fusion, and neural network inference-freeing the Cortex-M33 core for real-time control and communication stack management. Unlike the MIMXRT555SFFOCR and MIMXRT595SFFOCR variants, the MIMXRT533SFFOCR retains this DSP while omitting the 2.5D GPU.

What security features are implemented in the MIMXRT533SFFOCR, and how do they differ from basic MCU offerings?

The MIMXRT533SFFOCR implements hardware-enforced security including Arm TrustZone for secure/non-secure world isolation, SRAM PUF-based key generation, on-the-fly AES decryption (OTFAD) for external flash, and certificate-based debug authentication. These features exceed typical MCU security by providing immutable root-of-trust via ROM bootloader, side-channel resistant crypto accelerators (Casper), and tamper-evident secure debug-meeting PSA Certified Level 3 and Common Criteria EAL4+ requirements out-of-the-box.

What package type and thermal characteristics apply to the MIMXRT533SFFOCR?

The MIMXRT533SFFOCR uses the FOWLP249 package: 7.0 mm × 7.0 mm × 0.725 mm, 0.4 mm pitch, with moisture sensitivity level (MSL) 3. Its junction-to-ambient thermal resistance is 29.6 °C/W (JESD51-9, still air). This fan-out wafer-level package supports higher I/O density and better thermal performance than WLCSP alternatives-critical for sustained 275 MHz operation in compact industrial enclosures without forced airflow.

How many FlexComm interfaces does the MIMXRT533SFFOCR support, and what protocols can they configure?

The MIMXRT533SFFOCR supports twelve FlexComm interfaces, each configurable as USART (with fractional baud rate generator and LIN2.2 support), I²C (Fast-mode Plus, 1 Mb/s), SPI, or I²S (up to four channel-pairs). Additionally, it includes two dedicated high-speed SPI interfaces (50 MHz) and two I³C buses. This flexibility allows concurrent implementation of multiple serial protocols-for example, one FlexComm as USB CDC UART, another as I²C sensor hub, and a third as I²S audio output-without resource contention.