NXP Semiconductors MIMXRT633SFVKB

Overview

MIMXRT633SFVKB from NXP Semiconductors is a dual-core Arm Cortex-M33 + Cadence Xtensa HiFi4 audio DSP microcontroller in VFBGA176 package, operating at up to 300 MHz (M33) and 600 MHz (HiFi4), with 4.5 MB shared SRAM and hardware TrustZone security-designed for real-time voice processing in resource-constrained edge audio devices.

For engineers reviewing the MIMXRT633SFVKB datasheet, MIMXRT633SFVKB pinout, MIMXRT633SFVKB application, or MIMXRT633SFVKB equivalent, key selection criteria include dual-core asymmetric execution, eSPI omission, 96 GPIO count, absence of HiFi4 DSP core, and VFBGA176 mechanical compatibility with RT685-series variants.

Technical Context

The MIMXRT633SFVKB implements an Arm Cortex-M33 CPU with TrustZone, FPU, MPU, and two coprocessors (PowerQuad DSP accelerator and Casper crypto/FFT engine), while omitting the Xtensa HiFi4 DSP core present in RT685 variants-making it a cost-optimized control-dominant variant within the RT600 family.

It integrates FlexSPI with 32 KB cache and on-the-fly AES decryption, dual SDIO/eMMC interfaces, eight configurable Flexcomm serial modules (USART/I²C/SPI/I²S), a 12-bit 1 MS/s ADC, AES256/SHA hash engines with PUF key generation, and supports boot from SPI, UART, USB, or eMMC via ROM bootloader.

Key Specifications

Pinout & Package

VFBGA176 package: thin fine-pitch ball grid array, 176 balls, body size 9 mm × 9 mm × 0.98 mm, 0.65 mm ball pitch, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with MIMXRT633SFVKB, MIMXRT685SFVKB adds audio DSP capability and memory for complex voice stacks, while MIMXRT633SFFOB offers identical functionality in a smaller, thermally superior package-making MIMXRT633SFVKB optimal for cost-sensitive, board-space-available industrial control designs requiring proven VFBGA176 assembly processes.

Availability

MIMXRT633SFVKB is available at Aetrix Electronics and suitable for smart home gateways, industrial HMIs, audio-enabled sensor hubs, and secure edge data loggers requiring stable component supply across multi-year production cycles.

Supply support for MIMXRT633SFVKB 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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The RT600 product line delivers scalable dual-core microcontrollers optimized for real-time voice, audio, and sensor fusion at the intelligent edge-with MIMXRT633SFVKB targeting cost-efficient, control-centric implementations where full DSP capability is unnecessary.

FAQ

Does MIMXRT633SFVKB include the Xtensa HiFi4 Audio DSP core?

No, MIMXRT633SFVKB contains only the Arm Cortex-M33 core and omits the Xtensa HiFi4 DSP found in RT685 variants. This makes MIMXRTRT633SFVKB a control-optimized derivative within the RT600 family, reducing silicon area and cost while retaining PowerQuad and Casper coprocessors for accelerated DSP and crypto operations. The absence of HiFi4 means MIMXRT633SFVKB cannot execute NXP's Premium Voice Software suite natively.

What is the maximum SRAM capacity supported by MIMXRT633SFVKB?

MIMXRT633SFVKB supports 2 MB of on-chip SRAM, confirmed in Table 2 of the RT600 datasheet under "Ordering options." This is half the 4.5 MB available in RT685 variants and is partitioned into up to 30 configurable segments accessible by both CPUs and DMA engines. The 2 MB allocation balances memory bandwidth, power, and cost for non-audio-intensive real-time control applications using MIMXRT633SFVKB.

Is eSPI interface available on MIMXRT633SFVKB?

No, eSPI is not implemented on MIMXRT633SFVKB. As shown in Table 2 ("Ordering options"), the "eSPI" column for MIMXRT633SFVKB is marked "No," distinguishing it from MIMXRT685SFVKB and MIMXRT685SVFVKB. This omission simplifies power architecture by removing dependency on eSPI-compatible PMICs, making MIMXRT633SFVKB suitable for designs using discrete LDOs or simpler power management schemes.

How many Flexcomm interfaces does MIMXRT633SFVKB support?

MIMXRT633SFVKB supports six Flexcomm interfaces (Flexcomm 0 through 5), as specified in Table 2 under "Flexcomm Interfaces (0 to 7)." Each Flexcomm module can be configured as USART, I²C, SPI, or I²S with integrated FIFO and DMA support. This count is lower than the eight interfaces on RT685 variants, reflecting its streamlined peripheral set while still enabling concurrent audio streaming, debug, and flash communication using MIMXRT633SFVKB.

What package type is used for MIMXRT633SFVKB?

MIMXRT633SFVKB uses the VFBGA176 package: a thin fine-pitch ball grid array with 176 balls, 9 mm × 9 mm body size, and 0.98 mm height. This package is mechanically compatible with MIMXRT685SFVKB and MIMXRT685SVFVKB, enabling PCB layout reuse across RT600 variants-though pin mapping must be verified against Table 4 in the datasheet due to functional differences between variants.