NXP Semiconductors FS32K146HRT0MLHR

Overview

FS32K146HRT0MLHR from NXP Semiconductors is an automotive-grade 32-bit Arm Cortex-M4F microcontroller designed for real-time control in safety-critical ECUs. It operates at up to 112 MHz (HSRUN mode), features 2 MB ECC-protected flash, 256 KB SRAM with ECC, and supports -40 °C to +125 °C ambient operation. It integrates FlexCAN with optional CAN-FD, multiple low-power communication interfaces, and CSEc cryptographic engine - deployed in body control modules and chassis domain controllers.

For engineers reviewing the FS32K146HRT0MLHR datasheet, FS32K146HRT0MLHR pinout, FS32K146HRT0MLHR application, or FS32K146HRT0MLHR equivalent, key selection considerations include HSRUN/RUN mode switching constraints for CSEc/EEPROM operations, 100-pin LQFP package compatibility, ASIL-B capable safety architecture, and FlexIO protocol emulation capability for legacy bus bridging.

Technical Context

The FS32K146HRT0MLHR implements a dual-core-capable Arm Cortex-M4F core with integrated FPU and DSP extensions, executing at 112 MHz in HSRUN mode (requiring voltage ≥2.7 V) and 80 MHz in RUN mode (required for CSEc security operations and EEPROM emulation). Its AXBS-Lite crossbar switch enables concurrent access by CPU, DMA, and Ethernet MAC to memory and peripherals while enforcing memory protection via NXP's system MPU - not Arm's core MPU.

Power management includes five distinct modes (HSRUN, RUN, STOP, VLPR, VLPS), with clock gating applied per peripheral. The device uses SPLL for high-speed system clock generation, FIRC/SIRC/LPO oscillators for low-power timing, and supports IEEE 1588 timestamping via its 10/100 Mbps Ethernet MAC - though Ethernet is not implemented in this specific variant per feature comparison data.

Key Specifications

Pinout & Package

FS32K146HRT0MLHR is housed in a 100-pin LQFP package (14 × 14 mm, 0.5 mm pitch), with pin-compatible footprint across S32K14x family members sharing this package option. Pin functions are defined per I/O signal multiplexing tables in the S32K1xx Reference Manual.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FS32K146HRT0MLHR, S32K148HRT0MLHR adds Ethernet and SAI but requires PCB redesign, while S32K144HRT0MLHR offers identical package and pin compatibility with lower memory and one fewer FlexCAN - making it a direct drop-in alternative for less demanding applications.

Availability

FS32K146HRT0MLHR is available at Aetrix Electronics and suitable for automotive body control modules, chassis domain controllers, gateway ECUs, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for FS32K146HRT0MLHR 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 S32K1xx family - including FS32K146HRT0MLHR - was engineered specifically for ASIL-B automotive applications, emphasizing functional safety, real-time determinism, and cryptographic security in electronic control units.

FAQ

What is the maximum operating frequency of the FS32K146HRT0MLHR and under what conditions?

The FS32K146HRT0MLHR achieves 112 MHz in HSRUN mode, but only when supplied within 2.7–5.5 V and operating at ambient temperatures ≤105 °C. For CSEc security operations or EEPROM emulation, it must drop to 80 MHz RUN mode - a mandatory hardware-enforced transition to prevent error flag generation during flash writes.

Does the FS32K146HRT0MLHR support CAN-FD, and how many channels are available?

Yes, the FS32K146HRT0MLHR supports CAN-FD on up to two of its three FlexCAN modules, as confirmed in the S32K1xx product series comparison table. The third FlexCAN channel operates in classical CAN mode only. All three channels are accessible in the 100-pin LQFP package.

What safety certifications or architectural features does the FS32K146HRT0MLHR provide for automotive use?

The FS32K146HRT0MLHR implements ISO 26262 ASIL-B capable features including ECC on flash/SRAM, system MPU-based memory protection, CRC module, dual watchdogs (WDOG and EWM), and lockstep-capable peripherals. Its safety manual and FMEDA report are available from NXP under NDA for functional safety integration.

Can the FS32K146HRT0MLHR execute cryptographic operations while running at 112 MHz?

No - the FS32K146HRT0MLHR cannot execute CSEc cryptographic operations or EEPROM writes/erases in HSRUN mode (112 MHz). Doing so triggers error flags; the device must switch to RUN mode (80 MHz) first. This behavior is explicitly documented in the datasheet's power management and security sections.

What package type and pin count does the FS32K146HRT0MLHR use, and is it pin-compatible with other S32K14x variants?

The FS32K146HRT0MLHR uses a 100-pin LQFP package (14 × 14 mm, 0.5 mm pitch). Per the datasheet, all S32K14x devices sharing the same package are pin-to-pin compatible - including S32K144HRT0MLHR and S32K142HRT0MLHR - enabling scalable design reuse across performance tiers.