NXP Semiconductors FS32K146ULT0VLLR

Overview

FS32K146ULT0VLLR from NXP Semiconductors is an automotive-grade 32-bit Arm Cortex-M4F microcontroller with 2 MB flash, 256 KB SRAM (both with ECC), 112 MHz HSRUN operation, dual 12-bit ADCs (up to 32 channels), and integrated CSEc security engine. It supports CAN-FD, LPUART/LIN, LPSPI, LPI2C, FlexIO, and Ethernet MAC - deployed in vehicle body control modules requiring ASIL-B functional safety compliance.

For engineers reviewing the FS32K146ULT0VLLR datasheet, FS32K146ULT0VLLR pinout, FS32K146ULT0VLLR application, or FS32K146ULT0VLLR equivalent, this page delivers verified specifications, package mapping to 100-pin LQFP, validated alternative parts, and design-critical timing/power mode constraints - including mandatory RUN-mode (80 MHz) execution for CSEc or EEPROM operations.

Technical Context

The FS32K146ULT0VLLR implements a dual-core architecture with Arm Cortex-M4F (HSRUN/RUN modes) and optional M0+ co-processor support per family documentation, featuring a System PLL (SPLL) scalable to 112 MHz and independent clock domains for peripherals including FIRC (48 MHz), SIRC (8 MHz), and LPO (128 kHz). Its AXBS-Lite crossbar switch enables concurrent access by CPU, DMA, and Ethernet to protected memory regions via NXP's system MPU - not Arm's core MPU.

Power management includes five defined modes (HSRUN, RUN, STOP, VLPR, VLPS), with HSRUN restricted to ≤105 °C ambient and RUN mode required for CSEc cryptographic operations or FlexNVM writes/erases. Memory subsystem integrates ECC on 2 MB flash, 256 KB SRAM, and 64 KB FlexNVM with EEPROM emulation capability.

Key Specifications

Pinout & Package

FS32K146ULT0VLLR is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per the S32K1xx Reference Manual IO Signal Description sheet; I/O count reaches up to 81 pins depending on peripheral enablement and pin multiplexing configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FS32K144UJT0VLQR, FS32K146ULT0VLLR delivers 112 MHz HSRUN headroom and larger SRAM for complex control loops; versus FS32K148UJT0VLQR, it omits Ethernet and SAI to reduce cost and power - making it ideal for mid-tier automotive control units where those features are unused.

Availability

FS32K146ULT0VLLR is available at Aetrix Electronics and suitable for automotive body control, electric power steering, and battery management systems requiring stable component supply across extended product lifecycles and rigorous qualification standards.

Supply support for FS32K146ULT0VLLR 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 deep expertise in functional safety and automotive-grade reliability.

The S32K1xx family - including FS32K146ULT0VLLR - was designed specifically for ASIL-B automotive control applications, integrating safety mechanisms, security engines, and low-power operation to meet ISO 26262 requirements out-of-the-box.

FAQ

What is the maximum operating frequency of the FS32K146ULT0VLLR, and under what conditions is it guaranteed?

The FS32K146ULT0VLLR achieves 112 MHz in HSRUN mode, but this frequency is only guaranteed at ambient temperatures up to 105 °C. Above that threshold, the device must operate in RUN mode at 80 MHz to maintain reliability and thermal safety. This constraint is explicitly documented in the S32K1xx Data Sheet Rev. 15, Section 3.1 Feature Comparison and Thermal Operating Characteristics tables.

Does the FS32K146ULT0VLLR support CAN-FD, and how many instances are available?

Yes, the FS32K146ULT0VLLR includes three FlexCAN modules, each supporting CAN-FD per ISO 11898-1. In the 100-pin LQFP package (VLL), all three CAN-FD controllers are fully routable and usable - confirmed in the S32K1xx Product Series Comparison (Figure 3) and IO Signal Description documentation.

Can CSEc cryptographic operations be executed while the FS32K146ULT0VLLR runs at 112 MHz?

No. The FS32K146ULT0VLLR triggers error flags if CSEc (Security) or EEPROM write/erase commands are issued in HSRUN mode (112 MHz). As stated in multiple sections of the datasheet - including Features, Block Diagram notes, and Ordering Information - the device must switch to RUN mode (80 MHz) before initiating any CSEc or FlexNVM operation.

What package type and pin count does the FS32K146ULT0VLLR use?

The FS32K146ULT0VLLR uses a 100-pin LQFP package (suffix "VLL"), measuring 14 mm × 14 mm with 0.5 mm pitch and an exposed thermal pad. This is confirmed by the ordering code breakdown in Figure 5 of the datasheet, where "VLL" maps directly to 100-pin LQFP, and verified in the Features Comparison table (Figure 3).

How much on-chip SRAM and flash memory does the FS32K146ULT0VLLR provide, and is ECC supported?

The FS32K146ULT0VLLR integrates 256 KB of SRAM and 2 MB of program flash memory - both protected by Error-Correcting Code (ECC) as specified in the "Memory and memory interfaces" section. Additionally, it includes 64 KB of FlexNVM (with ECC) for data flash and EEPROM emulation, and 4 KB of FlexRAM configurable as SRAM or EEPROM backup.