NXP Semiconductors SPC5746BK1MKU2R

Overview

SPC5746BK1MKU2R from NXP Semiconductors is a dual-core automotive microcontroller featuring a 160 MHz e200z4 CPU and an 80 MHz e200z2 CPU, 3 MB on-chip flash, 384 KB SRAM with end-to-end ECC, and integrated HSMv2 security module. It supports CAN FD across eight FlexCAN modules, Ethernet (10/100 with AVB, IEEE 1588), and dual-channel FlexRay - deployed in engine control units and advanced driver assistance systems requiring ASIL-B compliance.

For engineers reviewing the SPC5746BK1MKU2R datasheet, SPC5746BK1MKU2R pinout, SPC5746BK1MKU2R application, or SPC5746BK1MKU2R equivalent, key selection criteria include dual-core deterministic timing, functional safety certification (ISO 26262 ASIL-B), hardware security (HSMv2), flash memory partitioning for RWW operation, and support for high-integrity communication stacks including CAN FD, FlexRay, and Ethernet AVB.

Technical Context

The SPC5746BK1MKU2R implements a crossbar switch architecture enabling concurrent access to flash, SRAM, and peripherals by multiple bus masters-including both e200z4 and e200z2 cores, eDMA, and debug interfaces. Its memory subsystem includes triple-ported 3 MB flash with three page buffers and 384 KB SRAM distributed across three RAM ports, all protected by SECDED ECC on 64-bit data + 29-bit address paths.

Timing and safety are enforced via dedicated modules: Clock Monitor Unit (CMU), Frequency Modulated PLL (FMPLL), System Memory Protection Unit (SMPU) with 32 region descriptors, Fault Collection and Control Unit (FCCU), and Boot Assist Flash (BAF) supporting serial flash programming. The device integrates eight FlexCAN3 controllers with CAN FD capability, four DSPI, four I²C, and ENET complex with multi-queue AVB and IEEE 1588 timestamping.

Key Specifications

Pinout & Package

SPC5746BK1MKU2R is housed in a 176-pin LQFP-EP (exposed pad) package, optimized for thermal dissipation in automotive powertrain applications. Pin assignments follow NXP's standardized MPC5746C family layout, with dedicated supply domains (VDD_HV_A/B/C, VDD_LV), analog inputs (ADC0/ADC1, CMP), and high-speed interface banks (CAN, FlexRay, ENET, DSPI).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SPC5746BK1MKU2R, MPC5746CK1MJ2R offers identical functionality in a denser package for compact automotive modules, while SPC58NG84C3MAB delivers generational improvements in performance and security-but requires full hardware redesign due to non-pin-compatibility and revised peripheral mapping.

Availability

SPC5746BK1MKU2R is available at Aetrix Electronics and suitable for engine control units, ADAS sensor fusion hubs, electric powertrain inverters, and vehicle domain controllers requiring stable component supply across extended automotive lifecycles.

Supply support for SPC5746BK1MKU2R 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 applications, with deep expertise in functional safety and automotive-grade microcontrollers.

The SPC5746BK1MKU2R belongs to NXP's SPC574x family of Power Architecture® automotive MCUs, designed specifically for ASIL-B compliant powertrain and chassis control applications demanding deterministic real-time performance, hardware security, and long-term reliability.

FAQ

What is the maximum operating frequency of the SPC5746BK1MKU2R's primary CPU core?

The SPC5746BK1MKU2R features a 160 MHz e200z4 core as its primary CPU, capable of dual-issue 32-bit instruction execution with single-precision floating-point support and Variable Length Encoding (VLE) for optimized code density. This frequency is validated across the full –40°C to +125°C ambient temperature range per the datasheet's recommended operating conditions. The SPC5746BK1MKU2R also includes a secondary 80 MHz e200z2 core for auxiliary tasks.

Does the SPC5746BK1MKU2R support CAN FD, and how many channels are available?

Yes, the SPC5746BK1MKU2R supports CAN FD across all eight integrated FlexCAN3 modules (FlexCAN0 through FlexCAN7), each configurable for up to 5 Mbps data rates and backward compatibility with classical CAN 2.0B. This capability is confirmed in the MPC5746C datasheet Rev. 6 section "Communication" and Table 1 (Family Comparison), where MPC5746C is explicitly listed with "8 with optional CAN FD support."

What package type and pin count does the SPC5746BK1MKU2R use?

The SPC5746BK1MKU2R uses a 176-pin LQFP-EP (Leadless Quad Flat Package with Exposed Pad) package, designated by the "KU" suffix in its orderable part number. This thermally enhanced package supports automotive under-hood operation and provides dedicated power/ground pins, analog input groups, and high-speed interface banks aligned to NXP's MPC5746C family pinout standard.

Is the SPC5746BK1MKU2R certified for functional safety standards?

Yes, the SPC5746BK1MKU2R is ISO 26262 ASIL-B compliant, with safety mechanisms including end-to-end ECC, System Memory Protection Unit (SMPU), Fault Collection and Control Unit (FCCU), Clock Monitor Unit (CMU), and hardware watchdog timers. These features are documented in the MPC5746C datasheet Rev. 6 section "Functional Safety" and supported by NXP's ASIL-B safety manual and FMEDA reports.

What security features does the SPC5746BK1MKU2R include?

The SPC5746BK1MKU2R integrates HSMv2 (Hardware Security Module version 2) with cryptographic accelerators (AES-128/256, SHA-256, RSA-2048), secure boot, key provisioning, and Password and Device Security (PASS) for lifecycle management. These capabilities enable UNECE R155 compliance and are detailed in the MPC5746C datasheet Rev. 6 section "Security" and associated NXP application notes AN5403 and AN5404.