NXP Semiconductors KW45B41Z52AFPBR

Overview

KW45B41Z52AFPBR from NXP Semiconductors is a low-power, AEC-Q100 Grade 2 qualified wireless MCU integrating an Arm Cortex-M33 core (up to 96 MHz), Bluetooth LE 5.3 radio, and FlexCAN supporting CAN FD per ISO 11898-1 - without integrated CAN transceiver hardware. It features 512 KB flash, 128 KB SRAM, TrustZone-M, EdgeLock Secure Enclave, and operates from –40 °C to +105 °C. It targets secure automotive keyless entry and industrial wireless sensor networks.

For engineers reviewing the KW45B41Z52AFPBR datasheet, KW45B41Z52AFPBR pinout, KW45B41Z52AFPBR application, or KW45B41Z52AFPBR equivalent, this page delivers verified technical context, exact package mapping (6×6 mm 40-pin HVQFN with wettable flanks), real-world power consumption data (<5.3 mA active core current), secure boot architecture, and validated alternative parts for automotive-grade wireless MCU selection.

Technical Context

The KW45B41Z52AFPBR implements a dual-core architecture: a 96 MHz Arm Cortex-M33 application core with TrustZone-M isolation and an independent 64 MHz CM3 radio controller core. Its security subsystem includes EdgeLock Secure Enclave with hardware AES-128/256, ECC P-256/384, SHA2-256/384, PRINCE encryption, and secure key storage - all enforced by TRDC domain partitioning.

It integrates FlexCAN supporting both classical CAN and CAN FD frames up to 5 Mbps, two LPUARTs with LIN compliance, dual LPI2C, dual LPSPI, MIPI-I3C, and a programmable FlexIO module. Power management includes DC/DC buck regulator, Core/SYS LDOs, Smart Power Switch (<100 nA sleep current), and seven low-power modes with RTC retention and 32 KB SRAM hold.

Key Specifications

Pinout & Package

Package: 40-pin HVQFN (SOT618-13(DD)), 6 × 6 × 0.85 mm, 0.5 mm pitch, wettable flanks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with KW45B41Z52AFPBR, KW45B41Z53AFPBR adds integrated CAN FD PHY for direct bus connection, while RA4W1 offers lower-cost BLE-only operation without automotive qualification or CAN FD - making KW45B41Z52AFPBR the optimal choice for CAN FD–enabled, AEC-Q100–compliant wireless control nodes requiring external transceiver flexibility.

Availability

KW45B41Z52AFPBR is available at Aetrix Electronics and suitable for automotive keyless entry systems, wireless battery management nodes, and industrial asset tracking devices requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 Grade 2 compliance.

Supply support for KW45B41Z52AFPBR 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 focused on secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in wireless MCUs and automotive-grade security.

The KW45 product family was designed specifically for secure, low-power wireless control in automotive and industrial environments - combining Bluetooth LE 5.3, CAN FD, and EdgeLock security in a single AEC-Q100 qualified SoC.

FAQ

Does KW45B41Z52AFPBR include an integrated CAN FD transceiver?

No, KW45B41Z52AFPBR integrates FlexCAN controller logic only and requires an external CAN FD transceiver (e.g., TJA1044T) for physical bus connection. This differs from KW45B41Z53AFPBR, which includes the transceiver on-die. The KW45B41Z52AFPBR design allows flexible PHY selection and noise immunity tuning per application requirements.

What is the maximum operating temperature for KW45B41Z52AFPBR?

KW45B41Z52AFPBR is AEC-Q100 Grade 2 qualified with an ambient operating temperature range of –40 °C to +105 °C and junction temperature limit of +125 °C. This rating is confirmed in the official NXP KW45 datasheet Rev. 9 and applies directly to the KW45B41Z52AFPBR variant.

How does KW45B41Z52AFPBR implement secure boot?

KW45B41Z52AFPBR uses immutable Secure Boot ROM that validates digital signatures of firmware images using ECDSA-P256 before loading into flash or RAM. Keys are provisioned during factory programming, and the EdgeLock Secure Enclave enforces runtime integrity checks - ensuring only authenticated, unmodified code executes on the KW45B41Z52AFPBR.

What power modes does KW45B41Z52AFPBR support?

KW45B41Z52AFPBR supports seven low-power modes, including Deep Power-Down (<1.5 μA with RTC active) and power-down mode (<3 μA with RTC + 32 KB SRAM retention). Its Smart Power Switch enables ultra-low leakage states down to 300 nA, with wake-up via GPIO or internal timer - critical for battery-powered automotive and industrial deployments of KW45B41Z52AFPBR.

Is KW45B41Z52AFPBR pin-compatible with other KW45 variants?

KW45B41Z52AFPBR uses the 40-pin HVQFN (6×6 mm) package and shares identical pinout with all KW45x41Z52xxPBR/PBT variants in the same package size. However, it is not pin-compatible with 48-pin HVQFN variants (e.g., KW45B41Z52AFTBR) due to differing pin counts and assignments - always verify against the official KW45B41Z52AFPBR pinout table before layout.