NXP Semiconductors MCZ33903B5EK

Overview

MCZ33903B5EK from NXP (formerly Freescale) is a second-generation automotive System Basis Chip (SBC) integrating high-speed CAN transceiver (ISO 11898-2/5), 5.0 V MCU supply regulator (150 mA), internal 5.0 V CAN driver supply, fail-safe state machine, secured SPI with watchdog, and one wake-up input - designed for body control modules, seat modules, and lighting controllers in 12 V automotive systems.

For engineers reviewing the MCZ33903B5EK datasheet, MCZ33903B5EK pinout, MCZ33903B5EK application, or MCZ33903B5EK equivalent, key selection considerations include its 5.0 V VDD output without external ballast support, single-CAN/no-LIN configuration, SOIC-32 exposed pad package, -40 °C to 125 °C operation, and 15 µA sleep current with active CAN/LIN wake capability.

Technical Context

The MCZ33903B5EK implements a fail-safe state machine linked to the SAFE pin, cranking pulse management during low-VDD conditions, and secured SPI with parity checking and windowed timeout. It supports ISO 11898-2/5-compliant CAN physical layer with SPLIT termination and integrated 5.0 V CAN regulator.

Unlike MC33904/905 variants, MCZ33903B5EK provides no VAUX, VSENSE, or MUX functionality and excludes LIN interfaces. Its VDD regulator delivers fixed 5.0 V at up to 150 mA without external PNP support - distinguishing it from scalable 300 mA versions requiring ballast transistors.

Key Specifications

Pinout & Package

MCZ33903B5EK uses a Pb-free 32-pin SOIC wide-body package with exposed thermal pad (98ASA10556D), optimized for automotive thermal cycling and board-level reliability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar System Basis Chip applications.

Compared with MCZ33904B5EK/R2, MCZ33903B5EK offers simpler wake architecture and lower BOM cost; compared with MCZ33903BD5EK/R2, it trades LIN flexibility and scalability for reduced complexity and footprint in CAN-only designs.

Availability

MCZ33903B5EK is available at Aetrix Electronics and suitable for body control modules, seat modules, and lighting control modules requiring stable component supply across automotive production lifecycles.

Supply support for MCZ33903B5EK 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 automotive-grade analog and power management ICs.

The MC33903 family targets automotive electronic control units needing integrated power regulation, CAN communication, and fail-safe supervision - specifically optimized for cost-sensitive, CAN-only body electronics where LIN is not required.

FAQ

What is the maximum output current of the VDD regulator in MCZ33903B5EK?

The MCZ33903B5EK VDD regulator delivers a fixed 5.0 V output with a maximum continuous current of 150 mA. Unlike other variants such as MCZ33903BD5EK/R2, it does not support external ballast transistor implementation for higher current, making it suitable for mid-tier automotive MCUs with moderate power needs. This limitation is inherent to the MCZ33903B5EK silicon configuration and is documented in the MC33903_4_5FS datasheet Rev. 6.0.

Does MCZ33903B5EK support LIN communication?

No, MCZ33903B5EK does not include any LIN transceiver functionality. It belongs to the base MC33903 variant line, which integrates only a high-speed CAN interface and lacks LIN-1 or LIN-2 blocks. The "B5" suffix denotes 5.0 V VDD output and "B" revision enhancements (improved oscillator, VSUP ramp behavior), but no LIN capability. For LIN support, consider MCZ33903BD5EK/R2 or MCZ33904B5EK/R2.

What package type and thermal characteristics does MCZ33903B5EK use?

MCZ33903B5EK uses a Pb-free 32-pin SOIC wide-body package with exposed thermal pad (standard code 98ASA10556D). The exposed pad enhances thermal dissipation in automotive environments, supporting operation from -40 °C to +125 °C ambient. Thermal resistance (θ_JA) is 42 °C/W typical on 2-layer JEDEC boards, enabling reliable performance in compact ECU housings without forced airflow.

How does the fail-safe state machine operate in MCZ33903B5EK?

The MCZ33903B5EK fail-safe state machine is hardware-driven and activated via the SAFE pin, which asserts an open-drain signal during detected faults (e.g., overtemperature, undervoltage, or CAN bus error escalation). It enforces deterministic transitions to preconfigured safe states - such as disabling VDD or asserting RST - without MCU intervention. This behavior is fully defined in the MC33903_4_5FS datasheet and supports ASIL-B compliance when integrated into appropriate system architectures.

Is MCZ33903B5EK compatible with ISO 11898-5 partial networking?

Yes, MCZ33903B5EK's integrated CAN physical layer complies with both ISO 11898-2 (high-speed CAN) and ISO 11898-5 (low-power, partial networking CAN). It supports local wake-up via bus activity while maintaining ultra-low 15 µA sleep current, enabling selective ECU activation without waking the entire network - a requirement for modern vehicle power management strategies.