NXP Semiconductors MCZ33903C3EK

Overview

MCZ33903C3EK from NXP (formerly Freescale) is a second-generation System Basis Chip (SBC) designed as an automotive power management and communication interface unit for MCU-based ECUs in body, safety, and powertrain systems. It integrates a 5.0 V/150 mA MCU voltage regulator (VDD), high-speed CAN transceiver (ISO 11898-2/5 compliant), secured SPI with watchdog, fail-safe state machine, and one wake-up input - all in a 32-pin SOIC exposed-pad package operating from −40 °C to 125 °C.

For engineers reviewing the MCZ33903C3EK datasheet, MCZ33903C3EK pinout, MCZ33903C3EK application, or MCZ33903C3EK equivalent, key selection criteria include its 5.0 V VDD output without external ballast support, single CAN interface with ±8 kV ESD protection, ultra-low 15 µA sleep current with VDD off, and compatibility with S12x/MPC560x MCUs in gateways and seat modules.

Technical Context

The MCZ33903C3EK implements a fail-safe state machine linked to the SAFE pin, enabling configurable degraded operation during fault conditions. Its CAN physical layer supports data rates from 40 kB/s to 1.0 MB/s and includes bus failure diagnostics, local/remote wake-up detection, and split termination support.

It features a secured SPI interface with parity checking and windowed watchdog capability, plus high-precision VSUP sensing for cranking pulse management. Unlike MC33903D/S variants, this part lacks VAUX, VSENSE, and MUX functionality - confirming its minimal-feature configuration within the MC33903 family.

Key Specifications

Pinout & Package

MCZ33903C3EK is housed in a Pb-free 32-pin SOIC wide-body package with exposed thermal pad (suffix EK), optimized for automotive PCB thermal dissipation and reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCZ33903B3EK and MCZ33904C3EK, the MCZ33903C3EK delivers optimal balance of 5.0 V MCU support, CAN compliance, and ultra-low sleep current in the smallest 32-pin SOIC footprint - making it ideal for cost-sensitive, space-constrained body ECU designs where single-wake capability suffices.

Availability

MCZ33903C3EK is available at Aetrix Electronics and suitable for body controller, seat module, door module, and lighting control applications requiring stable component supply across automotive production lifecycles.

Supply support for MCZ33903C3EK 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 leader in automotive semiconductors, delivering SMARTMOS-based analog, power, and mixed-signal ICs for safety-critical and high-reliability vehicle systems.

The MC33903 family was engineered as a Gen2 System Basis Chip targeting cost-optimized, CAN-centric ECUs in body electronics - emphasizing low quiescent current, fail-safe behavior, and seamless integration with Freescale/NXP MCU platforms.

FAQ

What is the maximum output current capability of the VDD regulator in MCZ33903C3EK?

The MCZ33903C3EK provides a fixed 5.0 V VDD output rated for up to 150 mA continuous current. Unlike higher-current variants (e.g., MC33903D), this part does not support external PNP ballast transistor implementation, so the 150 mA limit is absolute and must be respected in MCU + peripheral load calculations. Exceeding this current may cause VDD droop or thermal shutdown.

Does MCZ33903C3EK support LIN communication?

No, MCZ33903C3EK does not integrate any LIN transceiver or LIN master terminal outputs. It belongs to the base MC33903 variant group (non-D/non-S suffix), which includes only CAN interface, one wake-up input, and no LIN or auxiliary regulation features. For LIN-capable alternatives, consider MCZ33903BS3EK or MCZ33903BD3EK.

What package type and thermal characteristics does MCZ33903C3EK use?

MCZ33903C3EK is packaged in a Pb-free 32-pin SOIC wide-body (SOICW) with exposed thermal pad (suffix EK). The exposed pad enhances thermal conduction to the PCB, supporting operation up to +125 °C ambient. Its thermal resistance θ_JA is 45 °C/W typical on 2-layer JEDEC standard board, enabling reliable performance in under-dash and door module environments.

How does the fail-safe state machine operate in MCZ33903C3EK?

The MCZ33903C3EK implements a hardware-based fail-safe state machine that monitors VSUP, VDD, temperature, and internal errors. On fault detection, it asserts the open-drain SAFE pin and can force RST low to reset the MCU. Behavior is configurable via external resistor networks on pins like RSTTIME and UVTH, allowing OEMs to define custom safe states without firmware dependency.

Is MCZ33903C3EK compatible with NXP's evaluation boards?

Yes, MCZ33903C3EK is supported by the KIT33903BD3EVBE and KIT33903BD5EVBE evaluation boards, both designed for the MC33903 family. These kits provide full SPI access, CAN bus connectivity, debug interfaces, and test points for measuring VDD, VSUP, and SAFE pin behavior - enabling rapid validation of MCZ33903C3EK in target ECU configurations.