NXP Semiconductors MCZ33742SEG

Overview

MCZ33742SEG from NXP Semiconductors (formerly Freescale) is a SPI-controlled System Basis Chip (SBC) integrating a 1.0 Mbps CAN 2.0-compliant transceiver, dual 5.0 V regulators (one internal LDO, one external PNP-driven), high-side switch, programmable watchdog, and four wake-up inputs - designed for automotive ECU power management and communication. It operates across -40 °C to 125 °C and supports Normal, Standby, Stop, and Sleep modes with sub-100 µA sleep current.

For engineers reviewing the MCZ33742SEG datasheet, MCZ33742SEG pinout, MCZ33742SEG application, or MCZ33742SEG equivalent, this page delivers verified technical context, exact pin functions per 28-pin SOICW package, real-world automotive use cases, and two validated alternative SBCs with documented functional and timing differences.

Technical Context

The MCZ33742SEG implements a multi-mode state machine controlled via SPI (up to 4.0 MHz), with dedicated hardware for CAN bus diagnostics, VDD/V2 voltage monitoring, BATFAIL flag generation, and over-temperature prewarning at 125 °C. Its internal oscillator runs at 100 kHz for low-power cyclic sense and forced wake-up timing.

It features dual independent regulator control paths: the primary 5.0 V/200 mA LDO supplies MCU logic (VDD), while the V2CTRL/V2 interface drives an external PNP transistor to generate a second 5.0 V rail for CAN transceiver biasing - both regulated with dropout < 0.5 V at full load and line/load regulation ≤ 75 mV.

Key Specifications

Pinout & Package

MCZ33742SEG is packaged in a 28-pin SOICW (wide-body) with Pb-free finish (EG suffix), footprint 17.9 mm × 7.5 mm, thermal resistance R_θJG = 20 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCZ33742SEG, MC33816PAE offers expanded protocol support and tighter integration but requires PCB redesign and firmware adaptation; TC358749XBG serves unrelated video routing and must be excluded from SBC selection.

Availability

MCZ33742SEG is available at Aetrix Electronics and suitable for automotive body control modules, engine control units, ADAS camera ECUs, and electric power steering systems requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.

Supply support for MCZ33742SEG 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 applications, with deep expertise in automotive-grade analog and mixed-signal ICs.

The MCZ33742SEG belongs to NXP's System Basis Chip product line, engineered specifically for automotive electronic control units requiring integrated power management, CAN communication, and robust fault handling in extreme temperature environments.

FAQ

What is the maximum CAN bus data rate supported by the MCZ33742SEG?

The MCZ33742SEG supports a maximum CAN bus data rate of 1.0 Mbps, fully compliant with ISO 11898-2 for high-speed CAN communication in automotive ECUs. This rate is achieved with differential output voltage ≥1.5 V in dominant state and ≥100 mV hysteresis, ensuring robust noise immunity on twisted-pair bus lines. The MCZ33742SEG does not support CAN FD or higher-speed protocols.

Does the MCZ33742SEG include an internal voltage regulator for the MCU?

Yes, the MCZ33742SEG integrates a fixed 5.0 V low-dropout (LDO) regulator delivering up to 200 mA to the MCU via the VDD pin. It features current limiting, overtemperature prewarning at 125 °C, and reset assertion on undervoltage. Dropout voltage is 0.2 V typical at 200 mA load, and line/load regulation remains within ±75 mV across operating conditions - all critical for stable MCU operation in automotive environments. The MCZ33742SEG also supports a second 5.0 V rail via external PNP transistor driven by V2CTRL/V2.

How many wake-up inputs does the MCZ33742SEG provide, and what is their voltage threshold range?

The MCZ33742SEG provides four dedicated wake-up inputs: L0, L1, L2, and L3. Each accepts DC input voltages from -0.3 V to 40 V and features programmable hysteresis (0.6–1.3 V). Thresholds vary with VSUP: for VSUP = 6–18 V, low-threshold is 2.5–3.0 V and high-threshold is 3.3–4.0 V. These inputs enable reliable detection of external switch closures or logic-level signals to exit Sleep or Stop modes - a key requirement for always-on automotive ECUs. The MCZ33742SEG does not support analog sensing or ADC functionality on these pins.

What is the typical supply current of the MCZ33742SEG in Sleep mode with wake-up enabled?

In Sleep mode with CAN wake-up enabled and oscillator disabled, the MCZ33742SEG draws 55 µA typical at 125 °C, 65 µA at 25 °C, and 80 µA at -40 °C - measured at the VSUP pin. This ultra-low quiescent current enables extended battery life in ignition-off scenarios such as remote keyless entry or intrusion detection. The MCZ33742SEG achieves this via internal clock gating, regulator shutdown (VDD and V2 OFF), and selective peripheral disablement while retaining wake-up sensitivity on L0–L3 and CAN bus.

Is the MCZ33742SEG pin-compatible with the MC33742S variant?

No, the MCZ33742SEG is not pin-compatible with the MC33742S variant. While both share identical 28-pin SOICW packaging and pin assignments, they differ in reset duration (15 ms typical for MCZ33742SEG vs. 3.5 ms for MC33742S) and internal timing behavior during power-up and watchdog timeout. These differences affect system-level reset coordination and require firmware validation. The MCZ33742SEG and MC33742S are functionally similar but not drop-in replacements - board layout may be identical, but software timing assumptions must be reverified.