NXP Semiconductors MC33742EPR2

Overview

MC33742EPR2 from NXP Semiconductors (formerly Freescale) is an automotive-grade System Basis Chip integrating a 1.0 Mbps high-speed CAN transceiver, dual 5.0 V regulators (one internal LDO, one externally augmented), four wake-up inputs, programmable window watchdog, SPI interface, and a high-side switch driver. It operates across -40 °C to 125 °C in 48-pin QFN package and serves as central power management and communication hub in automotive ECUs.

For engineers reviewing the MC33742EPR2 datasheet, MC33742EPR2 pinout, MC33742EPR2 application, or MC33742EPR2 equivalent, this page delivers verified electrical specs, mode timing, CAN bus diagnostic thresholds, regulator dropout behavior, and thermal shutdown limits - all critical for ECU power architecture validation and ISO 11898-2 compliance.

Technical Context

The MC33742EPR2 implements a multi-mode state machine (Normal, Standby, Stop, Sleep) with configurable wake-up sources (L0–L3, CAN, cyclic sense), enabling ultra-low-current operation down to 55 µA in Sleep mode with wake-up enabled. Its CAN transceiver supports bus fault detection via VLG, VHG, VLVB, VHVB, VL5, and VH5 diagnostic thresholds.

Regulation is split between a fixed 5.0 V/200 mA internal LDO (VDD) with overtemperature prewarning at 125 °C and thermal shutdown at 160 °C, and a second 5.0 V rail (V2) generated using external PNP pass transistor driven by V2CTRL - supporting CAN transceiver supply and external circuitry with 10 mA drive capability.

Key Specifications

Pinout & Package

MC33742EPR2 is housed in a 48-pin QFN package (9 mm × 9 mm, 0.5 mm pitch) with exposed thermal pad. Pin definitions are validated per Freescale Document Number MC33742 Rev. 15.0, Figures 4 and Table 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar system basis chip applications.

Compared with MC33816EPR2, MC33742EPR2 trades LIN capability and advanced diagnostics for lower cost and proven maturity in legacy ECU designs; versus TCANI10G, it eliminates six external components (regulator, reset IC, watchdog, HS driver, SPI interface, and power sequencing logic), significantly reducing design risk and qualification effort.

Availability

MC33742EPR2 is available at Aetrix Electronics and suitable for automotive body control, engine management, ADAS sensor hubs, and electric power steering systems requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for MC33742EPR2 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 automotive, industrial, IoT, and communications applications, with deep expertise in automotive electronics and functional safety.

The MC33742EPR2 belongs to NXP's System Basis Chip product line, engineered specifically for automotive electronic control units requiring integrated power regulation, high-speed CAN communication, and robust fault management in harsh environments.

FAQ

What is the maximum allowable VSUP voltage for continuous operation of the MC33742EPR2?

The MC33742EPR2 supports continuous operation with VSUP from 5.5 V to 27 V. It tolerates transient load dump events up to 40 V per ISO 7637-2, making it suitable for 12 V and 24 V automotive battery systems. Operation outside these ranges risks permanent damage or undefined behavior.

Does the MC33742EPR2 support CAN FD or only classical CAN 2.0?

The MC33742EPR2 supports only classical CAN 2.0B protocol at up to 1.0 Mbps. It does not implement CAN FD physical layer signaling or data-rate switching. Its transceiver complies strictly with ISO 11898-2 for high-speed CAN, with no documented support for FD frame formats or arbitration/data phase bitrate separation.

How does the V2 regulator function in the MC33742EPR2, and what external components are required?

The MC33742EPR2's V2 regulator is implemented externally using a PNP bipolar junction transistor driven by the V2CTRL pin, with V2 serving as the sense input. Required components include a ballast transistor (e.g., MJD32C), a 2.2 kΩ base-emitter resistor, and ≥10 µF tantalum capacitor at V2. This configuration generates a second 5.0 V rail for CAN transceiver supply or auxiliary circuitry.

What is the typical current consumption of the MC33742EPR2 in Sleep mode with wake-up enabled?

In Sleep mode with wake-up enabled and oscillator disabled, the MC33742EPR2 draws 55 µA 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-backed operation in always-on vehicle networks such as alarm systems or telematics gateways.

Can the MC33742EPR2 be used in ASIL-B compliant systems?

Yes - the MC33742EPR2 supports ASIL-B development through integrated safety mechanisms: programmable window watchdog with four timeout periods, overtemperature prewarning (125 °C), thermal shutdown (160 °C), BATFAIL flag, and comprehensive CAN bus diagnostics. While the device itself is not ASIL-certified, its features align with ISO 26262 requirements for fault detection and mitigation in safety-related ECU subsystems.