NXP Semiconductors MC33742DWR2

Overview

MC33742DWR2 from NXP Semiconductors (formerly Freescale) is an automotive-grade System Basis Chip (SBC) 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 high-side switch output. It serves as the central power management and communication hub in automotive ECUs, enabling robust operation across Normal, Standby, Stop, and Sleep modes with ultra-low quiescent current in Sleep mode (≤85 µA).

For engineers reviewing the MC33742DWR2 datasheet, MC33742DWR2 pinout, MC33742DWR2 application, or MC33742DWR2 equivalent, this device is selected for ECU designs requiring integrated CAN physical layer, fault-tolerant voltage regulation, low-power state management, and diagnostic-ready wake-up capability under ISO 7637-1 transient conditions.

Technical Context

The MC33742DWR2 implements a fully protected 5.0 V/200 mA LDO regulator with overtemperature prewarning (125 °C), thermal shutdown (160 °C), current limiting, and reset generation - all monitored via SPI-accessible status registers. Its CAN transceiver complies with ISO 11898-2 and supports bus diagnostics including CANH/CANL voltage threshold detection (e.g., VL5 = VDD − 0.43 V, VH5 = VDD − 0.43 V) and dominant/recessive state monitoring.

Operation is governed by a state machine with four defined modes: Normal (full functionality), Standby (reduced current, CAN active), Stop (VDD on, CAN sleep, wake-up enabled), and Sleep (VDD/V2 off, oscillator optional). Mode transitions are controlled via SPI commands or hardware events (e.g., wake-up inputs L0–L3, CAN bus activity), with precise timing guarantees - e.g., t_{S-CAN_N} ≤ 10 µs delay from SPI command to CAN Normal mode entry.

Key Specifications

Pinout & Package

MC33742DWR2 is packaged in a 28-pin SOICW (wide-body) with exposed thermal pad, optimized for automotive thermal cycling and PCB reliability. Pin assignments follow the 28-pin SOICW footprint defined in Freescale Document 98ASB42345B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC33742DWR2, MC33883DWR2 offers CAN FD readiness and wider thermal tolerance but requires layout changes; TCANI2G reduces BOM count only in architectures that decentralize power and control functions - neither is pin-compatible nor drop-in replaceable.

Availability

MC33742DWR2 is available at Aetrix Electronics and suitable for automotive body electronics, powertrain control units, and ADAS sensor hubs requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for MC33742DWR2 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 secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in automotive-grade analog and mixed-signal ICs.

The MC33742DWR2 belongs to NXP's System Basis Chip product line, designed specifically to consolidate power management, communication, and safety-critical monitoring functions into a single IC for automotive electronic control units.

FAQ

What is the maximum allowed supply voltage at the VSUP pin for MC33742DWR2?

The MC33742DWR2 supports a continuous VSUP voltage range of -0.3 V to 27 V, with transient load dump tolerance up to 40 V per ISO 7637-1. Exceeding 40 V may cause permanent damage. The device operates functionally across 5.5 V to 18 V nominal, with reduced functionality down to 4.5 V.

Does MC33742DWR2 support CAN FD or only classical CAN?

The MC33742DWR2 supports only classical CAN 2.0B at up to 1.0 Mbps. It does not implement CAN FD protocol features such as variable bit rate or extended data length. For CAN FD, consider NXP's MC33883DWR2 or standalone transceivers like TJA1044T.

How is the reset duration configured for MC33742DWR2?

The MC33742DWR2 has a fixed reset pulse duration of 15 ms (typical) upon power-up, VDD undervoltage, or watchdog timeout. This value is not user-programmable and differs from the 3.5 ms reset of the MC33742S variant. Configuration is determined by internal circuitry, not SPI registers.

Can MC33742DWR2 drive a 500 mA load directly using its HS pin?

No. The HS pin of MC33742DWR2 is internally current-limited to 160–500 mA depending on temperature and supply voltage, with typical turn-on current of 150 mA. Driving 500 mA continuously risks thermal shutdown (TSD = 155 °C). For higher loads, use the HS pin to control an external MOSFET or relay driver.

What external components are required for stable operation of the V2 regulator in MC33742DWR2?

For stable V2 regulation, MC33742DWR2 requires an external PNP bipolar junction transistor (e.g., MJD32C), a 2.2 kΩ base-emitter resistor, and ≥10 µF tantalum capacitor at V2. The V2CTRL pin drives the transistor base; V2 pin senses emitter voltage. Capacitor ESR must be <1.3 Ω to ensure loop stability.