NXP Semiconductors MC34903CP5EKR2

Overview

MC34903CP5EKR2 from NXP Semiconductors (formerly Freescale) is a System Basis Chip (SBC) integrating a 5.0 V MCU power regulator, high-speed CAN transceiver (ISO 11898-2/5), fail-safe state machine, SPI interface, and three wake-up input pins. It operates from 5.5–28 V supply, consumes ≤35 μA in LP mode with VDD OFF, and targets automotive and industrial ECU power management. Its SOIC-32 exposed-pad package supports robust thermal performance in motor control and robotics applications.

For engineers reviewing the MC34903CP5EKR2 datasheet, MC34903CP5EKR2 pinout, MC34903CP5EKR2 application, or MC34903CP5EKR2 equivalent, key selection criteria include its 5.0 V VDD regulator with 150 mA internal current limit, ISO 11898-5 CAN compliance up to 1 Mb/s, LP-mode quiescent current of 15–35 μA, integrated SAFE output for fault signaling, and support for cyclic sense via I/O-0/I/O-1 in low-power states.

Technical Context

The MC34903CP5EKR2 implements a SMARTMOS-based fail-safe state machine that monitors VDD undervoltage, overcurrent, watchdog timeout, and RST pin integrity-asserting the open-drain SAFE pin LOW on fault detection. Its CAN interface supports bus fault diagnostics including short-to-battery, short-to-ground, and dominant timeout detection per ISO 11898-5.

It features dual supply inputs (VSUP and VSUP2 internally connected), a configurable 5.0 V VDD regulator with external PNP ballasting capability, and SPI-controlled analog monitoring via MUX-OUT for VSENSE, temperature, or internal supply rails. No LIN interface is present-confirmed by device variation table and pin definitions for MC34903P variant.

Key Specifications

Pinout & Package

MC34903CP5EKR2 uses a 32-pin SOIC package with exposed thermal pad (Pb-free, EK suffix). Pin assignments are footprint-compatible across the 34903/4/5 family, enabling design reuse.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC34903CP5EKR2, MC33903CDLR2 adds LIN but increases LP current and requires layout changes, while TC358749XBG reduces cost and current draw but sacrifices fail-safe signaling and external current extension-making MC34903CP5EKR2 optimal for thermally demanding, safety-aware CAN-only ECUs.

Availability

MC34903CP5EKR2 is available at Aetrix Electronics and suitable for industrial motor control, robotics actuator nodes, automotive body control modules, and DIN-rail process controllers requiring stable component supply across extended temperature (-40°C to +125°C) and high-reliability operation.

Supply support for MC34903CP5EKR2 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 analog, power management, and automotive-grade ICs.

The MC34903CP5EKR2 belongs to NXP's System Basis Chip product line, designed specifically for automotive and industrial electronic control units requiring integrated power regulation, CAN communication, fail-safe monitoring, and ultra-low-power sleep modes.

FAQ

What is the maximum operating ambient temperature for the MC34903CP5EKR2?

The MC34903CP5EKR2 is rated for ambient temperatures from –40 °C to +125 °C. Its thermal shutdown activates at 160 °C junction temperature, and continuous operation is specified up to 125 °C junction to ensure 10-year reliability. The SOIC-32 exposed-pad package achieves 50 °C/W thermal resistance on standard dual-layer PCBs, enabling stable operation in enclosed industrial enclosures.

Does the MC34903CP5EKR2 support LIN communication?

No, the MC34903CP5EKR2 does not support LIN communication. It is the "P" variant (MC34903P) in the 34903 family, explicitly defined in Table 3 as having zero LIN interfaces. Pin assignments confirm absence of LIN-T, RXD-L, and TXD-L signals-only CANH, CANL, and three wake-up I/O pins (I/O-0, I/O-1, I/O-3) are present.

How does the SAFE pin function on the MC34903CP5EKR2?

The SAFE pin on the MC34903CP5EKR2 is an open-drain, active-LOW fault indicator. It asserts LOW within 100 μs upon detection of VDD undervoltage, watchdog timeout, RST pin fault, or critical CAN bus error. It remains asserted until cleared by MCU SPI command or power cycle, providing immediate hardware-level fault signaling to external safety circuits or microcontrollers.

Can the MC34903CP5EKR2 operate during automotive cranking conditions?

Yes, the MC34903CP5EKR2 supports cranking with its extended low-voltage range: VSUP can drop to 4.0 V while maintaining VDD regulation and MCU operation. Its VSUP undervoltage detector has hysteresis of 150–180 mV, and the device remains functional down to 4.0 V (though CAN and I/Os are disabled below 5.5 V). This ensures reliable boot and monitoring during engine start.

What external components are required for stable operation of the MC34903CP5EKR2?

The MC34903CP5EKR2 requires a 4.7–100 μF decoupling capacitor on VDD, a 100 nF capacitor on 5V-CAN, and a series resistor on VSENSE for transient protection. For external PNP ballasting, a base resistor between VB and VE and collector capacitor on VCAUX are needed. No external CAN termination or LIN pull-ups are required-the chip integrates all necessary biasing and protection.