NXP Semiconductors MC34903CP3EK

Overview

MC34903CP3EK from NXP Semiconductors (formerly Freescale) is a System Basis Chip (SBC) integrating a 3.3 V MCU power regulator, high-speed CAN transceiver (ISO 11898-2/5), fail-safe state machine, and three wake-up input pins. It operates across -40°C to +125°C, supports 40 kb/s–1 Mb/s CAN baud rates, and delivers ≤35 μA quiescent current in LP mode with VDD ON. Used in automotive ECU power management for motor control modules requiring robust bus diagnostics and low-power operation.

For engineers reviewing the MC34903CP3EK datasheet, MC34903CP3EK pinout, MC34903CP3EK application, or MC34903CP3EK equivalent, this page provides verified technical context, validated pin functions, confirmed low-power behavior, real-world diagnostic capabilities (CAN bus fault detection, VDD undervoltage monitoring), and direct alternative part comparisons - all specific to the MC34903CP3EK/R2 variant.

Technical Context

The MC34903CP3EK implements a SMARTMOS-based power management architecture with dual supply inputs (VSUP and VSUP2 internally disconnected), a configurable 3.3 V VDD regulator (150 mA internal limit, extendable via external PNP), and integrated ISO 11898-5-compliant CAN physical layer. Its fail-safe state machine monitors RST, VDD, watchdog timeout, and SAFE output assertion.

It supports four low-power (LP) modes: VDD OFF (≤35 μA), VDD ON with cyclic sense (≤65 μA), debug mode (DBG pin at 8–10 V), and SPI-controlled wake-up sources including CAN bus activity, I/O transitions, and timer events - all confirmed for the P3EK variant per Device Variations Table 3.

Key Specifications

Pinout & Package

MC34903CP3EK uses a 32-pin SOIC package with exposed thermal pad (EK suffix = Pb-free). Pin compatibility is maintained across the 34903/4/5 family, but MC34903CP3EK omits LIN interface pins (LIN, TXD-L, RXD-L) and VAUX output, distinguishing it from S-variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC34903CP3EK, MC33903DP3EK offers higher CAN speed and lower quiescent current but requires layout change, while TLF35584QVVS1 adds LIN and safety certification at the cost of higher complexity and no pin compatibility - making MC34903CP3EK optimal for cost-sensitive, CAN-only, legacy-qualified automotive and industrial applications.

Availability

MC34903CP3EK is available at Aetrix Electronics and suitable for motor control ECUs, industrial PLC I/O modules, automotive body control units, and robotics actuator nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC34903CP3EK 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 heritage in automotive analog and power management ICs.

The MC34903 series belongs to NXP's System Basis Chip product line, designed specifically for automotive electronic control units requiring integrated power regulation, high-speed CAN, fail-safe monitoring, and ultra-low-power sleep modes - targeting cost-optimized, high-reliability ECU implementations.

FAQ

What is the maximum CAN baud rate supported by the MC34903CP3EK?

The MC34903CP3EK supports high-speed CAN up to 1.0 Mb/s, fully compliant with ISO 11898-2 and ISO 11898-5 standards. This capability is confirmed in the Functional Description section and Electrical Characteristics tables of the official MC34903_4_5 datasheet (Rev. 4.0, Oct 2013). The device maintains signal integrity and fault detection across the full 40 kb/s to 1 Mb/s range without external components.

Does the MC34903CP3EK include a LIN interface?

No, the MC34903CP3EK does not include a LIN interface. Per Table 3 (MC34903 Device Variations), the "P" suffix denotes the zero-LIN variant - confirming absence of LIN, TXD-L, RXD-L, and LIN-T pins. This distinguishes it from MC34903S variants. The MC34903CP3EK provides three wake-up I/O pins (I/O-0, I/O-2, I/O-3) instead of LIN functionality.

What is the quiescent current of the MC34903CP3EK in low-power mode with VDD enabled?

In low-power mode with VDD enabled, the MC34903CP3EK draws 20–65 μA depending on temperature and configuration, as specified in Table 6 (Static Electrical Characteristics). At −40°C to 25°C with 100 μA IDD, typical current is 40 μA; at 125°C, it rises to 65 μA. This includes oscillator current for cyclic sense and wake-up monitoring - verified for the P3EK variant.

Can the MC34903CP3EK drive an external PNP transistor to increase VDD current capability?

Yes, the MC34903CP3EK supports external PNP ballasting for the VDD regulator. Pins VB (base) and VE (emitter) provide dedicated connections to an external PNP pass transistor, enabling total output current beyond the internal 150 mA limit. The datasheet specifies a ballast current ratio K = 1.5–2.5 and confirms 200 mA total capability with external transistor - validated in the VDD regulator section.

What package type and lead finish does the MC34903CP3EK use?

The MC34903CP3EK uses a 32-pin SOIC package with exposed thermal pad and Pb-free (RoHS-compliant) finish, indicated by the "EK" suffix per Freescale's packaging documentation. This matches the footprint of other 34903/4/5 family members but excludes LIN-related pins. Thermal resistance RθJA is 50°C/W under defined PCB conditions (Figure 9).