MC33879EK

Overview

The MC33879EK is an eight-output hardware-configurable high-side/low-side switch featuring a 16-bit serial peripheral interface (SPI) for control and fault reporting. It supports supply voltages from 5.5 V to 26.5 V and operates with 3.3 V or 5.0 V logic inputs. The device incorporates SMARTMOS technology, integrating CMOS logic, bipolar/MOS analog circuitry, and DMOS power MOSFETs. Two outputs allow direct microprocessor PWM control. Key electrical parameters include a typical on-resistance of 0.75 Ohms at 25°C, output current limits ranging from 0.6 A to 1.2 A for incandescent loads, and voltage clamps of +45 V for low-side and -20 V for high-side inductive switching.

Feature Summary

• Hardware-configurable eight-channel architecture supporting both high-side and low-side load switching
• Integrated SMARTMOS technology combining digital logic with DMOS power stages
• Built-in protection mechanisms including short-circuit detection with automatic retry and independent overtemperature shutdown
• Direct microprocessor interface capability for two channels enabling pulse-width modulation applications

Applications

• Automotive engine management systems requiring multi-channel load control
• Inductive load switching for automotive valves and solenoids
• Incandescent lamp driving circuits with current limiting capabilities
• LED load control applications utilizing open-load detect features

Procurement Notes

Verify the specific suffix EK against the manufacturer's latest datasheet revision to confirm package type and lead-free status. Ensure compatibility with the target system's SPI voltage levels and thermal requirements. Cross-reference part numbers with authorized distributors to avoid obsolete variants. Confirm RoHS compliance documentation matches the procurement batch. Validate that the selected component meets the functional safety standards required for the intended automotive or industrial application.

Selection Notes

Select this component when a single IC must manage multiple high-current loads with individual diagnostic feedback. The hardware configurability reduces board space compared to discrete solutions. Consider the thermal performance given the typical on-resistance and expected load currents. Verify that the 16-bit SPI interface aligns with the microcontroller's available peripherals. Evaluate the need for direct PWM control on two channels versus software-generated signals for the remaining six outputs.

Part Context

This device belongs to NXP's family of configurable serial switches designed for robust automotive environments. It utilizes SMARTMOS technology to integrate control logic and power stages into a single package. The series supports various load types including inductive, resistive, and LED loads. It provides comprehensive fault reporting through its serial interface, enabling system-level diagnostics and maintenance.

Replacement Considerations

Check for updated revisions within the MC33879 family that may offer improved thermal characteristics or updated packaging options. Verify pin-to-pin compatibility if substituting with other octal switches from the same manufacturer. Ensure any alternative device maintains the required 16-bit SPI protocol and voltage clamp specifications for inductive loads.