MC33999EK

Overview

The MC33999EK is a 16-output low-side power switch IC from NXP Semiconductors, designed for automotive applications. It operates within a supply voltage range of 5 V to 27 V and features an SOIC-EP-54 package. Each output provides a maximum continuous current of 350 mA, with current limiting adjustable between 900 mA and 2.5 A. The device includes a typical on-resistance (RDS(ON)) of 550 mOhms at 25°C. Switching times are specified with a maximum turn-on time of 10 µs and a maximum turn-off time of 10 µs. The unit supports an operating temperature range from -40°C to +125°C and dissipates up to 1.7 W of power.

Feature Summary

• Integrates 16 open-drain MOSFET outputs controlled via a 24-bit Serial Peripheral Interface (SPI) for comprehensive input control and diagnostic readout capabilities.
• Supports direct Pulse Width Modulation (PWM) control through eight parallel inputs for dedicated outputs and an additional programmable PWM input for any output combination.
• Incorporates SMARTMOS technology to provide robust protection against over-current, over-temperature, and over/under-voltage conditions while ensuring low power dissipation.

Applications

• Automotive Diesel Engine Management systems
• Valve Driver circuits
• Inductive load switching
• Incandescent lamp control
• LED load driving

Procurement Notes

Verify the component status carefully as this part number may be subject to obsolescence or end-of-life restrictions. Confirm that the SOIC-EP-54 package and exposed pad thermal requirements align with your PCB design. Ensure compatibility with 3.3 V or 5.0 V SPI logic levels. Check for moisture sensitivity classification if storage conditions are critical. Validate that the current limiting settings meet the specific load requirements for incandescent or inductive applications.

Selection Notes

Select this IC when a high-channel count low-side switch with integrated diagnostics is required. It is suitable for designs needing both serial control flexibility and direct PWM hardware inputs. Consider the thermal performance of the exposed pad package for high-power dissipation scenarios. Ensure the application voltage stays within the 5 V to 27 V operational window. Verify that the output current limits accommodate the inrush currents of connected loads.

Part Context

This component belongs to the MC33999 series of low-side switches, which are part of NXP's portfolio for engine control and power distribution. It complements other automotive analog and mixed-signal ICs by providing reliable load switching with advanced fault detection. The series is designed to meet automotive quality standards for durability and performance in harsh environments.

Replacement Considerations

Public confirmed substitute part numbers include MCZ33999EKR2 and MCZ33999EK. These variants share identical functional specifications but differ in packaging format, such as reel versus tube. Verify pinout compatibility and thermal characteristics before substitution.