NXP Semiconductors MC33289DWR2

Overview

MC33289DWR2 from Freescale Semiconductor is a dual high-side switch IC designed for automotive inductive load control, featuring two independent 40 mΩ R_DS(ON) MOSFET channels (25°C), 6–27 V operating range, and integrated overcurrent/overvoltage/undervoltage/overtemperature protection with open-load detection. It interfaces directly with microcontrollers via CMOS-compatible inputs and active-low diagnostic status outputs.

For engineers reviewing the MC33289DWR2 datasheet, MC33289DWR2 pinout, MC33289DWR2 application, or MC33289DWR2 equivalent, key selection considerations include its 20-pin SOICW package, dual-channel fault isolation, standby current <5.0 µA, and automotive-grade thermal shutdown at 150–175°C with 10°C hysteresis.

Technical Context

The MC33289DWR2 implements two independent high-side power switches with dedicated charge-pump gate drivers, enabling robust control of solenoid valves and other inductive loads without external flyback diodes. Each channel integrates separate overcurrent sensing, thermal shutdown with hysteresis, and open-load detection enabled by the OLDE pin.

Its protection architecture includes voltage lockout (UVLO: 4.75–6.0 V, OVLO: 27–38 V), negative inductive clamp (–4.0 to –1.0 V), and fast fault response-overcurrent latchoff delay ≤30 µs and open-load-to-status-low delay ≤100 µs-ensuring system reliability in harsh automotive environments.

Key Specifications

Pinout & Package

MC33289DWR2 uses a 20-pin SOICW (wide-body) surface-mount package (package code DW, drawing 98ASB42343B), optimized for thermal dissipation with multiple V_BAT pins connected directly to the MOSFET drain leads and the lead frame.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-side switch applications.

Compared with TPS2HB35-Q1 and VNQ7E100AJTR, the MC33289DWR2 delivers lower R_DS(ON) and ultra-low standby current but lacks programmability and analog current sensing-making it optimal for cost-sensitive, fixed-threshold automotive load switching where minimal quiescent power is critical.

Availability

MC33289DWR2 is available at Aetrix Electronics and suitable for automotive solenoid control, body control modules, engine start-stop systems, and commercial vehicle valve control requiring stable component supply across extended temperature and voltage ranges.

Supply support for MC33289DWR2 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

Freescale Semiconductor (now part of NXP Semiconductors) was a leading designer of automotive and industrial analog/mixed-signal ICs, known for robust power management and interface solutions.

The MC33289DWR2 belongs to Freescale's automotive-grade analog power switch product line, engineered specifically for protected high-side driving of inductive loads in safety-critical vehicle subsystems.

FAQ

What is the maximum continuous output current supported by the MC33289DWR2?

The MC33289DWR2 does not specify a single maximum continuous output current rating; instead, its safe operating current depends on thermal conditions and PCB layout. At 25°C ambient with adequate copper pour, each channel can sustain ≥5 A continuously due to its 40 mΩ R_DS(ON). However, overcurrent protection triggers at 4.0–9.0 A, and thermal shutdown activates at 150–175°C junction temperature-so actual current capability must be validated per board-level thermal design using the R_THJA = 70°C/W specification.

Does the MC33289DWR2 require external flyback diodes for inductive load switching?

No, the MC33289DWR2 includes an integrated negative inductive clamp with V_CLAMP = –4.0 to –1.0 V, which safely dissipates energy from solenoid or relay coils during turn-off. This eliminates the need for external flyback diodes in most automotive applications, reducing BOM count and PCB footprint while ensuring consistent clamping performance across temperature and voltage variations.

How does the OLDE pin affect the functionality and power consumption of the MC33289DWR2?

The OLDE pin enables or disables the open-load detection current source: when held logic-low, the diagnostic circuitry is powered down, reducing total supply current to <5.0 µA in standby mode; when logic-high, the device draws additional bias current to generate the 200–400 µA test current for open-load detection. This selective activation allows system designers to conserve power during non-diagnostic periods while retaining full fault coverage when needed.

Can the MC33289DWR2 be used in non-automotive applications such as industrial PLC outputs?

Yes, the MC33289DWR2 is technically suitable for industrial applications requiring dual high-side switching with robust protection-its 6–27 V operating range, –40°C to 125°C ambient rating, and 40 mΩ R_DS(ON) meet many PLC output module requirements. However, its automotive-qualified design (e.g., AEC-Q100 stress testing, ISO 16750 transient immunity) provides margin beyond typical industrial specs, though users must verify compatibility with their specific EMC and safety certification requirements.

What is the purpose of the multiple VBAT pins on the MC33289DWR2 package?

The eight V_BAT pins (1,2,5,6,15,16,19,20) serve dual functions: they provide low-impedance power delivery to both MOSFET channels and act as primary thermal conduction paths from the die to the PCB. By connecting these pins directly to large copper areas, designers achieve lower effective R_THJA and improved power handling-critical for sustaining high-current loads without exceeding the 150–175°C thermal shutdown threshold.