NXP Semiconductors MC33289DW

Overview

MC33289DW 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, overtemperature shutdown (150–175°C), overcurrent latch-off (4.0–9.0 A), and open-load detection with OLDE pin control. It operates from 6.0 V to 27 V and drives solenoid valves in engine management and body control modules.

For engineers reviewing the MC33289DW datasheet, MC33289DW pinout, MC33289DW application, or MC33289DW equivalent, key selection criteria include channel independence, diagnostic flag timing (T_OLSTDT = 100 µs), standby current (<5.0 µA), thermal resistance (R_THJL1 = 15 °C/W), and SOICW-20 package compatibility with automotive PCB layout constraints.

Technical Context

The MC33289DW integrates two separate high-side power switches with dedicated charge-pump gate drivers, enabling direct microcontroller interface via CMOS-compatible IN1/IN2 inputs. Each channel includes independent fault monitoring-overcurrent, overvoltage (27–38 V shutdown), undervoltage (4.75–6.0 V), open-load (I_OL = 200–400 µA), and thermal shutdown with 10°C hysteresis.

Its internal architecture features open-drain ST1/ST2 status outputs with external pull-up requirement, OLDE-controlled bias current reduction, and negative inductive clamp (–4.0 to –1.0 V) for solenoid flyback protection. The device uses shared VBAT pins (pins 1,2,5,6,15,16,19,20) for both power delivery and thermal conduction to PCB.

Key Specifications

Pinout & Package

MC33289DW is housed in a 20-pin SOICW (wide-body surface-mount) package (suffix DW), with exposed thermal pad connected internally to VBAT pins for enhanced heat dissipation. Pin layout supports dual-channel symmetry and dedicated diagnostic signaling.

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 VNQ5E025AKTR-E, the MC33289DW provides simpler parallel GPIO control, lower standby current, and dedicated OLDE pin for bias optimization-making it optimal for cost-sensitive, non-SPI automotive modules needing deterministic fault reporting without software overhead.

Availability

MC33289DW is available at Aetrix Electronics and suitable for engine control valves, transmission solenoid drivers, and body control module loads requiring stable component supply across extended temperature ranges (–40°C to +125°C) and automotive-grade reliability.

Supply support for MC33289DW 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 was a leading designer of automotive and industrial semiconductors, later acquired by NXP Semiconductors in 2015. Its analog power IC portfolio emphasized robustness, integration, and functional safety compliance.

The MC33289DW belongs to Freescale's automotive high-side switch family, engineered specifically for solenoid and resistive load control in harsh environments where thermal resilience, diagnostic integrity, and load-dump immunity are mandatory.

FAQ

What is the maximum continuous V_BAT voltage rating for the MC33289DW?

The MC33289DW has a maximum continuous V_BAT rating of 41 V, as specified in its Absolute Maximum Ratings table. This allows operation under automotive load-dump conditions per ISO 7637-2 Pulse 5a without external clamping. The device remains functional across its full operating range of 6.0 V to 27 V, with overvoltage shutdown activating at 27–38 V to protect downstream loads.

How does the OLDE pin affect the quiescent current of the MC33289DW?

When the OLDE pin is driven logic low, the MC33289DW disables its open-load detection current source, reducing total supply current to less than 5.0 µA at V_BAT < 14 V and T_J < 125°C. This feature is essential for always-on automotive modules where standby power budget is constrained. With OLDE high, bias current increases to support diagnostic functionality.

Can the MC33289DW drive inductive loads without an external flyback diode?

Yes-the MC33289DW incorporates an internal negative inductive clamp that limits V_OUT to –4.0 V during flyback events. This eliminates the need for external freewheeling diodes when driving typical solenoid valves, simplifying PCB layout and reducing BOM cost. The clamp operates automatically during turn-off and is rated for I_OUT = 1 A.

What is the thermal resistance from junction to lead (R_THJL) for the MC33289DW in SOICW-20 package?

The MC33289DW has a thermal resistance of 15 °C/W from junction to lead when both channels are active (R_THJL1), and the same value applies when only one channel is active (R_THJL2). This low value is achieved via multiple VBAT pins tied directly to the MOSFET drain and lead frame, enabling efficient heat transfer to the PCB copper pour-critical for sustained 2 A+ load operation in confined automotive enclosures.

Does the MC33289DW support independent fault reporting for each channel?

Yes-the MC33289DW provides fully independent status reporting via ST1 and ST2 pins, each configured as an open-drain output with internal 6.0 V clamp. Each pin asserts low during channel-specific faults including overtemperature, overcurrent, open-load (off-state), overvoltage, or undervoltage. This enables precise root-cause identification in dual-load systems without shared diagnostic ambiguity.