ULQ2004A

Overview

The ULQ2004A is a high-voltage, high-current Darlington transistor array manufactured by STMicroelectronics. It integrates seven independent NPN Darlington pairs within a single package, each featuring open-collector outputs with common emitters. The device supports an output voltage of 50 V and provides a continuous collector current of 500 mA per channel, with peak currents reaching 600 mA. Each pair includes an integrated suppression diode for inductive load protection. The component operates across an extended temperature range from -40 °C to +105 °C and accepts TTL, CMOS, PMOS, and DTL compatible logic inputs.

Feature Summary

• Seven integrated Darlington pairs with common emitter configuration
• Integrated suppression diodes for driving inductive loads
• Inputs pinned opposite outputs to simplify printed circuit board layout
• Compatibility with standard logic families including TTL, CMOS, PMOS, and DTL

Applications

• Driving solenoids and relays
• Controlling DC motors
• Powering LED displays and filament lamps
• Operating thermal print-heads
• High-power buffering applications

Procurement Notes

Verify the specific manufacturer source when ordering, as the ULQ2004A part number is utilized by multiple semiconductor vendors including STMicroelectronics, Texas Instruments, and Allegro MicroSystems. Confirm that the datasheet specifications match the intended design requirements, particularly regarding thermal resistance and package type. Ensure the selected variant corresponds to the required operating temperature range and logic compatibility before finalizing procurement.

Selection Notes

Select this component for applications requiring multiple high-current switching channels controlled by low-power logic signals. The internal suppression diodes eliminate the need for external flyback diodes when driving inductive loads such as relays or solenoids. Consider the 500 mA per-channel rating and the ability to parallel outputs for higher current demands. Verify that the input voltage levels align with the system's logic family to ensure reliable switching without additional level-shifting circuitry.

Part Context

The ULQ2004A belongs to the ULQ200x series of high-voltage Darlington arrays produced by STMicroelectronics. This series also includes variants such as the ULQ2001, ULQ2003, and their automotive-qualified counterparts like the ULQ2003D1. These devices share a similar functional architecture but may differ in qualification standards, packaging options, or specific electrical characteristics tailored for industrial or automotive environments.

Replacement Considerations

Direct pin-compatible substitutes include the ULQ2003A and ULQ2001A from STMicroelectronics. Other manufacturers offer equivalent parts under the same ULQ2004A designation, such as those from Texas Instruments or Allegro MicroSystems. Verify that any replacement maintains the 500 mA output current capability and integrated suppression diode functionality.