ULQ2003A

Overview

The ULQ2003A is a high-voltage, high-current Darlington transistor array manufactured by STMicroelectronics. It integrates seven NPN Darlington pairs with common emitters and open-collector outputs. Each channel supports a continuous collector current of 500 mA and withstands peak currents up to 600 mA. The device features an output voltage rating of 50 V and includes integrated suppression diodes for inductive load driving. Inputs are pinned opposite outputs to simplify board layout. The component operates within a temperature range of -40 °C to +105 °C and interfaces directly with TTL, CMOS, PMOS, and DTL logic families.

Feature Summary

• Integrates seven high-voltage NPN Darlington pairs with common emitters
• Includes internal suppression diodes for efficient inductive load switching
• Features input-output pin opposition to facilitate printed circuit board layout
• Compatible with standard logic families including TTL, CMOS, PMOS, and DTL

Applications

• Relay drivers
• Solenoid actuators
• LED and gas discharge display drivers
• Line drivers and logic buffers
• Thermal print-head drivers

Procurement Notes

Verify the specific package variant during procurement, as the ULQ2003A is available in both 16-pin plastic DIP and SO-16 surface-mount configurations. Confirm that the selected part meets the required thermal resistance specifications, particularly if utilizing the copper lead-frame DIP version for higher power dissipation. Ensure the supplier provides documentation confirming compliance with RoHS standards and REACH SVHC requirements for the specific manufacturing batch.

Selection Notes

Select the ULQ2003A when driving loads requiring up to 500 mA per channel from low-current logic sources. The 2.7 kΩ series base resistors allow direct interfacing with 5V CMOS and TTL circuits without external current-limiting components. Consider the SO-16 package if automotive qualification under AEC-Q100 is required, noting that this grade supports an extended operating temperature range up to 125 °C compared to the commercial 105 °C limit.

Part Context

The ULQ2003A belongs to the ULx200xA family of high-voltage Darlington arrays produced by STMicroelectronics. This family includes variants such as the ULN2001A, ULQ2001, and ULQ2004, which differ primarily in their internal base resistor values to optimize compatibility with specific logic voltage levels. The ULQ2003A specifically targets applications requiring direct interface with 5V logic systems while providing robust switching capabilities for moderate-power loads.

Replacement Considerations

The ULQ2003D1 serves as the surface-mount equivalent of the ULQ2003A. Other compatible devices within the same functional family include the ULQ2001 and ULQ2004, though these feature different base resistances suitable for distinct logic voltage ranges.