ULN2003D1

Overview

The ULN2003D1 is a high-voltage, high-current Darlington array manufactured by STMicroelectronics in an SO-16 (Narrow) surface-mount package. It contains seven open-collector Darlington pairs with common emitters. 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 driving inductive loads. Designed for TTL and CMOS logic families, it operates within an ambient temperature range of -20 °C to +85 °C.

Feature Summary

• Seven open-collector Darlington pairs per package
• Integrated suppression diodes for inductive load protection
• Inputs pinned opposite outputs to simplify board layout
• Compatible with TTL, CMOS, PMOS, and DTL logic families

Applications

• Driving solenoids and relays
• Controlling DC motors
• Powering LED displays and filament lamps
• Operating thermal printheads
• High-power buffer circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the package type and reel specifications. Ensure that the component meets the required environmental standards and lead-free compliance before finalizing procurement orders.

Selection Notes

Select this component when interfacing low-voltage digital logic with higher voltage or current loads. The ULN2003D1 is specifically optimized for 5V TTL and CMOS inputs. Consider the SO-16 package dimensions and thermal resistance characteristics during the PCB layout phase to ensure adequate heat dissipation.

Part Context

This part belongs to the ULN200XA/XD1 family of high-voltage Darlington arrays. The 'D1' suffix indicates the SO-16 narrow small-outline package variant, distinct from the DIP-16 plastic package used by the 'A' series. This family provides versatile solutions for general-purpose switching applications requiring multiple independent channels.

Replacement Considerations

Direct functional substitutes include the ULN2001D1, ULN2002D1, and ULN2004D1. These variants share the same physical package and pinout but differ in input threshold voltages and logic compatibility. Verify the specific logic interface requirements before substituting.