Texas Instruments

ULN2003APW

ULN2003APW Description

The ULN2003APW from Texas Instruments is a high-voltage, high-current Darlington transistor array designed for low-side switching applications. Housed in a 16-pin TSSOP package, it integrates seven NPN Darlington pairs capable of driving loads up to 50V and 500mA per channel. This device operates without an external supply voltage (Vcc/Vdd), simplifying its integration into circuits. Its inverting input logic ensures compatibility with TTL and CMOS logic levels, making it ideal for interfacing microcontrollers or logic circuits with inductive loads like relays and solenoids.

ULN2003APW Features

• 7-Channel Darlington Array: Provides independent low-side drivers for multi-load control.
• High-Voltage Tolerance: Supports load voltages up to 50V, suitable for industrial and automotive applications.
• 500mA Sink Current per Channel: Robust enough to drive relays, solenoids, and small DC motors.
• Integrated Suppression Diodes: Built-in clamp diodes for inductive load protection, reducing external component count.
• Wide Logic Compatibility: Inverting inputs work with 5V TTL/CMOS, simplifying microcontroller interfacing.
• Surface-Mount (TSSOP) Package: Compact footprint for space-constrained PCB designs.
• RoHS3 & REACH Compliant: Meets environmental and safety standards for global use.

ULN2003APW Applications

• Relay/Solenoid Drivers: Ideal for switching inductive loads in automation systems.
• Stepper Motor Control: Used in conjunction with microcontrollers for precise motion control.
• LED Display Drivers: Drives high-current LED matrices or segments.
• Industrial PLCs: Provides reliable load switching in harsh environments.
• Automotive Systems: Controls actuators, lamps, or other low-side loads in vehicles.

Conclusion of ULN2003APW

The ULN2003APW excels in low-side switching with its high current capability, integrated protection, and compact form factor. Its Darlington configuration ensures high gain and reliability, while the lack of a required Vcc simplifies design. Though marked as Last Time Buy, it remains a cost-effective solution for legacy or new designs needing robust load driving. Engineers favor it for industrial control, automotive, and embedded systems where durability and ease of use are critical.