TRANS 8NPN DARL 50V 0.5A 18SOIC

ULN2803ADW – 8-Channel 50V Darlington Transistor Array – Texas Instruments

This ULN2803ADW from Texas Instruments is a high-voltage, high-current Darlington transistor array ideal for driving demanding inductive or resistive loads. As an obsolete component still vital for legacy designs, PCX provides reliable access to this industrial-grade driver with guaranteed authentic stock and expedited shipping options.

Key Features

• 8 Independent Channels for multi-load control
• 50V Collector-Emitter Voltage rating per channel
• 500mA Continuous Current output capability
• Integrated Clamp Diodes for inductive load protection
• Surface-Mount 18-SOIC Package (7.50mm width)
• Wide Temperature Range: -40°C to +85°C

Technical Details

This Darlington array integrates eight NPN Darlington pairs with common emitters, featuring high DC current gain and TTL/CMOS compatible inputs. The ULN2803ADW includes built-in suppression diodes for switching inductive loads. Housed in an industry-standard 18-SOIC surface-mount package, it operates across industrial temperature ranges (-40°C to +85°C) with a base product number ULN2803.

Typical Applications

• Relay and solenoid drivers
• Stepper motor controllers
• LED display/Lamp drivers
• Logic buffering interfaces
• Industrial automation systems

About Texas Instruments

Texas Instruments (TI) is a global semiconductor leader with over 90 years of innovation in analog and embedded processing technologies. Renowned for quality and reliability, TI’s components are engineered to meet stringent industrial standards, serving sectors from automotive to industrial automation.

TI maintains rigorous manufacturing controls and extensive product validation processes. Their Darlington transistor arrays like the ULN2803 series are industry benchmarks for robustness, with decades of proven performance in mission-critical systems worldwide.

About Darlington Transistor Arrays

Darlington transistor arrays integrate multiple high-gain transistor pairs into a single IC, enabling low-power control circuits to drive high-current loads. Their cascaded design delivers exceptional current amplification – typically 1000x or higher – while minimizing board space.

These arrays simplify designs requiring multiple driver channels, such as motor controllers or multi-relay interfaces. Integrated clamp diodes protect against voltage spikes from inductive loads, while standardized packages ensure drop-in compatibility. This makes them essential for industrial controls, automotive systems, and power management applications.

Packaging

Available in protective Tube packaging. Contact PCX for bulk or specialized handling requirements.

FAQs

Q: Is this part obsolete? Can I still use it in new designs?
A: While marked obsolete by Texas Instruments, the ULN2803ADW remains available through PCX for legacy system maintenance and repairs. For new designs, consult our team for recommended alternatives.

Q: What is the maximum switching frequency?
A: Typical switching frequencies reach 1-2kHz depending on load characteristics. Refer to the datasheet for detailed performance curves.

Q: Do I need external flyback diodes?
A: No – integrated suppression diodes handle inductive kickback from coils and relays up to 50V.

Q: Can this drive DC motors directly?
A: Yes, for motors under 500mA/channel. For higher currents, use channels in parallel or add external transistors.

Q: Is the 18-SOIC package RoHS compliant?
A: Yes, this device meets RoHS 3 standards.

Q: What’s the difference between ULN2803A and earlier versions?
A: The “A” revision features improved input resistor values for better noise immunity and lower power consumption.

Note: Product image is representational. Refer to datasheet for exact dimensions.

Reliable Obsolete Component Support

PCX specializes in sourcing legacy semiconductors with full traceability. Our engineering team verifies all obsolete components to ensure performance matches original specifications.

Order ULN2803ADW today for same-day shipping! Contact PCX for volume pricing and lifecycle solutions.