XD2002 Seven Darlington arrays

Product Overview

The XINLUDA XD2002 is a high-voltage, high-current Darlington transistor array designed to interface TTL/CMOS logic levels with inductive or high-power loads. It is functionally equivalent to the ULN2002AN, which is widely adopted in relay drivers, LED arrays, and stepper motor control systems.

Advantage: The XD2002 provides full pin-to-pin functional compatibility with the ULN2002AN, ensuring seamless integration into existing designs.

Output Drive Capability

Both the XD2002 and ULN2002AN feature:

• Seven NPN Darlington pairs

• Output current capacity up to 500 mA per channel

• Output voltage withstand up to 50V

The XD2002 maintains excellent current sinking capability and thermal performance under full load conditions.

Advantage: XINLUDA ensures low saturation voltage across a wide load range, reducing power dissipation and improving efficiency in high-channel count applications.

Input Logic Compatibility

The XD2002 is optimized for 5V TTL and CMOS logic levels, similar to the ULN2002AN. This includes built-in input resistors suited for standard TTL outputs without requiring external drive components.

Advantage: The XD2002 supports direct microcontroller/FPGA interfacing with strong noise immunity, streamlining PCB design and reducing the need for level-shifting circuits.

Freewheeling Diodes for Inductive Loads

Like the ULN2002AN, the XD2002 integrates internal flyback (clamp) diodes to suppress voltage spikes from inductive loads such as relays, solenoids, and motors. These diodes are connected to a common COM pin for easy external connection to the supply rail.

Advantage: Built-in protection for connected inductive loads improves system robustness and simplifies external circuitry design.

Packaging and Footprint Compatibility

The XD2002 is available in the standard DIP-16 and SOP-16 packages, fully matching the form factor and pin layout of the ULN2002AN.

Advantage: Drop-in replacement capability allows design engineers to substitute the XD2002 in existing hardware without PCB changes, offering enhanced sourcing flexibility.

Performance and Reliability

XINLUDA's XD2002 undergoes rigorous quality assurance testing to ensure consistent parameters, including:

• Low saturation voltage for energy efficiency

• Wide temperature range operation: –40°C to +85°C

• High ESD and surge robustness

Advantage: High consistency in electrical characteristics across batches supports predictable performance in industrial and automotive-grade applications.

Supply Chain and Cost Efficiency

Compared to legacy ULN2002AN products, which may face supply volatility or pricing increases, the XD2002 from XINLUDA offers stable lead times and cost-effective procurement, making it an ideal choice for high-volume production environments.

Advantage: Lower BOM cost and reliable availability reduce production delays and improve supply chain resilience.

Conclusion

The XINLUDA XD2002 offers a reliable and high-performance alternative to the ULN2002AN, with key benefits including:

• Full functional and pin compatibility

• Integrated input resistors and clamp diodes

• Lower saturation voltage and improved efficiency

• Drop-in replacement with DIP-16/SOP-16 footprint

• Enhanced reliability and stable sourcing

The XD2002 is ideally suited for modern relay driving, LED matrix control, and other medium-to-high current switching applications where performance, availability, and cost efficiency are critical.