XD2004 7 CHANNELS DARLINGTON SINK DRIVER

Product Overview

The XINLUDA XD2004 is a high-voltage, high-current Darlington transistor array featuring seven NPN Darlington pairs with integrated clamp diodes for driving inductive loads. It is fully compatible with the ULN2004AN, which is widely used in industrial control, relay drivers, and LED applications.

Advantage: XD2004 offers full functional and pin-to-pin compatibility with the ULN2004AN, ensuring seamless substitution in existing designs.

Logic-Level Input Compatibility

Unlike ULN2003A (which is tailored for TTL logic), the ULN2004AN and XD2004 are specifically designed for use with high-voltage logic levels, such as CMOS or 12V logic systems. Both feature built-in series base resistors to accommodate these input levels safely.

Advantage: XD2004 reliably supports high-voltage logic inputs (up to 12V), enabling direct control from CMOS logic or discrete 12V systems without the need for additional resistors or logic converters.

Output Drive Capability

Both the XD2004 and ULN2004AN support:

• Seven independent Darlington outputs

• Output voltage up to 50V

• Sink current capability of 500 mA per channel (with higher peak currents possible)

Advantage: XINLUDA’s XD2004 features optimized drive transistors with lower typical output saturation voltage, reducing power dissipation and improving load-driving efficiency.

Integrated Flyback Diodes

For inductive load protection, both devices integrate internal clamp diodes to absorb back EMF. These diodes are connected to a common COM pin that can be tied to the supply voltage.

Advantage: The integrated flyback diodes in XD2004 are robust and efficient, offering reliable protection in applications involving relays, solenoids, or stepper motors.

Packaging and Mechanical Compatibility

The XD2004 is available in DIP-16 and SOP-16 packages, matching the industry-standard footprint and pinout of ULN2004AN from Texas Instruments, STMicroelectronics, ON Semiconductor, and others.

Advantage: XINLUDA ensures mechanical interchangeability with leading brands, allowing plug-and-play replacement in existing board layouts without redesign or requalification.

Thermal and Electrical Performance

The XD2004 maintains stable operation over a wide temperature range (typically –40°C to +85°C), with consistent electrical parameters across production batches.

Advantage: Enhanced thermal performance and low parametric variation improve reliability in high-duty-cycle applications or thermally challenging environments.

Supply Chain and Cost Efficiency

While global brands’ supply availability for ULN2004AN may fluctuate due to high demand and extended lead times, XINLUDA offers stable production capacity and competitive pricing for the XD2004.

Advantage: XINLUDA provides a cost-effective, reliable sourcing option with consistent lead times, making it ideal for volume production and long-term supply planning.

Conclusion

The XINLUDA XD2004 is a fully compatible and reliable alternative to the ULN2004AN, with the following key benefits:

• Optimized for high-voltage CMOS input logic

• Integrated input resistors for 12V compatibility

• Robust clamp diodes for inductive load protection

• Low saturation voltage and strong thermal stability

• DIP/SOP form factor matching industry standards

• Competitive cost and dependable availability

These advantages make the XD2004 ideal for use in industrial automation, consumer appliances, automotive subsystems, and any application requiring rugged and efficient high-side switching.