ULN2004ANE4

Overview

The ULN2004ANE4 is a high-voltage, high-current NPN Darlington transistor array manufactured by Texas Instruments. It integrates seven open-collector Darlington pairs within a single 16-pin DIP package. Each channel supports a continuous collector current of 500 mA and withstands peak currents up to 600 mA, with a maximum output voltage rating of 50 V. The device includes integrated suppression diodes connected to a common cathode for handling inductive loads. A 10.5 kΩ series base resistor per input allows direct interfacing with CMOS logic operating between 6 V and 15 V.

Feature Summary

• Integrates seven independent NPN Darlington pairs with common emitters
• Includes internal clamping diodes for switching inductive loads
• Features 10.5 kΩ base resistors for direct CMOS compatibility
• Input pins are positioned opposite outputs to simplify PCB layout

Applications

• Relay driver circuits
• Stepper and DC brushed motor drivers
• LED and gas discharge display drivers
• High-power logic buffers and line drivers

Procurement Notes

Verify the E4 suffix indicates lead-free compliance during sourcing. Confirm the specific package variant matches design requirements. Check manufacturer discontinuation notices as availability may vary across distributors. Ensure thermal management aligns with power dissipation limits under load conditions.

Selection Notes

Select this component when driving moderate current loads directly from 6 V to 15 V CMOS sources. The integrated base resistors eliminate external components required for other variants. Consider parallel outputs if higher current capacity than 500 mA is needed. Verify that the 50 V voltage rating exceeds the maximum load supply voltage.

Part Context

This part belongs to the ULx200xA family of Darlington arrays. Unlike the ULN2003A which targets 5 V TTL/CMOS, the ULN2004A variant features higher resistance inputs suitable for 6 V to 15 V operation. The ULN2002A is designed specifically for PMOS interfaces. This family provides a versatile solution for various logic families including DTL and PMOS.

Replacement Considerations

The ULN2004AN serves as a standard equivalent without the E4 environmental suffix. Other manufacturers produce pin-compatible alternatives such as the STMicroelectronics ULN2004A. Verify that substitute parts maintain the same 10.5 kΩ base resistance value for identical drive characteristics.