ULN2004AN Pinout, Circuit, Uses

ULN2004AN Pinout Equivalent

ULN2004AN Picture

1：Overview of the ULN2004AN.

The ULN2004AN is a high-voltage, high-current Darlington transistor array integrated circuit widely used in electronic circuits. The working principle of Darlington transistors is based on the current amplification characteristics of bipolar junction transistors. When a small control current is applied to the input pins of the ULN2004AN, the two-stage amplification through the Darlington transistors results in a larger current output at the output pins. This allows it to drive loads that require substantial current to function properly.

Relay drive: Relays typically require a significant current to energize their coils, and the high current output capability of the ULN2004AN perfectly meets this requirement. By connecting the microcontroller’s output signal to the input pins of the ULN2004AN, it becomes convenient to control the relay’s on and off states.

Stepper motor drive: Stepper motors require precise current control to achieve accurate step movements. The ULN2004AN can provide sufficient drive current for stepper motors and allows for forward and reverse rotation as well as step count control by managing the sequence of input signals.

Electromagnetic valve drive: Electromagnetic valves are widely used in industrial control and automation equipment, requiring significant current when operating. The ULN2004AN can serve as a driver circuit for electromagnetic valves, effectively controlling their operation.

2：LNK364PN Important pin function definition:

ULN2004AN uses a 16-pin dual in-line package (DIP-16), with the pin functions as follows:

3：Alternative model recommendation

XD2004：XD2004 is a high-voltage, high-current Darlington transistor array produced by XINLUDA. It features 7 channels and comes in a DIP-16 package, offering pin-to-pin compatibility with the ULN2004AN. The operating temperature range is -40°C to 85°C, which is wider than the ULN2004AN’s range of -20°C to 70°C. Additionally, it offers lower costs and better availability.

XD2004 Picture

ULN2803：The ULN2803 is manufactured by Toshiba Corporation and consists of eight NPN Darlington tubes in DIP-18, SOP-18 and other packages. It is also a high voltage, high current Darlington transistor array, operating temperature range of -40 ℃~85℃, suitable for computers, industrial equipment and consumer products lighting, relay control, printers and other application scenarios, in some of the channel number requirements are not strict can replace ULN2004AN.

ULN2803 Picture

MC1413：MC1413 is a product from Motorola (now NXP), also a Darlington transistor array. It features 7 Darlington pairs, capable of withstanding 50V and delivering an output current of 500mA. Compared to XD2004, its functionality is largely similar, though there may be slight differences in some electrical parameters. It comes in various package options, allowing selection based on specific needs.

MC1413 Picture

UDN2981：UDN2981 is a high-voltage, high-current Darlington transistor array product from ON Semiconductor. It features 8 channels with a voltage rating of 50V and each channel can handle up to 500mA of current. Compared to XD2004, it offers more channels, making it suitable for applications requiring more drive channels. The pin configuration and functionality differ from those of XD2004, so corresponding adjustments must be made to the circuit when substituting.

UDN2981 Picture