ULQ2802A

Overview

The ULQ2802A is an eight-channel NPN Darlington transistor array manufactured by STMicroelectronics. It integrates eight common-emitter Darlington pairs with internal suppression diodes for inductive load control. The device supports a continuous collector current of 500 mA and withstands up to 50 V in the off state. Designed for robust operation, it functions within a temperature range of -40 °C to +105 °C. The component utilizes an 18-lead plastic DIP package with through-hole mounting. Input pins are positioned opposite their corresponding outputs to facilitate printed circuit board layout.

Feature Summary

• Integrates eight high-voltage Darlington transistors with common emitters
• Includes integral suppression diodes for protecting against inductive kickback
• Features input-opposite-output pin configuration to simplify board design
• Optimized for interfacing with PMOS logic families via specific input resistance

Applications

• Driving inductive loads such as relays and solenoids
• Interfacing with 14-25 V PMOS logic families
• General-purpose switching applications requiring high current gain

Procurement Notes

Verify the manufacturer part number ULQ2802A against official STMicroelectronics documentation to ensure authenticity. Confirm that the package type matches the required 18-lead plastic DIP specification. Check for compliance with relevant environmental standards if applicable to the final assembly. Ensure the operating temperature range meets the system requirements.

Selection Notes

Select this component when interfacing with 14-25 V PMOS logic due to its specific 10.5 kΩ input resistor and Zener protection. Choose the ULQ2802A over other variants like ULN2803A or ULQ2804A only if the voltage and logic family requirements align precisely with its design specifications. Consider the 500 mA continuous current rating for load capacity planning.

Part Context

The ULQ2802A belongs to the ULQ/ULN series of Darlington arrays from STMicroelectronics. This family includes variants tailored for different logic families, such as TTL, CMOS, and PMOS. The ULQ2802A specifically targets higher voltage PMOS interfaces, distinguishing it from the ULN2803A which serves 5 V logic. All members share the same 18-pin DIP footprint and core Darlington structure.

Replacement Considerations

The ULN2802A is a closely related variant within the same product family. Verify if the specific PMOS interface features of the ULQ2802A are strictly necessary or if the ULN2802A suffices for the application.