The ULN2803ADWR provides a high output current drive with a very low input current, which equates to a low general-purpose input/output (GPIO) voltage. The GPIO voltage is converted to base current through the 2.7 kΩ resistor connected between the pre-driver Darlington NPN’s input and base. The 7.2 kΩ and 3 kΩ resistors connected between the base and the emitter of each NPN suppress the leakage that may occur from the input.

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By considering thermal and electrical properties, designers can design PCB layouts and incorporate thermal management strategies that maximize the efficiency, reliability, and lifespan of the electronic systems they develop.

In addition to the characteristics above, the ULN2803ADWR datasheet provides more information for your PCB layout design. As shown in the schematic, footprint, and 3D model below, your component’s CAD model and data must be accurate and from a trusted database to be helpful.

In typical operation, the diodes on the base and the collector pins to the emitter are reversed-biased. If these diodes are forward-biased, internal parasitic NPN transistors draw a nearly equal current from other pins.

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The thermal and electrical characteristics of Darlington transistors are also important to know because they enable PCB designers to select and integrate transistors into their designs while ensuring optimal performance and reliability. The datasheet shows these characteristics of the ULN2803ADWR.

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The ULN2803ADWR has eight negative-positive-negative (NPN) Darlington pairs featuring high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The Darlington pairs can be connected in parallel for higher current capability, and each pair has a collector-current rating of 500 mA.

The ULN2803ADWR is a smart choice for solenoids, relays, lamps, small motors, and display drivers (light-emitting diode and gas discharge). Paralleling outputs can serve applications that require sink currents beyond the capability of a single output.

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The ULN2803ADWR, made by Texas Instruments, is a high-voltage, high-current Darlington transistor array. Invented by Sidney Darlington in 1953, a Darling transistor configuration has bipolar transistor pairs with the emitter of one transistor connected to the base of the other so that the current amplified by the first transistor is amplified more by the second one. The article below examines the characteristics of the array detailed in the ULN2803ADWR datasheet.

A Darlington transistor’s maximum ratings are essential for PCB designers to know because they define the operational limits within which the transistor can function without risking damage or failure. Below are the absolute maximum ratings for the ULN2803ADWR as presented in the datasheet: