ULN2803CDWR

Power Distribution Switches, Load Drivers Overview

The ULN2803CDWR is an eight-channel NPN Darlington transistor array manufactured by Texas Instruments in a 20-pin SOIC package. It features a maximum collector-emitter voltage of 50 V and a continuous collector current rating of 500 mA per channel. The device includes integrated common-cathode clamp diodes for switching inductive loads. Each Darlington pair incorporates a 2.7 kΩ series base resistor, enabling direct interface with TTL or 5V CMOS logic without external components.

Power Distribution Switches, Load Drivers Feature Summary

• Integrates eight independent NPN Darlington pairs for high-current switching applications
• Includes built-in common-cathode clamp diodes to suppress transient voltages from inductive loads
• Features internal 2.7 kΩ base resistors for direct compatibility with standard digital logic families

Power Distribution Switches, Load Drivers Applications

• Relay drivers
• Stepper motor drivers
• LED and gas discharge lamp drivers
• Line drivers and logic buffers

Power Distribution Switches, Load Drivers Procurement Notes

Verify the specific suffix 'CDWR' corresponds to the SOIC-20 surface-mount package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure thermal management strategies align with the specified operating temperature range and power dissipation limits defined in the datasheet.

Power Distribution Switches, Load Drivers Selection Notes

Select this component when multiple high-current outputs are required from a low-power logic source. The integrated base resistors simplify circuit design by eliminating external current-limiting components. Consider the SOIC-20 package constraints for PCB layout and verify that the 50V output voltage rating exceeds the maximum load supply voltage.

Power Distribution Switches, Load Drivers Part Context

This part belongs to the ULN2803C family of high-voltage Darlington arrays. It serves as a bridge between low-power digital control circuits and high-power analog loads. The CDWR designation specifically identifies the tape-and-reel version of the SOIC-20 package, distinguishing it from through-hole DIP variants like the ULN2803A.

Power Distribution Switches, Load Drivers Replacement Considerations

Compatible substitutes include ULN2803APW and ULN2803AN. Verify pinout compatibility and electrical ratings before substitution. Ensure the alternative package type matches the existing PCB footprint or allows for appropriate adapter usage.