Comparison page

PCA9685 vs ULN2003

Side-by-side selection notes for specs, ecosystem readiness, known issues, and data confidence. This page is generated from structured component fields instead of a hand-written article.

PCA9685

Projects needing PWM and Servo with a commonly available power part.

ULN2003

Projects needing Driver array and Stepper kit with a commonly available power part.

Specification Matrix

DimensionPCA9685 ULN2003

CategoryPowerPower

MakerNXPTexas Instruments

CoreNot specifiedNot specified

ClockNot specifiedNot specified

WirelessNot specifiedNot specified

Voltage3.3V3.3V

LibrariesArduino, MicroPythonArduino

Price$1.50 - $5.00$0.10 - $0.60

Known Tradeoffs

PCA9685

Breakout boards may use different pin labels or regulator choices
Clone modules can differ from the original datasheet part

ULN2003

Breakout boards may use different pin labels or regulator choices
Clone modules can differ from the original datasheet part

Open Individual Model Pages

PCA9685

NXP

16-channel PWM controller used for servo control, LED dimming, and robotics projects.

China-madePower88% confidence

ULN2003

Texas Instruments

Darlington transistor array often sold with 28BYJ-48 stepper motor kits.

China-madePower82% confidence