Comparison page

ETA3406 vs PCF8574

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.

ETA3406

Projects needing Buck and Low cost with a commonly available power part.

PCF8574

Projects needing IO expansion and I2C with a commonly available power part.

Specification Matrix

DimensionETA3406 PCF8574

CategoryPowerPower

MakerETA SolutionsNXP

CoreNot specifiedNot specified

ClockNot specifiedNot specified

WirelessNot specifiedNot specified

Voltage3.3V3.3V

LibrariesNeeds verificationArduino, MicroPython

Price$0.10 - $0.60$0.20 - $1.00

Known Tradeoffs

ETA3406

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

PCF8574

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

Open Individual Model Pages

ETA3406

ETA Solutions

Low-cost buck converter used in Chinese modules and compact power rails.

China-madePower64% confidence

PCF8574

NXP

I2C GPIO expander often used in LCD backpacks and small IO expansion modules.

China-madePower84% confidence