Comparison page

PCF8574 vs SY8089

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.

PCF8574

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

SY8089

Projects needing Buck and Small with a commonly available power part.

Specification Matrix

DimensionPCF8574 SY8089

CategoryPowerPower

MakerNXPSilergy

CoreNot specifiedNot specified

ClockNot specifiedNot specified

WirelessNot specifiedNot specified

Voltage3.3V3.3V

LibrariesArduino, MicroPythonNeeds verification

Price$0.20 - $1.00$0.10 - $0.50

Known Tradeoffs

PCF8574

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

SY8089

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

Open Individual Model Pages

PCF8574

NXP

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

China-madePower84% confidence

SY8089

Silergy

Small synchronous buck regulator seen on compact embedded boards.

China-madePower70% confidence