Comparison page

AMS1117-3.3 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.

AMS1117-3.3

Projects needing LDO and Common with a commonly available power part.

PCF8574

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

Specification Matrix

DimensionAMS1117-3.3 PCF8574

CategoryPowerPower

MakerAdvanced Monolithic SystemsNXP

CoreNot specifiedNot specified

ClockNot specifiedNot specified

WirelessNot specifiedNot specified

Voltage3.3V3.3V

LibrariesNeeds verificationArduino, MicroPython

Price$0.05 - $0.30$0.20 - $1.00

Known Tradeoffs

AMS1117-3.3

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

AMS1117-3.3

Advanced Monolithic Systems

Legacy linear regulator used on many Arduino and ESP breakout boards.

China-madePower76% confidence

PCF8574

NXP

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

China-madePower84% confidence