Comparison page

MCP23017 vs TP4056

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.

MCP23017

Projects needing IO expansion and 16 pins with a commonly available power part.

TP4056

Projects needing Li-ion charger and Cheap module with a commonly available power part.

Specification Matrix

DimensionMCP23017 TP4056

CategoryPowerPower

MakerMicrochipNanJing Top Power

CoreNot specifiedNot specified

ClockNot specifiedNot specified

WirelessNot specifiedNot specified

Voltage3.3V3.3V

LibrariesArduino, MicroPythonNeeds verification

Price$1.00 - $3.50$0.10 - $0.50

Known Tradeoffs

MCP23017

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

TP4056

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

Open Individual Model Pages

MCP23017

Microchip

16-bit I2C GPIO expander used when a microcontroller needs many extra digital pins.

China-madePower86% confidence

TP4056

NanJing Top Power

Very common single-cell lithium battery linear charger used in low-cost charging modules.

China-madePower78% confidence