Comparison page

CH340G vs JDY-31

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.

CH340G

Projects needing USB UART and Low cost with a commonly available communication part.

JDY-31

Projects needing Bluetooth and UART with a commonly available communication part.

Specification Matrix

DimensionCH340G JDY-31

CategoryCommunicationCommunication

MakerWCHJDY

CoreNot specifiedNot specified

ClockNot specifiedNot specified

WirelessNot specifiedNot specified

Voltage3.3V3.3V

LibrariesNeeds verificationArduino

Price$0.20 - $0.60$1.00 - $3.00

Known Tradeoffs

CH340G

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

JDY-31

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

Open Individual Model Pages

CH340G

WCH

USB-to-UART bridge chip used on many low-cost Arduino-compatible and ESP development boards.

China-madeCommunication86% confidence

JDY-31

JDY

Low-cost Bluetooth serial module sold in Chinese marketplaces as an HC-05-class alternative.

China-madeCommunication66% confidence