eBay

1PCS 8 Channel 5V/3.3V IIC UART SPI TTL Logic Level Converter Bi-Directional Module

Conversion level range: 1.8V-6V

Module size: 28mm X 27.5mm

Instructions:( for example 3.3V, 5V system conversion)

VCCA connect to 3.3V power supply
VCCB connected to 5V power supply
GND negative one, two power supply common ground
Ax input 3.3V TTL level,Bx will output 5V TTL level
Ax input 5V TTL level,Bx will output 3.3V TTL level

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