4-channel I2C-safe Bi-directional Logic Level Converter – 2N7002

by componentcart
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4-channel I2C

Because the Arduino (and Basic Stamp) are 5V devices, and most modern sensors, displays, flash cards and modes are 3.3V-only, many makers find that they need to perform level shifting/conversion to protect the 3.3V device from 5V. 

There are some other handy level shifters available in the market, from the DIP 74LVC245 to the fancy bi-directional TXB0108. However, neither of these are happy to work with I2C, which uses a funky pull-up system to transfer data back and forth. This level shifter board combines the ease-of-use of the bi-directional TXB0108 with an I2C-compatible FET design following NXP’s app note. 

This breakout has 4 2N7002FETs with 10K pull ups. It works down to 1.8V on the low side, and up to 10V on the high side. The 10K’s do make the interface a little more sluggish than using a TXB0108 or 74LVC245 so we suggest checking those out if you need high-speed transfer. 

While we designed it for use with I2C, this works as well for TTL Serial, slow <2MHz SPI, and any other digital interface both unidirectional and bidirectional. Comes with a fully assembled, and tested PCB with 4 full bidirectional converter lines as well as 2 pieces of 6-pin header you can solder on to plug into a breadboard or perfboard. 

Features & Specification:

  • Number of Channels              4 
  • Voltage on Lx Side                  1.8V-5V 
  • Voltage on Hx Side                 2.8V-6V 
  • Power                                      2.8V – 6V 
  • Length (mm)                           16 
  • Width (mm)                            13 
  • Height (mm)                            3 
  • Weight (gm)                            2 



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