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Adafruit 4-channel I2C-safe Bi-directional Logic Level Converter

by Adafruit
An image of Adafruit 4-channel I2C-safe Bi-directional Logic Level Converter An image of Adafruit 4-channel I2C-safe Bi-directional Logic Level Converter An image of Adafruit 4-channel I2C-safe Bi-directional Logic Level Converter An image of Adafruit 4-channel I2C-safe Bi-directional Logic Level Converter

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.

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 BSS138 FETs with 10K pullups. 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 Adafruit designed it for use with I2C, this works as well for  TTL Serial,  slow <2MHz SPI, and any other digital interface both uni-directional 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.

TECHNICAL DETAILS

  • BSS138 Datasheet
  • EagleCAD PCB files on GitHub
  • Fritzing library

The newer NXP app note explaining how it works (the older Philips version of the app note is also worth a read)

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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.

ADA757

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SKU
ADA757
EAN
0700443113786
Brand
Adafruit
Stock available
0 units
Backorder not allowed on this product
Weight
3g

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