8-channel Bi-directional Logic Level Converter (TXB0108)

AdafruitSKU: ADA395
(4 Reviews)
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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.

Although one can use resistors to make a divider, for high speed transfers, the resistors can add a lot of slew and cause havoc that is tough to debug. For that reason, we like using 4050/74LVX245 series and similar logic to perform proper level shifting. Only problem is that they are only good in one direction which can be a problem for some specialty bi-diectional interfaces and also makes wiring a little hairy.

That's where this lovely chip, the TXB0108 bi-directional level converter comes in! This chip perform bidirectional level shifting from pretty much any voltage to any voltage and will auto-detect the direction. Only thing that doesn't work well with this chip is i2c (because it uses strong pullups which confuse auto-direction sensor). If you need to use pullups, you can but they should be at least 50K ohm - the ones internal to AVRs/Arduino are about 100K ohm so those are OK! Its a little more luxurious than a 74LVX245 but if you just don't want to worry about directional pins this is a life saver!

Since this chip is a special bi-directional level shifter it does not have strong output pins that can drive LEDs or long cables, it's meant to sit on a breadboard between two logic chips! If you do not need instant bi-directional support, we suggest the 74LVX245 as below which has strong output drive.

This breakout saves you from having to solder the very fine pitch packages that this chip comes with. We also add 0.1uF caps onto both sides and a 10K pull-up resistor on the output enable pin so you can use it right out of the box!

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Verified Customer
Sally M
Shepherds Bush, United Kingdom
8-channel Bi-directional Logic Level Converter (TXB0108)
cannot comment as yet as this was requested as a Xmas present.
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3 years ago
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Kevin L
Leeds, United Kingdom
8-channel Bi-directional Logic Level Converter (TXB0108)
This is exactly what I needed to build an EEprom Programmer using a Raspberry Pi3, it works very well as a translation of voltages between the Pi and the EEprom's Data Bus
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3 years ago
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Martin S
8-channel Bi-directional Logic Level Converter (TXB0108)
Incredible.
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4 years ago
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Shiela D
New York, United States
8-channel Bi-directional Logic Level Converter (TXB0108)
It's very easy to use and versatile. Being a small board means that you can add headers to make it into a DIP, or use as-is to fit in a smaller space. It has labels right there on the board, making it easy to connect, and some support components fitted. However, it's much pricier than a 74LVC245 which I now know pretty much does the same job with a smaller footprint.
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4 years ago

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