KitsGuru 8 Channel Logic Level Bi-directional Converter Module TXS0108E TXB0108 Arduino A Micro Controller Board Electronic Hobby Kit

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 pull ups which confuse auto-direction sensor). If you need to use pull ups, you can but they should be at least 50K ohm - the ones internal to AVRs/Arduino are about 100K ohm so those are OK! It’s 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!