HiLetgo 5pcs TXS0108E High Speed Full Duplex 8 Way 8 Channel Level Conversion Module 8-Bit 8 CH Logic Level Bi-Directional Converter Module

This device works well when it is properly configured!I use the device to step 3.3V micro controller output signals to 5 V when driving a MAX7219 seven-segment display.Like other reviewers, I suspect most of the negative reviews about this device not working are due to grounding the OE pin. The OE pin *MUST* be set to VA input voltage!One other concern is when using the device on a breadboard going from 3.3V to 5V, minimize the length of the VB output wires. I had cross talk issues using long breadboard leads. I suspect those amplified signal lead loops were acting like little radio transmitters, but when I ran direct, minimally short connection wires the MAX7219 display was rock solid.

This HiLetgo module pack is a lifesaver for projects involving different logic levels. The 8-channel bidirectional conversion allows seamless communication between 3.3V and 5V components. The five modules offer great value for multiple projects. While it might require some technical know-how for optimal use, it's a valuable tool for experienced electronics enthusiasts.

Limitation of the chip is that it suffers at long distance, this works well at short distances.5 of 5 chips worked fine, remember to V_A < V_B and connect OE to V_A.

If your signals are a bit noisy the edge accelerators in these chips will turn the noise into full blown high frequency pulses.

Overkill for most applications (bidirectional) but I handy tool to have around. This is just a breakout board for a TI chip that’s been around for a while. They work as the data sheet describes. I don’t find the data sheet confusing either. Their schematic shows OE tied low and being overdriven by a processor. That’s to ensure the outputs are off until you turn them on. If you don’t need to reset the device you can tie OE to the VA supply rail.

Voltage conversion 3.3V to 5V worked fine, but 5V output became unstable and noisy when trying to drive a 3 ft long twisted shielded pair cable to another board. I realize these are logic drivers and not line drivers, but we tried to use them that way anyway and it didn't work out well.

Only negative is the HiLetgo board doesn't have gold plated pads or square pins, but that can be excused at this price. The TXS0108E level converter is fantastic! If it doesn't work it's probably because you read the instructions here to connect OE to ground. OE needs to be connected to VA, as others have pointed out.I connected from an output on a SAMD21 microcontroller running at 3.6v directly to this part (and a 10x scope probe) and the high (B) side runs at 5 volts connected to an input pin on an AVR microcontroller. About 4" of wire was used for interconnect. The attached scope screen capture shows maybe 1ns at most insertion loss. (note- bottom trace is input, top trace is output). The reason? Well the microcontroller output has a rise time of 11ns which is squared up to a rise time of 6ns in the level converter! This almost makes up for the delay of the part.To put this in perspective, level converters available here that use MOSFET transistors and offer no gain nor have active pullup capability have more than 600ns delay which can make them useless for connecting high speed peripherals. Not so with this part!

At first I thought these were not working because they're TI knockoffs, and while I think that's true I ultimately had the same failure trying to drive a strip of WS2811 using TI branded TXS0108E as well. Per the datasheet this chip can fail to drive highly capacitive loads and I suspect that is the real reason it seems to work so randomly person to person. I was able to get it working adding a Schmitt trigger on the output, CD40106B, which at least proves that the chip works. If you also have a similar use case though, note that the Schmitt trigger alone can do the job.