HiLetgo 3pcs SN65HVD230 CAN Bus Transceiver Communication Thermal Protection Slope Control Module for Arduino Controller Board

I tried testing CAN with an eval board and one of these CAN PHY's before, and thought it was me. Then I got CAN working on production-hardware and it's solid. I tried to test again with these PHY's and it didn't work. I wired up board 2, dead, board 3, dead, all dead. Fortunately they don't seem to have a short across VCC/GND and don't pull too much current from/to TX/RX pins from the CPU. The receive side on all 3 boards is broken. The CPU side (CRX) drives a 3-state signal instead of a digital waveform. 0~800mv~1.5v with a bunch of analog noise instead of a solid 3.3v high/low.I'm attaching an image of what can be seen on the CRX pin.They are cheap for a reason. Sometimes I buy a 3-pack assuming 1 or two will be dead for this kind of price, but not this time, all boards were dead.DO NOT BUY.

I had a Waveshare SN65HVD230 that worked great but I blew it up after squeezing it in a small case, shorted 12v to the 3.3 pin. POOF!SO I ordered this, and they are supposed to be the same, but they all are junk! All three receive can messages, but they dont sent anything at all! The ESP32 does sense that it is there, as it will error without it connected, but I cant send any can messages from these. DO NOT BUY. I wasted an entire day messing with these things.

This is a pretty simple device in principle and the datasheet for the chip on this board is very clear about how it should behave. For whatever reason this board didn't reflect the expected behavior. Despite all my attempts I was never able to see a transmission on my scope. Eventually, I was not only successful with a different transceiver board, but an I2C to CAN interface board as well. Unless someone can demonstrate a working test bench I recommend looking elsewhere for a transceiver.

I bought a pack of these and we were able to get the receive side to work but not the transmit - on all three parts.We flipped the transceiver chip out with a new SN65HVD230 from DigiKey - and they worked just fine.Someone got some bad parts from the grey market and is trying to pass them off. These won't work. You can't even just use them for receive since all CAN devices need to be able to ACK the messages on a bus.Stay away!

Two out of three were DOA and the third consistently had errors. Replaced these with another brand and had no problems.