Have there been any issues with bad lots of MC33879 Octal Hi/Low Driver Chips? I have one date code that seems to be failing at a high level. Are there resources to check these date codes or see if maybe they are counterfeit chips?
Alternatively from a design perspective, is there any problems running with Vdd (logic 5V) powered and Vpwr (pwr 24V) unpowered for long periods of time? I could not see anything in the data sheets to say this would be an issues. I doubt this is the issue, because all the failed chips have the same date code, and others outside the date code have not been an issue.
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Hi
No problem application about VDD power up then unpower Vpwr.
Suggest you do FA about your issue deivce from your purchase channel.
Hi
No problem application about VDD power up then unpower Vpwr.
Suggest you do FA about your issue deivce from your purchase channel.
Thank you very much for the confirmation about VDD and VPWR. I will follow up with the supplier.