topic Question on Failing MC33879 in Power Management https://community.nxp.com/t5/Power-Management/Question-on-Failing-MC33879/m-p/1008018#M767 <HTML><HEAD></HEAD><BODY><P>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?</P><P></P><P>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.</P></BODY></HTML> Fri, 20 Dec 2019 16:26:36 GMT dkark 2019-12-20T16:26:36Z Question on Failing MC33879 https://community.nxp.com/t5/Power-Management/Question-on-Failing-MC33879/m-p/1008018#M767 <HTML><HEAD></HEAD><BODY><P>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?</P><P></P><P>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.</P></BODY></HTML> Fri, 20 Dec 2019 16:26:36 GMT https://community.nxp.com/t5/Power-Management/Question-on-Failing-MC33879/m-p/1008018#M767 dkark 2019-12-20T16:26:36Z Re: Question on Failing MC33879 https://community.nxp.com/t5/Power-Management/Question-on-Failing-MC33879/m-p/1008019#M768 <HTML><HEAD></HEAD><BODY><P>Hi</P><P>No problem application about VDD power up then unpower Vpwr.</P><P>Suggest you do FA about your issue deivce from your purchase channel.</P></BODY></HTML> Mon, 06 Jan 2020 07:50:23 GMT https://community.nxp.com/t5/Power-Management/Question-on-Failing-MC33879/m-p/1008019#M768 guoweisun 2020-01-06T07:50:23Z Re: Question on Failing MC33879 https://community.nxp.com/t5/Power-Management/Question-on-Failing-MC33879/m-p/1008020#M769 <HTML><HEAD></HEAD><BODY><P>Thank you very much for the confirmation about VDD and VPWR. I will follow up with the supplier. </P></BODY></HTML> Mon, 06 Jan 2020 15:29:16 GMT https://community.nxp.com/t5/Power-Management/Question-on-Failing-MC33879/m-p/1008020#M769 dkark 2020-01-06T15:29:16Z