I am crossing the following part, this is the closest I can find to a suitable sub. Fairchild FDS8858CZ, the only thing I see that is different is that this part has 2 zener diodes between the source and gate. This part seems exceeds my requirements, but of course I could be missing something. Using two different manufactures data sheets, some things are listed on one and not the other. Thanks http://www.alldatasheet.com/datasheet-pdf/pdf/289463/A-POWER/AP4503AGM.html? http://www.fairchildsemi.com/ds/FD/FDS8858CZ.pdf Hope the links work.