Hi Chris, I am just watching this discussion from the sidelines, but what do you mean by dv/dt rating is 400V? dv/dt should have units of volts per second, shouldn't it? Sean At 10:21 PM 12/19/01 -0500, you wrote: >Double that on the 3051. 600 V Off state voltage - but the dv/dt is rated at >400V. Fairchild recommends using them up to 240V, but applying a 3:1 rating >rule of thumb, I use them up to 200V at 50 or 60 Hz, anxiety grows at 240. > >Chris ---------------------------------------------------- Sign Up for NetZero Platinum Today Only $9.95 per month! http://my.netzero.net/s/signup?r=platinum&refcd=PT97 -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics