On 6/19/06, Russell McMahon wrote: > Anyone here having current problems with ROHS lead free systems? > > There were various prior tales of woe or predictions of disaster > including > > - Whisker growth > > - Bad solderability It is said that some varistors have problems. > This is a non-mains application. Regulatory clearances do not apply. Is this really true? At least functional insulation should apply... If you go for protection class II, then double insulation or reinforced insulation will be necessary. > Voltages are up to about > > - 150 VDC between TO220 0.1" pitch pads 0.1" = 2.54mm, should be okay. > - About 300v peak-peak AC (trapezoidal waveform) between 0.156" pitch > connector pads. Should be okay. I know that EN50178 will require about 0.5mm plus tolerance. UL508/UL840 will be similar (remember it is about 0.56mm for 250V AC). These standards may not really apply to your product but it can be a good guideline. However if you have different circuits in the same unit, then the requirement will be higher. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist