Hi,
I�m making the layout for a PCB that uses a triac in TO-220 package. The maximum current in the triac (BTA312Y) is 8 Amp. and the copper thickness 35�m (1 oz/ft2). What track width would you recommend? I�ve seen calculators on the Internet but they ask the allowable temperature rise and I don�t know what value I can choose. On the other hand, I�ve seen that IPC recommends 220mil for 8 Amp., 10�C rise and 1oz/ft2 Cu but it�s very big?
What value do you use for track clearance for 220V mains voltages? I�ve seen 0.75mm (http://www.electronics-project-design.com/PCB-Design.html ) for coated board. But here (http://www.smpspowersupply.com/ipc2221pcbclearance.html ) the values are not the same and I don�t know what to use? Is bare board for PCB without parts on it? So do I have to use assembly and �external components leads, uncoated� if : the board has a solder resist mask, is populated and if there is no coating on component leads?
Is the clearance also needed between the component�s pads (external diameter to external diameter)? If so, is it possible with a standard TO-220 package?
Thank you.
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