Post by thread:[PICLIST] [EE] 0805 underpass, handsoldering

Looks like I am going to be forced by the demise of 1206 caps to put underpasses under 0805s, which I have always avoided. Anyone doing this with handsoldering? What width trace width/clearance to 0805 pads works for you? Stuart -- http://www.piclist.com hint: To leave the PICList spam_OUTpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

Stuart, I put runs under 0805 components all the time. I typically use .008" spacing and .008" trace width. I have never had a problem with this, however, be careful about passing clocks and power under components. For that matter any trace that may be sensitive to noise, you will not want to pass under a component. Not knowing how much EMI/RFI that certain components my radiate can leave you in a bad way. Just use the same rules as in basic layout techniques, and keep the distance on critical traces to max. Gordon Varney http://www.iamnee.com > Looks like I am going to be forced by the demise of 1206 caps to put > underpasses under 0805s, which I have always avoided. > > Anyone doing this with handsoldering? What width trace width/clearance > to 0805 pads works for you? > > Stuart > > -- http://www.piclist.com hint: To leave the PICList .....piclist-unsubscribe-requestKILLspam@spam@mitvma.mit.edu

>Looks like I am going to be forced by the demise of 1206 caps to put >underpasses under 0805s, which I have always avoided. > >Anyone doing this with handsoldering? What width trace width/clearance >to 0805 pads works for you? imho invest in a solder mask (repair) pen (very narrow type) to mask the trace going under. Better have the board house mask the board properly from start. The trace under a 0805 is usually 5 mils or 3 mils. The clearance is as much as is left after that ;-). hope this helps, Peter -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads