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Subject:	Re: [geda-help] Thermal pad
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References:	<564F4722 DOT 5080406 AT videotron DOT ca>
	<201511201813 DOT tAKIDO8l012486 AT envy DOT delorie DOT com>
From:	"Ian Chapman (ichapman AT videotron DOT ca) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>
Message-id:	<565E42FD.2030001@videotron.ca>
Date:	Tue, 01 Dec 2015 20:01:49 -0500
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On 11/20/15 13:13, DJ Delorie wrote:
>>       Before I run into any unnecessary difficulties in layout I'd better
>> ask the experts.  It's a DDA package, an SO8 with a thermal pad.  It was
>> simple to add a pin  9 as a square pad inside the pins.  My question is
>> what is the best way to add half a dozen vias to the pad that connect
>> electrically and thermally to the ground plane below?  Regards Ian.
> Add them as pins (all numbered 9) and set the thermal flags in the
> footprint accordingly.  You can also fiddle with the nopaste (I think)
> flag and add smt pads (also numbered 9) to pattern your paste
> accordingly.
>
Thanks DJ that was great.  My footprint is below and I use the thermal 
tool in pcb layout to make the thermal/electrical connection.
SO8pwr.fp
Element[0x0 "SOIC-127P-600L1-8N" "" "" 0 0 -2350 -15850 0 100 0x0]
(
    Pad[-12600 -7500 -6300 -7500    2400 1400 2900 "" "1" 0x0100]
    Pad[-12600 -2500 -6300 -2500    2400 1400 2900 "" "2" 0x0100]
    Pad[-12600  2500 -6300  2500    2400 1400 2900 "" "3" 0x0100]
    Pad[-12600  7500 -6300  7500    2400 1400 2900 "" "4" 0x0100]
    Pad[  6300  7500 12600  7500    2400 1400 2900 "" "5" 0x0100]
    Pad[  6300  2500 12600  2500    2400 1400 2900 "" "6" 0x0100]
    Pad[  6300 -2500 12600 -2500    2400 1400 2900 "" "7" 0x0100]
    Pad[  6300 -7500 12600 -7500    2400 1400 2900 "" "8" 0x0100]
    Pad[     0  1134     0 -1134    7000 1400 8000 "" "9" 0x0100]

    Pin[     0 -2500  2000  1000    1000 1500 "" "9" 0x0001]
    Pin[  2500 -2500  2000  1000    1000 1500 "" "9" 0x0001]
    Pin[ -2500 -2500  2000  1000    1000 1500 "" "9" 0x0001]

    Pin[     0     0  2000  1000    1000 1500 "" "9" 0x0001]
    Pin[  2500     0  2000  1000    1000 1500 "" "9" 0x0001]
    Pin[ -2500     0  2000  1000    1000 1500 "" "9" 0x0001]

    Pin[     0  2500  2000  1000    1000 1500 "" "9" 0x0001]
    Pin[  2500  2500  2000  1000    1000 1500 "" "9" 0x0001]
    Pin[ -2500  2500  2000  1000    1000 1500 "" "9" 0x0001]

    ElementLine[-3100 -2200 -3100 -6250 1000]
    ElementLine[-3100 -6250 500 -9850 1000]
    ElementLine[500 -9850 3100 -9850 1000]
    ElementLine[3100 -9850 3100 -2200 1000]
    ElementLine[-3100 2200 -3100 9850 1000]
    ElementLine[-3100 9850 3100 9850 1000]
    ElementLine[3100 9850 3100 2200 1000]
)

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