power pad whine

[John Larkin]

OK, if you're going to stuff high-dissipation parts into absurdly
small packages, power pads are a good idea.

ftp://66.117.156.8/PowerPad2.jpg

(at least it's hard to bend the pins)

But why do only a tiny minority of datasheets mention what the pad is,
or isn't, electrically connected to?

John

 

[Spehro Pefhany]

OK, if you're going to stuff high-dissipation parts into absurdly
small packages, power pads are a good idea.

ftp://66.117.156.8/PowerPad2.jpg

(at least it's hard to bend the pins)

But why do only a tiny minority of datasheets mention what the pad is,
or isn't, electrically connected to?

John

That's one of those rhetorical questions, innit?

I'd guess it's going to be the substrate, if anything, but that and
two bucks will get you a cup of coffee.

Best regards,
Spehro Pefhany

 

[John Larkin]

That's one of those rhetorical questions, innit?

It was a whine.

I'd guess it's going to be the substrate, if anything, but that and
two bucks will get you a cup of coffee.

Seems like very roughly half are insulated, either by a di semi
process, or some sort of actual insulator. And the rest seem to be
mostly substrate, so must be floated or strapped to the most negative
chip supply. For the ungrounded cases, one must find a way to conduct
the heat out of the board from what may be a small pour.

A small latte is up to $2.75 here, but worth every devalued cent.

John

 

[WJLServo]

OK, if you're going to stuff high-dissipation parts into absurdly
small packages, power pads are a good idea.

ftp://66.117.156.8/PowerPad2.jpg

(at least it's hard to bend the pins)

But why do only a tiny minority of datasheets mention what the pad is,
or isn't, electrically connected to?

John

Call me paranoid; even if the vendor DOES spec slug connection, I do
an ommeter check....

W Letendre

 

[John Larkin]

Call me paranoid; even if the vendor DOES spec slug connection, I do
an ommeter check....

W Letendre

A fellow paranoic. I do, too.

John

 

[Ben Jackson]

If your power pad is whining perhaps there's a problem with your paste
mask. ;-)