I expect there's a footnote in the datasheet something like this:

5A for <300uS
Duty cycle <2%

Pretty much all power SMD parts are seriously dissipation limited.

 :(

Best regards, Bob

On Mon, Jul 28, 2014, at 09:02 AM, Neil wrote:
> Which is why it baffles me that they have an SMD version that can=20
> allegedly handle 5A.  I do have a 2 sq-in pad on the board to dissipate=20
> heat, but it's no where near enough.
>=20
> Cheers,
> -Neil.
>=20
>=20
> On 7/28/2014 8:01 AM, paulduffy@comcast.net wrote:
> > Hi
> >   =20
> > The key will be using the TO220 package and having adequate heat sinkin=
g for the application.  Junction to case thermal resistance is lowest for t=
he TO220 variant, about 3 C/W.  I have done some modules with power drivers=
 disipating heat through the PCB and into a cast aluminum heat sink with th=
ermal paste between the PCB and heatsink.
> > Best Regards,
> >   =20
> > Paul

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